POPULATION DYNAMICS AND CITRUS FRUIT DAMAGE BY TWO SPECIES OF LEAFROLLER, ARGYROTAENIA AMATANA AND ARGYROTAENIA KIMBALLI (LEPIDOPTERA: TORTRICIDAE)

BULLOCK, R. C.

Abstract


Larvae of Argyrotaenia amatana (Dyar) and A. kimballi Obraztsov (Lepidoptera: Tortricidae) were observed feeding on and were reared on citrus leaves and fruit in Fort Pierce, FL. A pheromone trapping program for adult males of both species was begun in 1989 using Pherocon® 1C traps to monitor flight periods. In 1991, 1995 and 1996, three field tests of the Dipel® 2 × formulation of Bacillus thuringiensis were evaluated for efficacy against larval feeding on Hamlin oranges. At no time was larval feeding found to increase premature fruit drop at post bloom. In all three years, the percentage of fruit damaged by caterpillar feeding was significantly reduced (P 0.05) in plots sprayed with B. thuringiensis. Adult male moth captures of A. amatana and A. kimballi from 1990 to 1996 indicated a peak of flight and mating activity each year in April, with continued activity throughout May and June. September and October were the months of least activity.

Keywords


hamlin orange; ray ruby grapefruit; caterpillar feeding; citrus fruit injury; citrus fruit damage; argyrotaenia amatana; argyrotaenia kimballi; bacillus thuringiensis

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283