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Navel Orangeworm (Lepidoptera: Pyralidae) Development In Sunburned Walnuts, Mark D. Shelton, Donald W. Davis
Navel Orangeworm (Lepidoptera: Pyralidae) Development In Sunburned Walnuts, Mark D. Shelton, Donald W. Davis
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Navel orangeworrns, Amyelois transitella (Walker), completed development in sunburned walnuts late in the growing season, but moths did not emerge until after harvest. Sunburned walnuts were not attractive to ovipositing moths until considerable hull damage occurred. Only sunburned walnuts with undamaged kernels were suitable for larval development. Navel orangeworrn infestation levels up to 38% were recorded in sunburned walnut samples from the San Joaquin Valley, CA. Nut hull tissue damaged by sunburn was not selected over undamaged hull tissue for moth oviposition. Mean kernel temperatures of sunburned walnuts were higher than both undamaged walnuts and ambient air temperature. Premature hullsplit …