headshot of Jhalendra Rijal with light background

Jhalendra P Rijal

Area Integrated Pest Management Advisor & UCIPM's Associate Director of Agricultural IPM

Ph.D. Entomology, Virginia Tech. 2014
M.S. Entomology, Tribhuvan University Nepal. 2006
B.S. Agriculture, Tribhuvan University Nepal. 2004

-Integrated Pest Management (IPM)
-Invasive and emerging arthropod pests & interactions with the environment
-Interdisciplinary collaborations
-Extension education and outreach
-Leadership in statewide IPM programs & activities

Dr. Jhalendra Rijal is a Cooperative Extension Integrated Pest Management (IPM) Advisor with the University of California Agriculture and Natural Resources (UC ANR). Based in the northern San Joaquin Valley, he leads applied research on insect pests of tree nuts and fruits and works closely with growers, pest control professionals, and industry stakeholders to develop and advance sustainable pest management practices.

His research focuses on pest biology and ecology, innovative monitoring tools, and behavioral, biological, cultural, and other IPM-based strategies for specialty crops. His work addresses both invasive and established pests, including brown marmorated stink bug (BMSB), spotted wing drosophila (SWD), Carpophilus beetle, navel orangeworm, plant bugs and stink bugs, walnut husk fly, Pacific flatheaded borer, and beet leafhopper.

Before joining UC Cooperative Extension, Rijal was a Postdoctoral Scholar at UC Davis, where he developed IPM strategies for peppermint and cool-season vegetables targeting mint root borer, spider mites, and Bagrada bug. He earned his Ph.D. in Entomology from Virginia Tech, where his research focused on the spatial distribution, risk factors, and food-finding behavior of grape root borer in vineyards.

Rijal has led numerous applied research projects, published extensively, and is recognized for developing grower-driven, science-based IPM solutions for California’s nut and fruit industries. Rijal’s work has been widely recognized with student, professional, and institutional honors, including the Friends of IPM regional award from Southern Regional IPM for his doctoral research, the Virginia Tech Entomology Outstanding Recent Graduate Alumni award, multiple Entomology/IPM Team awards, and a national academic excellence award from the President of Nepal for his master’s studies.

In addition to his research and extension responsibilities, Rijal provides statewide leadership in pest management. He serves as Associate Director of the UC Statewide Integrated Pest Management Program and Program Area Chair for UC ANR’s Integrated Pest Management Program Area, where he helps coordinate statewide IPM priorities, strengthen collaboration, and advance science-based IPM research, extension, and outreach.

Awards

  • 2025: Entomology Outstanding Recent Graduate Alumni Award, Virginia Tech
  • 2020: Integrated Pest Management Team Award, Plant-Insect Ecosystem (PI-E) Section, Entomological Soc. Am.
  • 2020: Entomology Team Work Award, Entomological Soc. Am. Pacific Branch
  • 2020: IPM Achievement Award (Team Award), CA Dept. of Pesticide Regulation
  • 2019: UC Entomology Extension Award (Team Award), Western Extension Directors Association Award of Excellence
  • 2014: Honor for outstanding leadership, Society of Overseas Nepalese Entomologists (SONE)
  • 2014: Friends of IPM Graduate Student (Ph.D.) Award, Southern IPM Center ($3000)
  • 2012: President’s Prize Award, 60th ESA-annual meeting, Knoxville, TN
  • 2012: Cyrus McCormick Scholarship, Virginia Tech ($1500)
  • 2012: Sigma-Xi Ph.D. Research Grant ($2000)
  • 2011: Entomological Society of America-SYP Award 
  • 2009: Chancellor Gold Medal, Tribhuvan University
  • 2009: Ram Prasad Manandhar Gold Medal, Tribhuvan University
  • 2008: Nepal Vidya Bhushan Award (Received from the President of Nepal)

Peer-reviewed Publications

2026

Shilman, M. M., Davis, T. Z., Gee, W., Henderson, T., Gomez, J., Kim, J. H., Chan, K. L., et al. (2026). A five-component plant-derived pesticide blend targeting insect pests, fungal pathogens, and mycotoxin contamination in tree nuts. ACS Agricultural Science & Technology, 6(7), 1368–1379.

Callahan, P., Rijal, J., Gyawaly, S., Gonzalez, F., & Joyce, A. (2026). Hemiptera diversity using the mtDNA COI barcode in almond orchards in the Northern San Joaquin Valley of California. Journal of Economic Entomology, toag123.

