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Day-degree development and phenology modelling of the immature stages of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae), a pest of eucalypt plantations
journal contributionposted on 2023-05-16, 14:11 authored by Nahrung, HF, Geoff AllenGeoff Allen, Patel, VS
Day-degree developmental requirements and lower temperature thresholds were determined in the laboratory for the immature lifestages and preoviposition periods of Chrysophtharta agricola, a pest of eucalypt plantations in Tasmania and Victoria. These data were used to provide a predictive model for C. agricola's spring-summer phenology under field conditions. The model was validated using field data from two Tasmanian field sites over three seasons. Lower temperature thresholds for immature development ranged from 2.8Â°C (Liv) to 10.3Â°C (Li), while the lower temperature threshold for oviposition was 7.4Â°C for teneral and overwintered adults. Total immature development time (egg-adult) was approximately 400 Â± 16 DD above 8 Â± 0.41Â°C. Development time did not differ between males and females, or between offspring of different females. Beetles reared at 25Â°C were significantly larger than those reared at low temperatures. Day-degree models were usually a good predictor of the appearance of developmental stages in the field.
Publication titleAustralian Journal of Entomology
Department/SchoolTasmanian Institute of Agriculture (TIA)
PublisherBlackwell Publishing Asia
Place of publicationCarlton, Victoria, Australia