Eggs and first–fifth instars of omnivorous leafroller, Platynota stultana Walshingham, had a mean percentage survival to the adult stage of 60.7–95.2% for nonexposed immatures and 14.5–54.3% for immatures exposed to 1 wk at 0–1°C. Exposures of 2–5 wk resulted in 0–6.7% survival, and a 6-wk exposure resulted in <1% survival of all stages tested. A significant reduction in survival of all larval stages occurred between exposures of 0 and 1 wk and between 1 wk and 2–6 wk. Survival of eggs after exposures of 0 and 1 wk was significantly different than survival after exposures of 2–6 wk. The second instar was the stage least susceptible to low-temperature storage. Adults that were exposed to low temperature for 1 wk in the third through fifth instars laid a mean of 120–289 eggs per female, and the mean percentage viability of the eggs ranged from 56.2 to 71.4%. Mean percentage survival of adults and nymphs of onion thrips, Thrips tabaci Lindeman, was inversely related to the duration of exposure from 1 through 3–6 wk at 0–1 and 5°C and was lower at 0–1 (0.2–52.5%) than at 5°C (17.6–66.6%). Exposure to 0–1°C for 4 wk attained 91.2% control, which increased to 99.8% after 6 wk. Low-temperature storage has potential to control omnivorous leafroller in table grapes, Vitis vinifera L., and onion thrips in onions, Allium cepa L.
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Vol. 93 • No. 3