Rapid spread of alfalfa pest: Spotted alfalfa aphid infests about of state's alfalfa acreage within two years after its discovery in California
AuthorsRay F. Smith
John E. Swift
Authors AffiliationsRay F. Smith is Associate Professor of Entomology, University of California, Berkeley; John E. Swift is Extension Entomologist, University of California, Berkeley; Jack Dibble is Extension Field Technologist, University of California, Berkeley.
Hilgardia 10(2):5-15. DOI:10.3733/ca.v010n02p5. February 1956.
The worst pest of alfalfa ever to reach California has spread within two years to 33 alfalfa-producing counties.
Smith R, Swift J, Dibble J. 1956. Rapid spread of alfalfa pest: Spotted alfalfa aphid infests about of state's alfalfa acreage within two years after its discovery in California. Hilgardia 10(2):5-15. DOI:10.3733/ca.v010n02p5
Also in this issue:California egg buying systems: Factors affecting wholesale prices of eggs in principal markets influenced by dominant buying system of local area
Range grazing capacity raised: Program of seeding annual clovers, fertilization and grazing management resulted in improved forage quality and quantity
Removal of tinder in ponderosa: Prescribed burning of forest brush during the wet season by tested methods effectively reduces hazard of wildfire
Red mite on pears: New acaricides included in early spray tests for control of European red mite
Russet on bartletts: Pears from trees treated with copper or streptomycin equally free from russet
Codling moth on walnuts in '55: Downward trend in infestations of 1955 in northern California not uniform and need of control treatments in 1956 indicated
DDT residues on sweet corn: Kernels and cob of corn treated with DDT remain practically free of residues but amounts on plant restrict use as fodder
Zinc-deficient crops: Sweet corn, tomatoes, beans, and sugar beets used in tests for zinc deficiency
Nitrogen trichloride and other gases as fungicides