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Suppression of Frankliniella bispinosa (Thysanoptera: Thripidae) and the Fungal Pathogen Colletotrichum gloeosporioides, with Pesticides During the Bloom Cycle and Improved Fruit Set on ∼Naver Orange in Florida

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Abstract:

Four field experiments were conducted in two 'Navel' orange groves in southwest Florida between 1988-1990. Insecticides were applied alone, in combination with the fungicide benomyl, or benomyl was applied alone during 'Navel' orange flowering cycles between February and April. The duration and intensity of flowering differed each year. Population densities and peak activity of Frankliniella bispinosa (Morgan) differed by year and by site during the same year. Fifty-unit samples of small (5-9 mm), medium (10-13 mm), and large (∼14 mm) floral buds, open flowers, and fruitlets were evaluated to determine the optimal stage of floral development for sampling adults and larvae of F.bispinosa. All floral stages were infested but open flowers consistently had the highest numbers of both adults and larvae and were used to assess treatment differences in thrips populations after 1988. Results showed a positive relationship between population suppression of F. bispinosa during the flowering cycle and subsequent 'Navel' orange fruit set in late June or early July. Chlorpyrifos, dimethoate, and formetanate hydrochloride were effective in suppressing numbers of F.bispinosa, with activity lasting 3-7 dafter application. Two or more applications of benomyI resulted in fruit set increases each year in the four field experiments compared with fruit set increases in three of four experiments where insecticides only were applied. The fungal pathogen, Colletotrichum gloeosporioides Penzig, was identified previously as the causative organism for postbloom fruit drop disease on citrus. This study demonstrated that there are two potential factors( F. bispinosa and C. gloeosporioides) involved in reduced fruit set on 'Navel' orange during the flowering cycle in Florida.

Document Type: Research Article

Publication date: August 1, 1992

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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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