Rijal, J. P., Sakaki, S., Gyawaly, S., & Addesso, K. (2026). Optimizing trap design, lure, and color for monitoring Chrysobothris mali (Coleoptera: Buprestidae) in California walnut orchards. Environmental Entomology, 55(2), nvag033.

Achhami, B. B., & Rijal, J. P. (2026). Comparing brown mite, Bryobia rubrioculus Scheuten (Acari: Tetranychidae), sampling methods in almond orchards in California. Experimental and Applied Acarology, 96(2), 24.

2024-2025

Takata, M., Gyawaly, S., Rijal, J. P., Van Steenwyk, R., & Kahl, H. (2025). Biology, ecology, and management of walnut husk fly (Diptera: Tephritidae). Journal of Integrated Pest Management, 16(1), pmaf043. https://doi.org/10.1093/jipm/pmaf043

Bansal, R., Rijal, J. P., Haviland, D. R., Gyawaly, S., & Wilson, H. (2025). A low cost and labor-efficient method for rearing an invasive beetle, Carpophilus truncatus (Coleoptera: Nitidulidae). Journal of Economic Entomology, toae290. https://doi.org/10.1093/jee/toae290

Rijal, J. P., & Gyawaly, S. (2025). Efficacy and persistence of the entomopathogenic fungi and nematodes on walnut husk fly (Rhagoletis completa) in California. Acta Horticulturae, 1420, 267–274. https://doi.org/10.17660/ActaHortic.2025.1420.36

Gyawaly, S., & Rijal, J. P. (2025). Understanding emergence phenology and developing monitoring tools for Pacific flatheaded borer in walnut orchards in California. Acta Horticulturae, 1420, 319–326. https://doi.org/10.17660/ActaHortic.2025.1420.41

Rijal, J. P., & Schellman, A. (2025). UC IPM Pest Notes: Squash bugs (UC ANR Publication 74144). University of California Agriculture and Natural Resources.

Van Steenwyk, R. A., Walse, S. S., Kuzmich, D., Thayer, M. R., & Rijal, J. P. (2025). Preliminary findings on the improved monitoring of walnut husk fly (Rhagoletis completa) through a new pheromone lure. Acta Horticulturae, 1420, 309–318. https://doi.org/10.17660/ActaHortic.2025.1420.40

Ikendi, S., Pinzón, N., Koundinya, V., Taku-Forchu, N., Roche, L. M., Ostoja, S. M., Parker, L. E., Zaccaria, D., Cooper, M. H., Diaz-Ramirez, H. N., Brodt, S., Battany, M., Rijal, J. P., & Pathak, T. B. (2024). Climate-smart agriculture: Assessing needs and perceptions of California's farmers. Frontiers in Sustainable Food Systems, 8, 1395547.

Rijal, J. P., Bansal, R., & Gyawaly, S. (2024). Edge effects of invasive brown marmorated stink bug, Halyomorpha halys, infestation, and damage in almond orchards. Acta Horticulturae, 1406, 367–376. https://doi.org/10.17660/ActaHortic.2024.1406.52

Rijal, J. P. (2024). Brown marmorated stink bug UCIPM guidelines. In J. K. Hasey, K. R. Day, J. P. Rijal, & K. E. Tollerup, UC IPM Pest Management Guidelines: Peach (UC ANR Publication 3454). University of California Agriculture and Natural Resources.

Gyawaly, S., & Rijal, J. P. (2024). Effect of winter flooding on navel orangeworm and spider mites in almond orchard. Acta Horticulturae, 1406, 395–402. https://doi.org/10.17660/ActaHortic.2024.1406.56

Day, K. R., Tollerup, K. E., Duncan, R. A., Rijal, J. P., Roncoroni, J. A., Westerdahl, B. B., Adaskaveg, J. E., Hasey, J. K., & Wright, S. D. (2024). UC IPM Pest Management Guidelines: Peach (UC ANR Publication 3454). University of California Agriculture and Natural Resources.

2022–2023

Jha, P. K., Zhang, N., Rijal, J. P., Parker, L. E., Ostoja, S., & Pathak, T. B. (2023). Climate change impacts on insect pests for high value specialty crops in California. Science of the Total Environment, 906, 167605.

Rijal, J. P. (2022). Spotted wing drosophila UCIPM guidelines. In J. A. Grant, J. L. Caprile, W. W. Coates, R. A. Van Steenwyk, K. M. Daane, & J. P. Rijal, UC IPM Pest Management Guidelines: Cherry (UC ANR Publication 3440). University of California Agriculture and Natural Resources.

