EFFECT OF SULPHUR ON THE CITRUS RUST MITE Phyllocoptruta oleivora (Ashmead, 1879) (ACARI, ERIOPHYIDAE)
Abstract
This research was carried out at Taquari Experiment Station, in order to study the acaricide action of various pesticides against the citrus rust mite, in a 'Seleta Franck' orange orchard. The treatments and quantities of active ingredient, in grams per plant, were: sulphur 28.8, sulphur 48.0, sulphur 67.2, carbosulfan 1.2, bifenthrin 0.6, fenbutatin-oxide 1.8, and check. The estimate of the population was made one day before and 7, 14, 21, 28, 45 and 60 days after the pulverization of the products. The sampling was based on 10 leaves per plant, collected around the tree. The counting of mites was performed in five points in the upper face of the leaves, with stereoscopic microscope adjusted for 20 x, being three along the middland veio and two on the larger face of the leaf. The results support thc conclusion that sulphur (28.8 g A.I./plant and 48.8 g A.L/plant) and carbosulfan were efficient until 45 days after the pulverization. The more efficient acaricide was fenbutatin-oxide and the less efficient was bifenthrin.
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