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1 June 2000 Response of Omnivorous Leafroller (Lepidoptera: Tortricidae) and Onion Thrips (Thysanoptera: Thripidae) to Low-Temperature Storage
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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.

Victoria Y. Yokoyama and Gina T. Miller "Response of Omnivorous Leafroller (Lepidoptera: Tortricidae) and Onion Thrips (Thysanoptera: Thripidae) to Low-Temperature Storage," Journal of Economic Entomology 93(3), 1031-1034, (1 June 2000).
Received: 15 April 1999; Accepted: 1 March 2000; Published: 1 June 2000

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