Illán, J. G., et al., & Rijal, J. P. (2022). Evaluating invasion risk and population dynamics of the brown marmorated stink bug across the contiguous United States. Pest Management Science.

Gyawaly, S., & Rijal, J. P. (2022). Neem-based insecticides deter oviposition activity in spotted wing drosophila (Diptera: Drosophilidae) in sweet cherries. Journal of Economic Entomology.

Nepal, A., DeShields, J. B., Levin, A. D., Hilton, R., & Rijal, J. P. (2022). Epidemiology of grapevine red blotch disease progression in southern Oregon vineyards. American Journal of Enology and Viticulture, 73, 116–124.

2018-2021

Rijal, J. P., Joyce, A. L., & Gyawaly, S. (2021). Biology, ecology, and management of hemipteran pests in almond orchard systems in the United States. Journal of Integrated Pest Management, 12(1), 24.

Gireesh, M., Rijal, J. P., & Joseph, S. V. (2021). Spatial distribution of hunting billbugs (Coleoptera: Curculionidae) in sod farms. Insects, 12(5), 402.

Gyawaly, S., Rijal, J. P., & Joseph, S. V. (2021). Bagrada hilaris (Bagrada bug or painted bug). In CABI Invasive Species Compendium. CAB International.

Haviland, D. R., Rijal, J. P., Rill, S. M., Higbee, B. S., Burks, C. S., & Gordon, C. A. (2021). Management of navel orangeworm (Lepidoptera: Pyralidae) using four commercial mating disruption systems in California almonds. Journal of Economic Entomology.

Fisher, J. J., Rijal, J. P., & Zalom, F. G. (2021). Temperature and humidity interact to influence brown marmorated stink bug (Hemiptera: Pentatomidae) survival. Environmental Entomology, 50(2), 390–398.

Pathak, T. B., Rijal, J. P., & Maskey, M. (2021). Impact of climate change on navel orangeworm, a major pest of tree nuts in California. Science of the Total Environment. 

Shrestha, G., Rijal, J. P., & Reddy, G. (2020). Characterization of the spatial distribution of alfalfa weevil, Hypera postica, and its natural enemies, using geospatial models. Pest Management Science.

Rijal, J. P., & Zalom, F. G. (2020). Provisional guidelines for brown marmorated stink bug control in almond. UC IPM.

Fisher, J., Rijal, J. P., & Zalom, F. G. (2020). Temperature and humidity interact to influence brown marmorated stink bug, Halyomorpha halys (Hemiptera: Pentatomidae), survival. Environmental Entomology.

Joseph, S. V., & Rijal, J. P. (2019). Walking capacity of Lygus hesperus (Hemiptera: Miridae) fifth instars in the laboratory and outdoors. Southwestern Entomologist, 44(2), 403–408.

Rijal, J. P., & Gyawaly, S. (2018). Characterizing brown marmorated stink bug injury in almond, a new host crop in California. Insects, 9(4), 126. https://doi.org/10.3390/insects9040126

Baspinar, H., Doll, D., & Rijal, J. P. (2018). Pest management in organic almonds. In V. Vacante & S. Kreiter (Eds.), The handbook of pest management in organic farming (pp. 328–347).

Rijal, J. P., Regmi, R., Ghimire, R., Puri, K. D., Gyawaly, S., & Poudel, S. (2018). Farmers’ knowledge on pesticide safety and pest management practices: A case study of vegetable growers in Chitwan, Nepal. Agriculture, 8, 16.

Rijal, J. P., & Godfrey, L. D. (2018). Efficacy of selected bio- and reduced-risk insecticides on mint root borer. Arthropod Management Tests, 43(1), tsx134.

2013–2017

Rijal, J. P., & Duncan, R. (2017). First report of an established brown marmorated stink bug (Hemiptera: Pentatomidae) population in California agricultural crops. Journal of Entomological Science, 52(4), 450–454.

Rijal, J. P., & Bergh, J. C. (2017). Grape root borer (Lepidoptera: Sesiidae): An economic pest of commercial vineyards in the eastern United States. Journal of Integrated Pest Management. https://doi.org/10.1093/jipm/pmx027

Rijal, J. P., Wilson, R., & Godfrey, L. D. (2016). Characterization of spatial distribution of Tetranychus urticae in peppermint in California and implication for improving sampling plan. Experimental and Applied Acarology, 68, 155–171.

