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The effects of thermal acclimation on immature mortality in the Queensland fruit fly Bactrocera tryoni and the light brown apple moth Epiphyas postvittana at a lethal temperature
Author(s) -
Beckett S. J.,
Evans D. E.
Publication year - 1997
Publication title -
entomologia experimentalis et applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.765
H-Index - 83
eISSN - 1570-7458
pISSN - 0013-8703
DOI - 10.1046/j.1570-7458.1997.00112.x
Subject(s) - biology , acclimatization , tortricidae , larva , instar , tephritidae , lepidoptera genitalia , botany , zoology , pest analysis , horticulture
Mortality data for non‐acclimated and acclimated 3rd instar larvae and mid‐term eggs of Bactrocera tryoni (Froggatt) (Diptera: Tephritidae) were obtained after immersing in hot water at 46 °C. Acclimation consisted of holding the larvae and eggs at 35 °C for 20 and 11 h respectively just prior to heat‐treatment. The median lethal time (LT50) for acclimated larvae was found to be 6.9 min compared to 2.5 min for non‐acclimated larvae. LT99.999 for acclimated larvae was 20.9 min compared to 8.7 min for non‐acclimated larvae. LT50 for acclimated eggs was 5.0 min compared to 2.4 min for non‐acclimated eggs. LT99.999 for acclimated eggs was 26.0 min compared to 6.6 min for non‐acclimated eggs. For 3rd instar larvae, most acclimation effect on mortality had occurred by 8 h. A notable residual response was present 20 h after acclimation had occurred, reducing mortality at 46 °C for 4.5 min by roughly 25%. Mortality data at 46 °C were also obtained for non‐acclimated and acclimated late instar larvae of Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae). With this species, LT50 for acclimated larvae was 2.5 min compared to 1.1 min for non‐acclimated larvae. LT99.999 for acclimated larvae was 9.5 min compared to 4.6 min for non‐acclimated larvae.