SAMPLING OF Dichopehnusnotus KEIFER (ACARI: ERIOPHYIDAE) IN MATE ORCHARDS
Abstract
The mito Dichopelmus notus (Acari, Eriophyidae) causes tan and fali of leaves in mate tree. The treatments: canopy thirds (upper, medium and lower) and depth inside canopy (internal and external) were arranged in randomized blocks with a factorial design, with ten replications (trees), and were performed in an orchard in Chapecó, Santa Catarina to propose a sampling plan for Dichopelmus. Each plot consisted of one tree. Samples of three leaves per treatment were collected every two weeks from February through May 1999, per treatment. The number of mites/1 cm2 of each leaf was counted at laboratory. Through the modal, an estimator of the overall mean variance and the variances associated with random effects was obtained. The number of trees (10 and the number of leaves (L) were obtained by the combination of KxL, timing the variance of the mean at a minimum level. Results indicate that it is necessary to examine three internal leaves from inferior or medium thirds on a minimum of 110 trees.
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