Effect of temperature on post-diapause reproductive development in Listronotus maculicollis (Coleoptera: curculionidae)

Bulletin of Entomological Research
Shaohui WuAlbrecht M Koppenhöfer

Abstract

The annual bluegrass weevil Listronotus maculicollis requires chilling exposure to terminate reproductive diapause during overwintering, but the effects of temperature on its post-diapause development in spring remain unclear. To explore this effect, overwintering adults were transferred from cold conditions (6°C/4°C, L:D 10:14) to different warm-up temperatures at L:D 12:12. When weevils were transferred to 7, 14 and 21°C in December and late January, the sizes of male and female reproductive organs were significantly smaller at 7°C than at 14 and 21°C. When weevils were transferred to 7, 9, 11, 13 and 15°C in late January, higher temperatures facilitated the post-diapause development. In both sexes, the sizes of reproductive organs and developmental rate increased with temperature. Reproductive organs did not grow significantly at 7°C in males and at 7-9°C in females, at which the percentage of developing weevils remained low. The time required for 50% of individuals to resume development was 44, 18, 13 and 8 days at 9, 11, 13 and 15°C, respectively, in males and 19, 14 and 8 days at 11, 13 and 15°C, respectively, in females. The threshold temperature for post-diapause development was 7.8°C in males, based on which 61.7 degre...Continue Reading

References

Jul 1, 1974·Journal of Neurosurgery·A E JamesB L Rish
Dec 8, 2005·Journal of Insect Physiology·Vladimír Kostál
Feb 4, 2012·Journal of Economic Entomology·Vojtech JarosíkJirí Skuhrovec
Feb 1, 1986·Journal of Chemical Ecology·S Ahmad
Nov 15, 2017·Journal of Insect Physiology·Shaohui WuAlbrecht M Koppenhöfer

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