Caracterização da cobertura de pulverização necessária para controle do ácaro Brevipalpus phoenicis (G., 1939) em citrus
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Data
2003-06-17
Autores
Ferreira, Marcelo da Costa [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo desta pesquisa foi identificar a cobertura mínima necessária ao controle do ácaro Brevipalpus phoenicis. O trabalho foi conduzido no Depto. Fitossanidade - UNESP, Jaboticabal, em frutos de laranja infestados artificialmente com ácaros criados em câmara climatizada. Testou-se o efeito residual e tópico de propargite e verificou-se que o acaricida possui ambos os efeitos. Investigou-se o efeito da cobertura de frutos com pulverização da calda dos acaricidas: cyhexatin, óxido de fenbutatina, dinocap e propargite na concentração comercial e metade desta. Verificaram-se efeitos diferenciados, sendo a maior eficiência verificada para o cyhexatin e a maior migração dos ácaros da área tratada para o óxido de fenbutatina. Neste ensaio foi confirmado que quanto maior a área do fruto tratada maior a mortalidade dos ácaros. Determinou-se, então a cobertura mínima com base no tamanho e número de gotas a ser depositada para obtenção de controle satisfatório do ácaro. Utilizou-se o acaricida propargite nas concentrações de 0,036%, 0,072%, com e sem espalhante-adesionante e 0,144% sem espalhante-adesionante. Verificou-se que a adição do espalhante-adesionante prejudicou o efeito acaricida da calda. A cobertura mínima necessária para o controle do ácaro com a calda de propargite a 0,072% determinada no trabalho, foi resultante de 18 gotas de 293 æm por centímetro quadrado.
The aim of this research work was to identify the minimum adequate spray coverage number and size to control the mite Brevipalpus phoenicis. The research was conducted at Department of Crop Protection - UNESP, Jaboticabal, using oranges artificially infested by mites reared in a controlled chamber. Residual and topical actions of propargite were tested and it was observed that the mitecide has both of effects. Effects of fruit coverage with spray of mitecides: cyhexatin, fenbutatin oxide, dinocap and propargite were investigated using the commercially recommended dosage rate and half of this dosage. It was verified that the effects varied being cyhexatin the most effective and fenbutatin oxide causing more escape of mites from treated area. In this trial was confirmed that larger the sprayed area higher was the mortality of mites. Minimum effective coverage was studied using 0.036% and 0.072% propargite solution, with and without spreader-sticker and 0.144% without the spreader-sticker. It was verified that addition of the spreader-sticker had detrimental effect on mitecide action. The minimum spray coverage to achieve control of the mite using 0.072% propargite solution determined in this work is 18 droplets of 293 æm per square centimeter.
The aim of this research work was to identify the minimum adequate spray coverage number and size to control the mite Brevipalpus phoenicis. The research was conducted at Department of Crop Protection - UNESP, Jaboticabal, using oranges artificially infested by mites reared in a controlled chamber. Residual and topical actions of propargite were tested and it was observed that the mitecide has both of effects. Effects of fruit coverage with spray of mitecides: cyhexatin, fenbutatin oxide, dinocap and propargite were investigated using the commercially recommended dosage rate and half of this dosage. It was verified that the effects varied being cyhexatin the most effective and fenbutatin oxide causing more escape of mites from treated area. In this trial was confirmed that larger the sprayed area higher was the mortality of mites. Minimum effective coverage was studied using 0.036% and 0.072% propargite solution, with and without spreader-sticker and 0.144% without the spreader-sticker. It was verified that addition of the spreader-sticker had detrimental effect on mitecide action. The minimum spray coverage to achieve control of the mite using 0.072% propargite solution determined in this work is 18 droplets of 293 æm per square centimeter.
Descrição
Palavras-chave
Acaro - Controle, Pulverização, Cítricos, Citrus, Spray application
Como citar
FERREIRA, Marcelo da Costa. Caracterização da cobertura de pulverização necessária para controle do ácaro Brevipalpus phoenicis (G., 1939) em citrus. 2003. iii, 64 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2003.