Rijal, J. P., & Bergh, J. C. (2016). Food-finding capability of grape root borer (Lepidoptera: Sesiidae) neonates in soil column bioassays. Journal of Entomological Science, 51, 54–68.

Rijal, J. P., Brewster, C. C., & Bergh, J. C. (2014). Effects of biotic and abiotic factors on grape root borer (Lepidoptera: Sesiidae) infestations in commercial vineyards in Virginia. Environmental Entomology, 43, 1198–1208.

Rijal, J. P., Brewster, C. C., & Bergh, J. C. (2014). Spatial distribution of grape root borer (Lepidoptera: Sesiidae) infestations in Virginia vineyards and implications for sampling. Environmental Entomology, 43, 716–728.

Gresham, S. D., Rijal, J. P., Vieira, L. C., & Bova, J. (2014). What is the best individual solution to meeting the world’s growing energy demand? Solar energy technologies [ESA Student Debate–2012]. In J. L. Peterson & C. Minteer (Eds.), Student’s perspectives on scientific tools to solve global issues. American Entomologist, 60, 212–222.

Rijal, J. P., Zhang, A., & Bergh, J. C. (2013). Behavioral response of grape root borer (Lepidoptera: Sesiidae) neonates to grape root volatiles. Environmental Entomology, 42, 1338–1347.

2006–2009

Subedi, S., GC, Y. D., Thapa, R. B., & Rijal, J. P. (2009). Rice weevil (Sitophilus oryzae L.) host preference of selected stored grains in Chitwan, Nepal. Journal of the Institute of Agriculture and Animal Science, 30, 151–158.

Rijal, J. P., GC, Y. D., Thapa, R. B., & Kafle, L. N. (2008). Virulence of native isolates of Metarhizium anisopliae and Beauveria bassiana against Helicoverpa armigera in Nepal. Formosan Entomologist, 28, 21–29.

Rijal, J. P., GC, Y. D., Thapa, R. B., & Kafle, L. N. (2008). Comparative efficacy of insect pathogenic fungi (Metarhizium anisopliae and Beauveria bassiana) to Helicoverpa armigera in chickpea under field condition of Nepal. Formosan Entomologist, 28, 249–258.

Rijal, J. P., GC, Y. D., & Thapa, R. B. (2008). Yield loss assessment and monitoring of Helicoverpa armigera Hübner in chickpea under Chitwan condition. Journal of Plant Protection Society of Nepal, 1, 90–98.

Rawat, P. R., GC, Y. D., Thapa, R. B., & Rijal, J. P. (2008). Evaluation of entomopathogenic fungi with other pesticides against mustard aphid, Lipaphis erysimi (Kalt.), under field condition of Chitwan, Nepal. In Proceedings of Workshop of Plant Protection Society of Nepal, July 25–26, 2008, Kathmandu, Nepal.

Rijal, J. P., Malla, R. K., Tiwari, S., Rawat, P. R., & GC, Y. D. (2006). A preliminary study on the practices of insect pest management at Sukranagar VDC, Chitwan. In G. K. KC, S. Pokhrel, N. S. Upadhaya, S. P. Marahatta, & B. D. Bhandari (Eds.), Proceedings of a National Workshop on Integrated Pest Management (pp. 297–307). Plant Protection Society of Nepal.

