Canadian Forest Service Publications

Responses of larval Choristoneura rosaceana (Harris) (Lepidoptera: Tortricidae) to a feeding stimulant. 1997. Li, S.Y.; Fitzpatrick, S.M. The Canadian Entomologist 129: 363-369.

Year: 1997

Issued by: Pacific Forestry Centre

Catalog ID: 4817

Language: English

CFS Availability: Order paper copy (free)

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Abstract

The commercial feeding stimulant Pheast ® was tested in the laboratory to determine its attractive and phagostimulatory effects on larval Choristoneura rosaceana (Harris). In choice experiments, larvae were attracted initially to filter paper discs treated with Pheast, but did not remain on or near treated discs. Larvae were not attracted initially to raspberry leaf discs treated with Pheast, but were more likely to stay near treated leaf discs than water-dipped ones. Larvae were neither attracted to nor arrested on whole raspberry leaves treated with Pheast. In no-choice experiments, larvae fed Pheast-treated leaves consumed more leaf tissue than, and grew almost twice as quickly as, larvae fed leaves dipped in water. When larvae were fed leaves treated with Dipel WP (Bacillus thuringiensis var. kurstaki) plus 5% Pheast, the mortality was 93% greater than that of larvae fed leaves treated with Dipel WP alone. These results suggest that Pheast has potential to enhance efficacy of B. thuringiensis against C. rosaceana on raspberries in the field.