Applied Entomology and Zoology (2001) 36, 443-449

From Pestinfo-Wiki
Jump to: navigation, search

Michikazu Nomura and Yukio Ishikawa (2001)
Dynamic changes in cold hardiness, high-temperature tolerance and trehalose content in the onion maggot, Delia antiqua (Diptera: Anthomyiidae), associated with the summer and winter diapause
Applied Entomology and Zoology 36 (4), 443-449
Abstract: Changes in cold hardiness, high-temperature tolerance and trehalose content in the onion maggot, Delia antiqua (Diptera: Anthomyiidae), associated with the summer and winter diapause were investigated. Survival of summer- and winter-diapausing pupae after a 15 day exposure to -15°C was greater than 80%, while less than 5% of non-diapausing pupae survived the same treatment. Greater than 80% of winter-diapausing pupae survived -23°C for 15 days, but survival of summer-diapausing pupae at the same procedure was less than 30%. More than 75% of summer- and winter-diapausing pupae, but not non-diapausing pupae, tolerated 35°C for 15 days. Trehalose concentrations in summer- and winter-diapausing pupae were not high at the beginning of diapause (~5 µg/mg), but increased gradually and reached 10 µg/mg in 40 days, although they were kept at relatively high temperatures of 25°C (summer diapause) or 15°C (winter diapause). Cold hardiness of pupae, however, was not proportional to their trehalose content; although trehalose concentrations in winter- and summer-diapausing pupae at day 40 (WD40 and SD40) were similar (~10 µg/mg), cold hardiness of these pupae differed largely (WD40>SD40).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Yukio Ishikawa

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
environment - cropping system/rotation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Delia antiqua Japan