Extension Publications

  1. Rijal, J.P. and S. Sakaki (2025). Yellow triangular trap is the most effective for monitoring Pacific flatheaded borer in walnuts. Progressive Crop Consultant. July/August Issue. pp. 12-15.
  2. Rijal, J.P. and L. Milliron (2025). Walnut spring orchard tasks. Pacific Nut Producer. Vol. 31, No. 4 (April). pp. 20-21.
  3. Rijal, J.P. (2025). Almond orchard tasks for spring. Pacific Nut Producer. Vol. 31, No. 3 (March). pp. 10-13.
  4. Rijal, J.P. (2024). Post-season thoughts on almond insect pests. The Scoop of the Fruit and Nuts. UCCE Stanislaus, Fall 2024, Vol. 29, Issue 2.
  5. Rijal, J. P., M. Ghimire, H. Wilson, S. Gyawaly, and D. Haviland. (2024). A visual guide to differentiate invasive carpophilus beetle (Carpophilus truncatus) and navel orangeworm (Amyelois transitella) and their damage in almonds. UC Statewide IPM Project Extension Publication. UCANR, Summer 2024.
  6. Sakaki, S., and Rijal, J.P. (2024). Developing monitoring traps for flatheaded borer in walnuts. The Scoop of the Fruit and Nuts. UCCE Stanislaus, Fall 2024, Vol. 29, Issue
  7. Haviland, D., H. Wilson and J. Rijal. 2024. A new invasive pest of tree nuts in California. Pacific Nut Producer, January 2024, p. 8-13.
  8. Wilson, H., J. P. Rijal and D. Haviland. (2024)  Ecology, monitoring and management of carpophilus beetle: a new invasive pest of tree nuts in California. Progressive Crop Consultant, Jan/Feb 2024, JCS Marketing, p. 22-27.
  9. Rijal, J.P., and M. Ghimire. (2024). Invasive Carpophilus Beetle: How to Detect Its Infestation in Hull Split Almonds. Field Notes. UCCE San Joaquin, August 2024.
  10. Rijal, J. P. (2023). Tackling Pesticide Resistance of Spotted Wing Drosophila in Cherries. Progressive Crop Consultant, JCS Marketing, Inc. May/June Issue. pp. 32-34.
  11. Rijal, J.P. (2023). Spring Season Walnut Orchard Tasks-Pest Management. Pacific Nut Producer. April, 2023. pp 26-29.
  12. Gyawaly, S., and J.P. Rijal. (2023). Prioritizing Sprays When You Can’t Afford Them All. Sacramento Valley Orchards Source. https://www.sacvalleyorchards.com/blog/walnuts-blog/prioritizing-sprays-when-you-cant-afford-them-all/
  13. Wang, Z.; J. P. Rijal (2023). Monitoring beet leafhopper and beet curly top virus on processing tomatoes in California's northern San Joaquin Valley. HortScience. 58, S95-S96 (Abstract)
  14. Rijal, J.P., and R. Van Steenwyk. (2023). Growers Can’t Afford Losses to Walnut Husk Fly: Monitoring & Managing This Walnut Pest. Pacific Nut Producer, June 2023.
  15. Boyd, V., and J.P. Rijal. (2023). Borer insect’s appetite grows, damaging older trees. Ag Alert, 16 August, pp. 7-8.
  16. Eddy, D., and J.P. Rijal. (2023). Tackling the No. 1 Enemy for Almonds — Navel Orangeworm. American Fruit Growers, March, 2023.
  17. Nouri, M., and J. P. Rijal. (2023). Early Spring Walnut Pests - Monitoring and Management Considerations. Field Notes. UCCE San Joaquin. February, 2023.
  18. Eddy, D., and J.P. Rijal. (2023). Yes! Biosolutions Do Exist for Pest Issues in Walnuts. 18 April, 2023. https://www.growingproduce.com/fruits/yes-biosolutions-do-exist-for-pest-issues-in-walnuts/
  19. Rijal, J.P., and T. Charlston. (2023). 4/28/23 – MyAgLife Podcast Episode 167: on ‘True Bug’ Monitoring and Management in Spring, https://podcasters.spotify.com/pod/show/myaglife/episodes/42823---MyAgLife-Episode-167-RERUN-Interview-with-UCCEs-Jhalendra-Rijal-on-True-Bug-Monitoring-and-Management-in-Spring-e236kmi
  20. Rijal, J.P., and S. Gyawaly. (2023). Navel Orangeworm (NOW) Hull Split Spray Considerations 2023. The Scoop of the Fruit and Nuts. UCCE Stanislaus, Summer 2023, Vol. 28, Issue 1.
  21. Zuber, C., and J. P. Rijal. (2022). Winter Mummy Nut Sampling in Almond: Additional Insights for Pest Management. UCCE San Joaquin Valley Tree and Vines Blogs, 16 November. https://www.sjvtandv.com/blog/winter-mummy-nut-sampling-in-almond-additional-insights-for-pest-management
