Walnut aphid studies in 1955: Experimental systemic aphicide OMPA has outstanding promise but more studies needed before release for commercial use
AuthorsA. E. Michelbacher
Authors AffiliationsA. E. Michelbacher is Associate Professor of Entomology, University of California, Berkeley; Earl Oatman is Research Assistant, University of California, Berkeley.
Hilgardia 10(3):9-14. DOI:10.3733/ca.v010n03p9. March 1956.
The 1955 infestations of the walnut aphid were exceedingly severe in certain areas, such as Linden. By early May, the average number of aphids found—on the next to the terminal leaflets—in some orchards exceeded 50.
Also in this issue:California swine industry: Transportation costs, price differentials, alternative farm enterprises, among factors affecting state's swine industry
New air powered hand duster: Use of compressed air to fluidize dusts permits treatment of 7,000 square-foot-capacity glasshouse in less than half hour
Aphid damage to alfalfa hay: Honeydew of spotted alfalfa aphid apparently not distasteful to cattle but protein and carotene in damaged hay are reduced
Woolly apple aphid control: Upward and downward migration of aphid throughout trees reduced in preliminary experiments with chemical compounds
Control of cyclamen mite: Stocking test plots in new fields with natural enemies has given biological control on strawberries in first crop year
Control of walnut blight: Antibiotic and copper formulations tested in modified spray program in experimental plots in Sun Joaquin County
New roots on pine seedlings: Greenhouse tests with ponderosa pine seedlings indicate time of transplanting affects rooting ability of seedling
Sodium-calcium in young citrus: Ratio of sodium to calcium in the nutrient solution of sand cultures shown to affect mineral absorption and plant growth
Trifoliate orange seedlings: Effect of various soil chemical properties on growth of trifoliate orange seedlings in sandy and in loam soils
The cyclamen mite, Tarsonemus pallidus, and its control on field strawberries