Authors: WHITING, DIANA C.; FOSTER, STEPHEN P.; VAN DEN HEUVEL, JAMIE; MAINDONALD, JOHN H.

Source: Journal of Economic Entomology, Volume 85, Number 6, December 1992 , pp. 2305-2309(5)

Publisher: Entomological Society of America

Abstract:

In a controlled atmosphere of 0.4% 02' 5%CO₂, previously found to rapidly kill the tortricid Epiphyas postvittana (Walker), the mortality responses of3-d-old eggs and first, third, and fifth instars of three tortridd pests of New Zealand apples (two endemic species, Planotortrix octo Dugdale and Ctellopseustis ohliqualla [Walker], and an introduced species, Cydia pomollella [L.]), were detemlined at two different temperatures. At 20C, all three species showed a pattern of susceptibility of the different stages to the atmosphere similar to that found for E. postvittana (i.e., in order of decreasing estimated time for 99% mortality [LTHH]fifth instars (including both diapausing and nondiapausing larvae of Cydia pomonella) > third instars ˜3-d-old eggs ˜ first instars. Responses of the four species showed a general trend of decreasing LTHHSt 20C in the following order: Cydia pomollella > E. postvittana = P. octo = Ctellopseustis ohliqualla. An increase in treatment temperature to 30C resulted in significant decreases in LTflUSor all stages of all three species by factors of between 1.8and 9. The order of susceptibility ofthe four species at 30C changed relative to that at 20°C, with smaller differences between Cydia pomonella and E. postt;ittana. Most noticeably, all stages of P. octo and Ctenopseustis obliquana had significantly lower LTfl9sthan those of the corresponding stages of E. postvittana.

Document Type: Research article

Publication date: 1992-12-01

More about this publication?

• Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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