Biological control: Natural enemies of aphid in California sought in European, Mid-East countries
Author AffiliationsC. P. Clausen is Chairman, Department of Biological Control, University of California, Riverside.
Hilgardia 9(7):4-4. DOI:10.3733/ca.v009n07p4b. July 1955.
Field observations on the yellow clover aphid were made in southern California during the past year to determine the status of the predators that attack the aphid and the presence or absence of internal parasites. No internal parasites were found.
Also in this issue:Deciduous fruits: Trends and prospects as influenced by population and national income studied
FertiIized pastures: Legumes and perennial grasses respond to split-fertilization in range tests
Yellow clover aphid on alfalfa: Pest not ruinous to state's alfalfa industry but production costs increased by frequent field inspections and treatments
Chemical control: Insecticides when properly applied will give effective commercial control of pest
Resistant plants: Alfalfa variety resistant to aphid attack and adapted to desert areas planned
Prune harvest methods, costs: Comparative study made on efficiency of various types of labor-saving equipment used in 1954 prune harvest season
Effects of irrigation on the growth and yield of cotton: Amounts and timing of applications influence lint grade and staple length
Effects of irrigation on the growth and yield of cotton: Fruting, defoliation, lodging, boll opening related to available moisture
Combine used in corn: Two types of gathering attachments successful in harvesting trials in 1954
Field corn pickers: Tests indicate two operational factors have important effect on field losses
Hybrid corn trials: Effect of summer temperatures on corn maturity in Santa Barbara County
Morphological development of the fruit of Juglans regia