EFFECT OF ACARICIDE TREATMENTS ON PEST NATURAL ENEMIES OF CITRUS PLANTS
Abstract
This research was carried out at the FEPAGRO Experiment Station (Viamão-RS) in 1995, to study the selectivity of acaricides on natural enemies, in a five-year-old orange orchard of cv. 'Valencia'. The desing was randomized blocks with four replicates. The treatments and the quantities of a. i. at grams/100 liters of water, were: fenpyroximate (5); cyhexatin (25); abamectin + mineral oil (0.54 + 189); acrinathrin (0.5); amitraz (37.5); sulfur (400); fenpropathrin (15); check. The estimates were done at three days before and at five, 12, 25, and 45 days after pulverization. The sampling was based on five-minute-suction at two troes per plot, with a suction collecting machine. The counting of beneficiai artropods captured, was done in laboratory, with a stereoscopic microscope adjusted for until 40 times. The sulfur showed prominence in selectivity for the artropods whereas the fenpropathrin showed higher toxicity.
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