Nontarget Impact of Spinosad GF-120 Bait Sprays for Control of the Mexican Fruit Fly (Diptera: Tephritidae) in Texas Citrus

Bait sprays containing the toxicant spinosad (GF-120) were applied to citrus groves in the Rio Grande Valley of Texas where Mexican fruit flies were detected in surveillance traps. The sprays were applied as a supplement to a continuous sterile insect release program. Sterile fly captures were 47–63...

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Bibliographic Details
Published in:Journal of economic entomology 2005-12, Vol.98 (6), p.1950-1956
Main Authors: Thomas, Donald B., Mangan, Robert L.
Format: Article
Language:English
Subjects:
Anastrepha
Anastrepha ludens
Animals
bait sprays
baits
beneficial insects
Biological and medical sciences
Citrus
Citrus - parasitology
Control
Drug Combinations
ECOTOXICOLOGY
Fundamental and applied biological sciences. Psychology
Generalities
insect control
insect pests
Insecta
Insecticides - pharmacology
Invertebrates
Macrolides - pharmacology
natural enemies
nontarget organisms
parasitoids
Pest Control, Biological - methods
Phytopathology. Animal pests. Plant and forest protection
population density
Protozoa. Invertebrates
Secondary pests
spinosad
spraying
Tephritidae - drug effects
Tephritidae - radiation effects
Texas
Time Factors
trapping
Weather
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Summary:Bait sprays containing the toxicant spinosad (GF-120) were applied to citrus groves in the Rio Grande Valley of Texas where Mexican fruit flies were detected in surveillance traps. The sprays were applied as a supplement to a continuous sterile insect release program. Sterile fly captures were 47–63% lower in the treated groves compared with control groves. Eight of 10 secondary pest populations declined in the test groves subsequent to spray applications, but they also declined in the control groves, suggesting that the decline was a seasonal phenomenon rather than a result of the bait sprays. Citrus whitefly, Dialeurodes citri (Ashmead), populations increased modestly and citrus blackfly, Aleurocanthus woglumi (Ashby), populations remained unchanged compared with pretreatment levels. Thus, no outbreaks of secondary pests occurred as a result of the spinosad bait sprays in this instance, as has been reported for malathion bait sprays in citrus. The bait sprays had no detectable effect on populations of specific indicator species of parasitoids (including Aphytis spp. and Comperiella bifasciata Howard), or on numbers of beneficial insects in general, in the treated groves.
ISSN:0022-0493
1938-291X
DOI:10.1603/0022-0493-98.6.1950