The effects of buprofezin against the citrus mealybug Planococcus citri.
Buprofezin, an insect growth regulator, was evaluated at 3 different application rates, 37.5, 75.0 and 150 p.p.m., for control of Planococcus citri on celery plants. Adult female P. citri were added to young celery plants within insect-proof perspex containers and allowed to establish over a 4-week period. The infested plants were then divided into 4 groups for treatment, each of 3 groups receiving one of the buprofezin concn and the fourth, a plain tap water application as a control. All plants were individually sprayed to 'just before run-off' point. No visible reduction in infestation levels were observed within any of the treatments until 26 days after treatment, when large numbers of dead early-instar larvae were observed on buprofezin-treated plants. A destructive analysis of all plants revealed that mealybug infestation had been significantly reduced on plants receiving the buprofezin treatments when compared to the water-treated controls. There was an indication that effects on mealybugs were greater, the higher the rate of buprofezin applied. However, low numbers of surviving mealybugs, within even the 150 p.p.m. treatment, indicated that a repeat application may be required for complete or continued control. No phytotoxic damage or response was observed on any of the celery plants within any of the treatments.