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• W103581831 abstract "MACHI, A. R., R. V. ARAUJO, G. J. MORAES, V. ARTHUR. 2012. Biological control of the two-spotted mite (Tetranychus urticae Koch) in strawberry using the predatory mite Phytoseiulus fragariae Denmark & Schicha. Bol. San. Veg. Plagas, 38: 17-31. Tetranychus urticae Koch is a major pest of strawberry (Fragaria × ananassa Duchesne) in Brazil, and the biological control through the release of predatory mites of the Phytoseiidae family is a viable strategy. The study aimed to test the efficiency of Phytoseiulus fragariae Denmark & Schicha to control T. urticae in strawberry. At first, there was an evaluation of the predatory capacity of the predator in laboratory, through petri dishes containing leaves of jack bean, Canavalia ensiformis, and also leaflets from strawberry, in order to determine the ideal host for the development of the predator. In the second part of the study six screened greenhouses located in the “Areiao” Farm / ESALQ USP, Piracicaba-SP were used. Within these, 600 pots of strawberry were 30 A. R. MACHI, R. V. ARAUJO, G. J. MORAES, V. ARTHUR distributed homogeneously in each screened greenhouse. For infestation, five two-spotted mite adult females were transferred to each leaf piece of C. ensiformis then the infested leaf pieces were homogeneously distributed among the strawberry pots in the six screened greenhouses. Ten days after the release of the two-spotted mites, five adult females of P. fragariae were released, one by one, on half of the plants of each of the three replicates. The treatment where the predator was not released refers to treatment I, and treatment where they were released refers to treatment II. The population of each species of mites found, the percentage of infested leaves, and damage levels of the two-spotted mite were observed weekly. In three replicates of treatment I, the proportion of leaflets with two-spotted mites reached its peak in the first or second week after the release of mites. Then, the proportion of leaves attacked was greatly reduced, reaching close to zero and remained so until the twelfth or thirteenth week, when the proportion of leaves attacked increased, reaching very high levels in two or three weeks of evaluation. In general, in the first two replicates, there was not a visually obvious difference between the two-spotted mite population levels among the plants on which P. fragariae had not been released (treatment I) and those on which one predator had been released (treatment II). However, in three replicates, the sum of average population levels of mites from the beginning to the end of the experiment was always higher in treatment I than in treatment II (176 and 98, 153 and 96, and 238 and 119, from first to third replicate). The spontaneous occurrence of other mites in both treatments was identified, and those more frequent in the weekly ratings were Neoseiulus californicus and Phytoseiulus macropilis; both had little influence on the results of the experiment, and there was no difference in relation to the treatments. In accordance with the results above, in three weeks of the experiment, the sum of the damage levels of the sampled leaves was always higher in treatment I in the 3 replicates. The results suggested that P. fragariae is a promising biological control agent in protected cultivation against the two-spotted mite in strawberry." @default.
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• W103581831 date "2012-01-01" @default.
• W103581831 modified "2023-09-22" @default.
• W103581831 title "Controle biológico do ácaro rajado (Tetranychus urticae Koch) em morangueiro, utilizando o ácaro predador Phytoseiulus fragariae Denmark & Schicha (Acari: Tetranychidae, Phytoseiidae)" @default.
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