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1 August 2007 Feeding Behavior and Growth of Corn Earworm (Lepidoptera: Noctuidae) Larvae on Bacillus thuringiensis-Treated (Dipel 4L) and Untreated Meridic Diet
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Abstract

The effect of Dipel 4L in artificial diet on feeding behavior, occurrence on a specific diet, and growth of corn earworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae), was assessed in short-term tests. Third-, fourth-, and fifth-stage laboratory-reared and feral corn earworm larvae were evaluated. Arenas used for each assay included a non-Dipel diet, Dipel-containing diet, and a combination of the two diets. Larval activity was observed immediately after exposure to diet and at 6 and 18 h for third instars and at 6, 8, and 24 h for fourth and fifth instars, respectively. Feral and laboratory-reared third, fourth, and feral fifth instars avoided Dipel-treated diet when more suitable food was available. Third and fourth instars consistently preferred non-Dipel-containing diet when presented a choice of foods. Corn earworm growth was delayed when larvae were subjected to Dipel-treated diet in choice and no-choice assays compared with larvae provided untreated diet. Larvae presented a choice of diets grew more rapidly than those presented Dipel-treated diets in no choice arenas. Larval feeding frequency and weight gain were superior when larvae were supplied untreated diet than when restricted solely to a Dipel-treated diet. Larvae presented a choice of diets spent more time feeding and fed more frequently on untreated diet than Dipel-treated food. These data indicate that corn earworm presented a choice of Bacillus thuringiensis (Bt) and non-Bt diets may have an increased probability of completing development compared with those restricted to Bt-laced sources.

Robert D. Bowling, Randall A. Higgins, Aqeel Ahmad, and Gerald Wilde "Feeding Behavior and Growth of Corn Earworm (Lepidoptera: Noctuidae) Larvae on Bacillus thuringiensis-Treated (Dipel 4L) and Untreated Meridic Diet," Journal of Economic Entomology 100(4), 1221-1228, (1 August 2007). https://doi.org/10.1603/0022-0493(2007)100[1221:FBAGOC]2.0.CO;2
Received: 22 March 2006; Accepted: 7 March 2007; Published: 1 August 2007
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