  22. Rijal, J. P., S. Gyawaly, T. Martin (2022). Flatheaded borer re-emerges as a damaging pest of walnut. IPM in Action Highlights. UC Statewide IPM Program. https://ipm.ucanr.edu/highlights/2021/flatheaded_borer_reemerges_as_a_damaging_pest_of_walnut/
  23. Rijal, J.P. (2022). Lilac Borer, Podosesia syringae (Harris), as a New Pest of Commercial Olives in California: Biology and Management. CAPCA Advisor, December 2022. pp 64-67.
  24. Vicky, B., J. Roseman, and J. P. Rijal. (2022). Neighborly NOW: Web portal connects neighboring nut growers to create larger blocks for NOW mating disruption. West Coast Nut. February 2023. https://www.wcngg.com/2023/02/01/neighborly-now/
  25. Gyawaly, S., and J.P. Rijal. (2022). In-season-& Post-harvest Management of Navel Orangeworm (NOW). October 2022. Sacramento Valley Orchard Source, https://www.sacvalleyorchards.com/blog/walnuts-blog/management-navel-orangeworm/
  26. Wang, Z., and J.P. Rijal (2022). Beet leafhopper and its vectored beet curly top virus on processing tomato: vector phenology, disease severity, and yield impact. CAPCA Adviser. 25:3, 40-45.
  27. Rijal, J.P. and M. Lies. (2022). BMSB on the Rise in Almonds. https://www.wcngg.com/2022/09/10/bmsb-on-the-rise-in-almonds/
  28. Rijal, J. P. (2022). Removal of Infested Branches Helps to Minimize Flatheaded Borer Damage in Walnuts. UCCE San Joaquin Valley Tree and Vines. 6 July. https://www.sjvtandv.com/blog/removal-of-infested-branches-helps-to-minimize-flatheaded-borer-damage-in-walnuts
  29. Rijal, J. P., and C. Burks. (2021). Navel orangeworm monitoring tools for orchards under mating disruption. The Scoop. UCCE Stanislaus. April Issue. Vol. 26.1.
  30. Haviland, D., and J. P. Rijal. (2021). Are ‘May Sprays’ a low-hanging fruit to cut almond costs in 2021? West Coast Nut. Published April 9. http://www.wcngg.com/2021/04/09/are-may-sprays-a-low-hanging-fruit-to-cut-almond-costs-in-2021/
  31. Coatney, K. and J.P. Rijal. (2021). Walnuts, navel orangeworm and ethephon for 2021. K. Coatney (Ed.). West Coast Nut. https://www.wcngg.com/2021/08/11/walnuts-navel-orangeworm-and-ethephon-for-2021/
  32. Wang, Z. and, J.P. Rijal (2021). High incidence of beet leafhopper vectored beet curly top disease on processing tomato. Progressive Crop Consultant. 6:6, 14-19.
  33. Green, J. and J. P. Rijal. (2021). Believe it or not: bugs like almonds too. Entomology Today, Entomological Society of America. Published June 17, https://entomologytoday.org/2021/06/17/true-bugs-almonds-pests-hemiptera-integrated-pest-management/
  34. Rijal, J.P. (2021). Resurgence of Pacific flatheaded borer in walnut orchards and ongoing research efforts. 2020 Stanislaus County Agricultural Report. pp. 24-25.
  35. Rijal, J.P. and T. Chalstrom. (2021). Managing stink bugs in almonds. My AgLife podcast. Published June 25. https://anchor.fm/myaglife/episodes/62521---MyAgLife-Episode-71-Interview-with-UCCEs-Jhalendra-Rijal-about-Managing-Stink-Bugs-in-Almond-e13d1ff
  36. Rijal, J.P. (2021). Brown marmorated stink bug (BMSB): identification and monitoring in almond orchards -Video. UC Statewide IPM Program. Published September. https://www.youtube.com/watch?v=fc2qv7YtaWU.
  37. Rijal, J.P. (2021). Walnut orchard tasks. Pacific Nut Producer. February Issue. pp. 42-47.
  38. Rijal, J. P., C. Burks, and H. Wilson (2021). Tackling the rising tide of navel orangeworm in walnuts. Orchard Origin Blog, California Walnut Board. Published January 6, 2021.
  39. Rijal, J. P., and S. Gyawaly (2021). Spring season pest monitoring activities in almond orchards. West Coast Nut. February Issue. pp. 24-31.
  40. Rijal, J. P., (2021). Removal of infested branches helps to minimize flatheaded borer damage in walnuts. The Scoop. UCCE Stanislaus, December 2020, Vol. 25.4.
  41. Rijal, J. P., T. Pathak, and P. Gordon. (2021). Climate change part 5: navel orangeworm. Growing the Valley Podcast. P. Gordon. Published September 7. https://www.growingthevalleypodcast.com/podcastfeed/2021/8/18/climate-change-part-5-navel-orangeworm
