Leaf curl plum aphid control: Tests in 1954 season developed spray treatments against insect pest of sudden economic importance
AuthorsHarold F. Madsen
James E. DeTar
Authors AffiliationsHarold F. Madsen is Assistant Entomologist, University of California, Berkeley; James DeTar is Farm Advisor, Placer County, University of California.
Hilgardia 9(1):8-13. DOI:10.3733/ca.v009n01p8. January 1955.
An outbreak of the leaf curl plum aphid—Anuraphis helichrysi Ka1t.—occurred in 1953 in Placer County, where a considerable acreage of plums was severely attacked. The aphid—in California for many years but not as a pest of major importance—curls the leaves of the tree in early spring, and new leaf growth is tightly curled during the early summer. As a result of the leaf damage, fruit does not properly develop, and shoot growth is severely stunted.
Also in this issue:The California apparatus for respiration trials with large animals
Farm population of California: Prospective adjustments in state's agriculture resulting from rapidly growing population studied
Brush control in ponderosa pine: Technics of prescribed burns to encourage growth of desirable game browse in second-growth timber
Timber in Humboldt County: Economic appraisal of forest conditions undertaken to investigate development and use of main resource
Allotments for California rice: Growers must choose between lower market prices and support prices with their production controls
Cotton phosphate fertilization: New soil test provides reliable and easily applied diagnostic guide to quantity of available phosphate
Control of nematodes on grapes: Soil fumigation with crop rotation tested as way to protect grape replants against root parasites
Harvest time affects valencias: Yield, fruit size and grade influenced by early, late, or midseason timing of orange harvesting
California livestock industry: Competitive position of state's industry influenced by transportation rate structure and distribution
External parasites of poultry: Tests indicate malathion may prove to be effective control for common external parasites of poultry