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Cover:
A 160-acre 20-year old plantation of Eucalyptus viminalis (manna gum) in Slaughter House Gulch in Mendocino County was a recent venture to commercialize eucalyptus in California. Current research by the University of California in short rotation intensive culture has improved selection and management of eucalyptus, increasing its potential for fuel and pulpwood.
Cover:
Fila, a prize-winning border collie, keeps a wary eye on sheep in an alfalfa grazing plot. The mother of Butch, the official sheep dog at UC Davis, Fila helped owner Dick Pelton move the sheep between plots in a study of the effect of grazing on alfalfa.
Cover:
Unless disrupted by sprays for other walnut pests, a parasitic wasp usually keeps walnut aphids under control in orchards. Aphid mummy, seen with walnut aphids on a leaf in the cover photo, shows evidence of parasitization by the wasp, Trioxys pallidus, which lays an egg inside each aphid host. The developing parasite kills the aphid, transforms it into a mummy, and eventually emerges as an adult. Researchers have developed a resistant strain of the wasp, which they hope will be able to survive Guthion sprays applied to control coddling moth and navel orangeworm in walnut orchards. Cover photo by Jack Kelly Clark
Cover:
Productivity of plants and animals on a lush, fertilized legume pasture of the Sierra Foothill Range Field Station was substantially improved in a three-year study. The most profitable approach was seeding with sub and rose clovers and fertilizing with phosphorus and sulfur. Cover photo by Charles Raguse
Cover:
Huge fields of flowers being grown for seed, such as these marigolds and petunias, are common sights in the Lompoc Valley of California near Santa Barbara. Marigolds are also grown for seed in large commercial greenhouses, where the leafminer is a pest. This article reports on the use of a parasitic wasp to control leafminers in greenhouse marigolds. Photo courtesy Bodger Seeds, Ltd., of Lompoc.
Feeding dairy goats
Cover:
Sales of goat cheese and other goat milk products are increasing, and some former dairy cow owners are shifting to goat dairies. A survey showed that profitability can be improved by utilizing low-cost agricultural by-products in goat rations.
November-December 1988
Volume 42, Number 6
Volume 42, Number 6