Comparative Mortalities of Six Tortricid (Lepidoptera) Species to Two High-Temperature Controlled Atmospheres and Air
Authors: WHITING, DIANA C.; O'CONNOR, GLENDA M.; HEUVEL, JAMIE VAN DEN; MAINDONALD, JOHN H.
Source: Journal of Economic Entomology, Volume 88, Number 5, October 1995 , pp. 1365-1370(6)
Publisher: Entomological Society of America
Abstract:Mortality responses of 3-d-old eggs and 1st, 3rd, and 5th instars of 6 New Zealand tortricids to 2 controlled atmospheres (1.2% O2 and 4.2% O2 with 5% CO2 at 40) and 40 air were determined. Endemic species, Ctenopsel1stis obliql1ana (Walker), Ctenopsel1stis herana (Felder and Rogenhofer), Planotorlrix excessana (Walker), planotortrix~ octo Dugdale, and Cnephasia jactatana (Walker), all exhibited similar mortality responses, with a common pattern of increasing time LT99 as the oxygen level increased (1.2% O2 atmosphere :5 4.2% O2 atmosphere :5 air). Typically, 3-d-old eggs were more susceptible to treatment than larval stages tested. However, this pattern lessened with increasing O2 concentration of treatment in three species. All endemic leafroller species were sensitive to the high treatment temperature. Collectively (over all life stages tested), the LT99 never differed by > 3.9 h within a single treatment or by 4.6 h over all 3 treatments. Whereas Epiphyas postvittana displayed a similar order of increasing tolerance to treatment (1.2% O2 atmosphere ≤4.2% O2 atmosphere < air), response differences among the treatments were greater than in endemic species. Mean LT99 values for stages of E. postvittana decreased in the following order: 5th instars 2: 3rd instars > 1st instars ≍3-d-old eggs. Only LT99s of 3rd and 5th instar E. postvittana exceeded those of their endemic counterparts. Mean LT99 values for 5th instar E. postvittana to the 1.2% O2atmosphere, 4.2% O2 atmosphere and air treatments were 8.5, 15.5, and 21.1 h, respectively.
Document Type: Research Article
Publication date: October 1, 1995
- 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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