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Cold tolerance and overwintering of the diamondback moth (Lepidoptera: Plutellidae) in Southeastern Australia

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Gu, H. (2009) Cold tolerance and overwintering of the diamondback moth (Lepidoptera: Plutellidae) in Southeastern Australia. Environmental Entomology, 38 (3). pp. 524-529.

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Article Link: https://doi.org/10.1603/022.038.0303


Southeastern Australia is situated in a temperate zone with generally mild winters. The diamondback moth, Plutella xylostella L., can be a serious pest of canola as well as of other Brassica crops in this region. However, the ability of P. xylostella to overwinter in southeastern Australia, as well as in other temperate regions of the world, remains controversial. Laboratory experiments indicated that after 60 d in a temperature regimen alternating between 0 and 5°C, 32% of third- and fourth-instar larvae pupated, 38% remained as larvae, and 57% of pupae survived, whereas only 15-20% of adult moths were still alive. Second-, third-, and fourth-instar larvae and pupae survived - 5°C for up to 2, 4, 6, and 13 d, respectively, with some adults surviving >20 d. Furthermore, adults that survived 60 d of exposure to 0-5°C and 20 d at -5°C reproduced normally without supplemental food. An experiment simulating outdoor overwintering with caged populations and field survey for natural overwintering populations of P. xylostella on volunteer canola (Brassica napus L.) and wild turnip (Rapistrum rugosum L.) plants indicated that development and reproduction continued on these host plants through the winter months. These empirical results provide evidence that P. xylostella is capable of overwintering on suitable host plants in southeastern Australia, and the overwintering populations may contribute significantly to local population levels in spring and summer seasons. © 2009 Entomological Society of America.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Cold tolerance Overwintering Pest management Plutella xylostella canola host plant moth reproduction seasonal variation survival temperate environment temperature effect winter Australasia Australia Brassica Brassica napus Brassica napus var. napus Brassica rapa subsp. rapa Lepidoptera Plutellidae Rapistrum rugosum animal article cold female life cycle male physiology population dynamics season Animals Cold Temperature Life Cycle Stages Moths New South Wales Seasons
Subjects:Science > Entomology
Plant culture > Field crops
Plant pests and diseases
Live Archive:17 Feb 2022 01:57
Last Modified:17 Feb 2022 01:57

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