  42. Rijal, J. P., (2021). How Nut Growers Can Get the Best of Brown Marmorated Stink Bug. Growing Produce, April 21. https://www.growingproduce.com/nuts/how-nut-growers-can-get-the-best-of-brown-marmorated-stink-bug/
  43. Rijal, J.P. and T. Pathak. (2021). Potential effects of drought and climate change on insect pests including navel orangeworm. West Coast Nut. July Issue. pp 8-12.
  44. Rijal, J. P., and C. Burks. (2021). Navel orangeworm monitoring tools for orchards under mating disruption. The Scoop. UCCE Stanislaus. April Issue. Vol. 26.1.
  45. Rijal, J. P. 2020. IPM Task at Harvest: Identifying insect pest damage through harvest sampling. The Scoop Newsletter (July). https://bit.ly/37gaaoY
  46. Rijal, J. P. 2020. Reports of Lilac borer infestation in commercial olive orchards in North San Joaquin Valley. UCCE Field Notes Newsletter (May). https://bit.ly/37ha7cf
  47. Rijal, J. P. 2020. Walnut husk fly: understanding the biology, monitoring and management of this common pest in walnut. West Coast Nut. June Issue. pp. 46-48. https://bit.ly/3mkZPys
  48. Rijal, J. P. 2020. How Nut Growers Can Get the Best of Brown Marmorated Stink Bug. https://bit.ly/2JlMWFo
  49. Rijal, J. P. 2020. Managing spotted wing drosophila in blueberry and cherry orchards in California. UCCE San Joaquin Valley Tree & Vine Blog, https://bit.ly/3lfqKu6 (Apr. 16)
  50. Rijal, J. P., and S. Seybold. 2019. Pacific flatheaded borer as a resurgent pest of walnuts in California: background, questions, and future research needs. CAPCA Advisor, December, pp. 41-47.
  51. Rijal, J. P., 2019. Importance of Integrated Pest Management (IPM) in managing arthropod pests in organic nut production in California. Organic Farmer, Vol. 2, Issue 4. pp 44-46.
  52. Haviland, D.R., and J. P. Rijal. 2019. Mating disruption for navel orangeworm available for organic nut crops. Organic Farmer, October/November, pp 16-20.
  53. Rijal, J. P. 2019. Seasonal pest management task: insect monitoring in almond and walnut orchards. West Coast Nut. April Issue. pp. 10-17.
  54. Haviland, D., J. P. Rijal, E. Symmes. 2019. IPM Advisors demonstrate mating disruption for key almond pests. UC Delivers. Published: June 28, 2019. https://bit.ly/3lgF8lL
  55. Rijal, J. P. 2019. Insect Pest Updates (3/1, 3/23, 4/12, 4/25, 6/1, 6/15, 7/15) on the AgFax Tree Crops Updates.
  56. Parsons, C. and J. P. Rijal. 2019. Almond and pistachio growers need to be on the lookout for BMSB. West Coast Nut. February Issue. Pp 38-41.
  57. Rijal, J.P. 2019. California Almonds, Walnuts: Trapping Options – Quick Overview. AgFax News (March 3), er 19).
  58. Rijal, J. P. 2019. Where does the husk fly go during the winter: exploring the overwintering biology of the walnut husk fly in walnuts. CAPCA Adviser (February)
  59. Rijal, J. P. 2019. Invasive pests to watch out for in the vines in 2019. A special newsletter issue published for the 67th Annual Grape Day. Lodi Grape Growers and Lodi Wine Commission (February).
  60. Rijal, J. P. 2018. Brown marmorated stink bug-keep an eye out for potential damage. Sacramento Valley Orchard Source. https://goo.gl/4RNeyd.
  61. Rijal, J.P. 2018. California Walnuts: “Concerning” – Pacific Flatheaded Borer Activity. AgFax News (November 19). 
  62. Rijal, J. P. 2018. Old pest-new problem: Infestation of pacific flatheaded borer in walnuts in the northern San Joaquin Valley. Field Notes Newsletter (November).
  63. Rijal, J. P. (2018). Understanding the Overwintering Biology of the Husk Fly—A Research Update. Field Notes Newsletter (August).
  64. Rijal, J. P. (2018). California almonds: what to expect from third now flight in upper SJV. August 13,
  65. Rijal, J. P. (2018). New Pest of Almond: The knowns and unknowns of brown marmorated stink bug in California. Progressive Crop Consultant (July/August).
  66. Martin, T., and P. Rijal. (2018). Brown marmorated stink bug moving into agriculture. The IPM Corner Blog (June).
  67. Rijal, J. (2018). Mating disruption and navel orangeworm. UCCE Stanislaus Walnut News (Spring).
