Field evaluation of systemic imidacloprid for the management of avocado thrips and avocado lace bug in California avocado groves

Pest Management Science
Frank ByrneJoseph G Morse

Abstract

The efficacy of systemic applications of imidacloprid for the management of avocado thrips and avocado lace bug was determined in field trials. Following insecticide treatment by chemigation, leaves of appropriate age for each insect were sampled over a 6 month period and used for bioassays. Imidacloprid residues were measured by ELISA in leaves used for bioassays to determine concentrations of insecticide that were toxic to both pests. The uptake of imidacloprid into treated trees was extremely slow, peaking in the current year's leaf flush at only 8 ng cm(-2) leaf tissue after 15 weeks. Avocado thrips mortality in bioassays with young flush leaves, the preferred feeding substrate for this insect, was minimal, indicating that imidacloprid concentrations were below threshold levels needed for effective control. Residues present in older leaves, which are preferred by the avocado lace bug, were higher than in young flush leaves, and provided good control of this pest. Probit analysis of bioassay data showed that the avocado lace bug (LC(50) = 6.1 ng imidacloprid cm(-2) leaf tissue) was more susceptible to imidacloprid than the avocado thrips (LC(50) = 73 ng imidacloprid cm(-2) leaf tissue). In spite of the slow uptake of imidacl...Continue Reading

References

Jan 1, 1996·Bulletin of Environmental Contamination and Toxicology·J RouchaudA Wauters
Jun 21, 2006·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Weiping LiuKevin K Liu
Jun 23, 2006·Pest Management Science·Eduardo C Humeres, Joseph G Morse
Jul 27, 2007·Pest Management Science·Frank J ByrneJoseph G Morse
May 12, 2009·Pest Management Science·Dhana Raj BoinaLukasz L Stelinski

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