Navel orangeworm: Summer infestations of codling moth on walnuts favorable to navel orangeworm
AuthorsA. E. Michelbacher
Authors AffiliationsA. E. Michelbacher is Professor of Entomology, University of California, Berkeley; Norman Ross is Farm Advisor, Stanislaus County, University of California.
Hilgardia 11(7):12-12. DOI:10.3733/ca.v011n07p12. July 1957.
Summer walnuts infested with the codling moth furnish breeding locations for the navel orangeworm and—as a result—a population of moths is present in the orchard when the husks begin to crack as the harvest period approaches. The caterpillars of the navel orangeworm are unable to penetrate the green husks of sound walnuts so they are not subject to infestation until maturity is reached and the husks split. After this stage of nut development is reached, the crop is open to attack until it is harvested. As a result the amount of infestation tends to increase as harvest is delayed.
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Tree fruit cuttings propagated: Vegetative propagation of softwood cuttings of certain tree fruit rootstocks achieved by chemical and mist treatments
Weeds in drained rice fields: Early application of herbicides by air and by ground rig controlled weeds in drained rice fields in tests in 1956
Milled rice yields: Tests show yield and quality affected by drying-air temperature and humidity
Fertilizer placement for rice: Ammonium-form nitrogen drilled into seedbed before flooding increased rice yields 25% to 50% in placement experiments
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