Apple Damage, Pest Phenology, and Factors Influencing the Efficacy of Tebufenozide for Control of Obliquebanded Leafroller (Lepidoptera: Tortricidae)

Authors: Waldstein, Daniel E.; Reissig, W. H.

Source: Journal of Economic Entomology, Volume 94, Number 3, June 2001 , pp. 673-679(7)

Publisher: Entomological Society of America

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Abstract:

Fruit damage by obliquebanded leafroller, Choristoneura rosaceana (Harris), was examined on four different apple cultivars during 1997–1999 in heavily infested orchards in New York State. Initial fruit damage occurred 354 ± 26 degree-days base 6°C (DD6) after the first moth catch from the overwintering generation and continued to increase until after the typical spray season (≈1,300 DD6). In addition to apple damage by late instars, fruit damage occurred by early instars of the summer and overwintering generations. The insect growth regulator tebufenozide was used as a model insecticide to determine how a slow-acting insecticide and its relative toxicity to early (neonate) and late (fourth and fifth) instars may influence the efficacy of sprays for the control of the obliquebanded leafroller. Because tebufenozide is a slow-acting compound, bioassays were conducted to determine what percentage of the total mortality to neonates occurs at each 24 h interval until 10 d. Based on a polynomial regression, half of the total mortality to larvae at the LC25, LC50, LC90, and LC99 occurred at 7.2, 5.0, 4.1, and 3.0 d, respectively. Late instars were three times more tolerant to tebufenozide than neonates.

Keywords: Choristoneura rosaceana; apples; insect growth regulator; obliquebanded leafroller; tebufenozide

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493-94.3.673

Publication date: June 1, 2001

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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