  68. Rijal, J. P., and D. Haviland. (2018). Integration of mating disruption into management programs for navel orangeworm. West Coast Nut (June).
  69. Burks, C., E. Symmes, and P. Rijal. (2018). Monitoring and treatment of navel orangeworm (NOW) in walnuts: research update. Progressive Crop Consultant (March/April).
  70. Rijal, J. P. (2018). Insect pest monitoring for tree crops (Bloom-Spring). Field Notes Newsletter (February).
  71. Haviland, D., E. Symmes, P. Rijal, and K. Tollerup. (2017). Evaluation of the role of chlorpyrifos in almond production systems. CAPCA Adviser (December).
  72. Rijal, J. P. (2017). Brown Marmorated Stink Bug Becomes Established in Stanislaus County Orchards. 2016-Stanislaus County Crop Report. 17p.
  73. Rijal, J. P. (2017). Mating disruption: An effective IPM tool for navel orangeworm. Progressive Crop Consultant. Vol. 2, Issue 3 (May-June), pp. 30-34.
  74. Rijal, J. P. (2017). Invasion of brown marmorated stink bug (BMSB): Orchard pest update-peach growers beware. Vol. 34 (September/October, Issue 4). pp. 8-11.
  75. Rijal, J. P., and R. Duncan. (2017). Brown marmorated stink bug spread to peach growing areas in the northern San Joaquin Valley. CAPCA Newsletter (August). pp. 32-35.
  76. Rijal, J. P. (2017). Updates on Brown Marmorated Stink Bug (BMSB) Monitoring-2017. Field Notes Newsletter (August).
  77. Rijal, J. P., and R. Duncan. (2017). Brown Marmorated Stink Bug Survey in Cling Peach Orchard. The IPM Corner (March).
  78. Rijal, J. P. (2017). Insect pest monitoring in almonds and walnuts. The IPM Corner (March).
  79. Rijal, J. P., and J. Caprile. (2017). San Jose scale and it's biological control activity in North San Joaquin Valley. Field Notes Newsletter (February).
  80. McGowen, S. (2016). A booklet on ‘Safe use and handling of pesticides for commercial vegetable growers in Nepal’ (Editor: Jhalendra Rijal). Horticulture Innovation Lab/CARD-Nepal
  81. Godfrey, L.D., S. V. Joseph, J. P. Rijal, I. Grettenberger. (2016). Bagrada bug moves into central and northern California. Bagrada Bug News, Issue I (March). California Certified Organic Farmers
  82. Rijal, J. P. (2016). Summary of insect monitoring in nut and fruit crops: summer update. The Scoop (of fruit and nuts in Stanislaus County). Vol 22.1 (July)
  83. Rijal, J. P. (2016). Research to better understand spider mite migration timing. Nuts 'n' Bolts section, Pacific Nut Producer Newsletter Vol. 22, No. 6 (June)
  84. Rijal, J. P. (2016). Research to better understand spider mite migration timing. Nuts 'n' Bolts section, Pacific Nut Producer Newsletter Vol. 22, No. 6 (June)
  85. Rijal, J. P. (2016). Sampling and management of spider mites in almonds. Pacific Nut Producer Newsletter Vol. 22, No. 6 (June)
  86. Rijal, J. P. (2016). Taking nut samples at harvest for insect damage evaluation. Field Notes Newsletter (August)
  87. Rijal, J. P. (2016). Spider mites in almonds: monitoring and management. Field Notes Newsletter (May)
  88. Rijal, J. P. (2016). Spotted Wing Drosophila in California Cherries: understanding the issue and options for management. California Fresh Fruit 33 (2): pp. 8-9.
  89. Rijal, J. P. (2016). IPM of Spider mites in almonds: exploring the new sampling techniques. CAPCA Adviser Vol. 19, No. 4 (August)
  90. Rijal, J.P. (2016). Brown Marmorated Stink Bug (BMSB) and its spread in California. Field Notes Newsletter, February.
  91. Rijal, J.P. (2016). Monitoring and management of San Jose scale and other insect pests during the dormant season. The Almond Doctor.
  92. Rijal, J. P. (2015). New IPM Advisor: an introduction. Field Notes Newsletter, August.
  93. Rijal, J. P. (2015). Obscure mealybug found on almond trees for the first time in California. Entomology Today, Entomol. Soc. Am.
  94. Rijal, J.P. (2015). Role of Winter Sanitation for Navel Orangeworm Management. The Almond Doctor
  95. Rijal, J. P. (2015). Spotted wing Drosophila in California cherries. Field Notes Newsletter-November.