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Thermal Death in Third Instars of the Caribbean Fruit Fly (Diptera: Tephritidae): Density Relationships

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The effect of larval density on survival of 3rd instars of the Caribbean fruit fly, Anastrepha suspense (Loew), was studied in the laboratory. No difference in mortality rates was observed among different densities held at ambient temperatures (≍25ºC) in closed containers. However, when larvae were treated in closed containers at 40ºC for 67 min, survival rates rapidly decreased with the increase in infestation density, then leveled off at ≍20% survival; this relationship was described by a nonlinear regression mathematical model. Similar results were obtained with the same treatment for larvae in open containers. Further studies showed that increased mortality was related to density, not increased numbers of larvae. The presence of rearing diet during treatment reduced survival regardless of the density level. The implications of these findings in the development of quarantine treatments are further discussed.

Document Type: Research Article

Publication date: April 1, 1997

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  • 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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