Garden Troubleshooting

Four men in weedy area. One is holding a measuring container while another sprays liquid into it from a wand attached to a backpack sprayer. A third person holds a clipboard and the furth holds a stopwatch.
UC Weed Science (weed control, management, ecology, and minutia): Article

New Online Course: Calibrating Herbicide Applications for Non-Agricultural Areas

April 14, 2025
By Cheryl A Reynolds
Calibration might sound intimidating, but it’s critical for safe and effective herbicide application. Proper calibration ensures that the correct amount of pesticide is applied to an area while achieving the desired level of pest control. To support land managers and pesticide applicators, the UC Statewide…
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Thrips/TSWV status in Yolo & Colusa: Article

2025 First Report-- April 2

April 2, 2025
By Patricia A Lazicki
General situation, thrips population developmentPlanting is in full swing. Temperatures and precipitation this spring are close to historic norms, and the thrips population predictions are very similar to those we saw last year. We’re currently at the peak of 1st-generation adults; they’ll be laying their…
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Photo Forest and Lake by Katie Musial on Unsplash
ANR Contracts & Grants Updates: Article

2 RFPs - Vertebrate Pest Control Research and Forest Monitoring

March 27, 2025
By Kendra T Rose
Dear Colleagues,1) California Department of Food and Agriculture’s (CDFA) Integrated Pest Control Branch is now accepting applications for the Vertebrate Pest Control Research Program (VPCRP). This funding opportunity is designed to support innovative research and education projects aimed at…
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Armillaria
UC Marin Master Gardeners: Document

Armillaria

 Armillaria root rot, also known as Oak root fungus, is a disease of many different plants.  There is no known effective cure.  Root rot fungus disease of trees and woody plants. Affects palms, succulents, ferns and other herbaceous plants like begonia, daffodil, dahlia, and geranium.  No…
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Damping Off
UC Marin Master Gardeners: Document

Damping Off

Seedlings sometimes fail to sprout or die soon after. Seeds may rot before germinating, shoots may decay before they emerge, or stems of seedlings may be attacked near the soil line, causing young plants to collapse. These diseases are collectively called “damping off,” likely caused by a number of soil…
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downy mildew
UC Marin Master Gardeners: Document

Downy Mildew

Downy mildews, including Peronospora and Plasmopara spp., are pathogenic water molds (oomycetes) that primarily damage foliage. Hosts include cane berries, roses, various herbaceous ornamentals, and many fruit, grain, and vegetable crops. CategoryFungiSigns/SymptomsDowny mildew causes pale green to…
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Brown, scorched-looking leaves are symptoms of fire blight in trees in the apple and pear family. Photo: Sebastian Stabinger
UC Marin Master Gardeners: Document

Fire Blight

 Fire blight is a common and frequently destructive disease of pome fruit trees and related plants.  The disease can destroy limbs and even entire shrubs or trees. Caused by the bacterium Erwinia amylovora. Pear (Pyrus species) and quince (Cydonia) are extremely susceptible.  Apple, crabapple …
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fusarium wilt
UC Marin Master Gardeners: Document

Fusarium Wilt

Fungus.  Various host-specific forms of Fusarium oxysporum can kill infected plants. Hosts include asparagus, bean, cabbage, cantaloupe, pea, tomato, and watermelon. There are many varieties of host plants with resistance to Fusarium wilt.Like verticillium, causes leaf…
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blight
UC Marin Master Gardeners: Document

Late Blight on Potatoes

Late blight of potato was responsible for the Irish potato famine of the late 1840s. Late blight is caused by the oomycete Phytophthora infestans. Oomycetes are fungus-like organisms also called water molds, but they are not true fungi. CategoryFungiSigns/SymptomsLesions appear as small dark green water…
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