Action of organophosphates insecticides used to control Leucoptera coffeella (Guerin-Meneville) (Lepidoptera: Lyonetiidae) on the predator mite Iphiseiodes zuluagai Denmark & Muma (Acari: Phytoseiidae)
Chemical control has been preferentially used to suppress pests by farmers mainly due to low price of the products and immediate action on target organisms. However, wide action range of the compounds, undesirable effects on nontarget organisms and the contamination of the environment are among the disadvantages of this method of control. This study evaluated the action of the insecticides chlorpyrifos, disulfoton, ethion and methyl parathion [parathion-methyl], normally used to control the coffee leaf-miner, Leucoptera coffeella [Perileucoptera coffeella] on the predaceous mite Iphiseiodes zuluagai, a control agent of the phytophagous mites Oligonychus ilicis and Brevipalpus phoenicis in coffee (Coffea arabica cv. Catuai) plantation in Minas Gerais, Brazil. Discriminatory concentrations (LC99), established on the 3rd instar of L. coffeella, by means of the method of dry insecticide residues impregnated in filter paper, were used to verify the selectivity of the insecticides on the predaceous mite. The insecticide chlorpyrifos caused 100 percent of mortality in I. zuluagai. Ethion and methyl parathion showed mortality of 34 percent and 19 percent, respectively. Disulfoton presented the highest selectivity for the mite, with no lethal action on the predator. The different effects found on the insecticides' action show that it is possible to use the selective insecticides in coffee plantation to preserve populations of I. zuluagai, thus favouring the biological control on phytophagous mite.
| Main Authors: | , , , |
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| Format: | biblioteca |
| Published: |
2002
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| Subjects: | COFFEA, COFFEA ARABICA, OLIGONYCHUS, BREVIPALPUS PHOENICIS, PERILEUCOPTERA COFFEELLA, PHYTOSEIIDAE, AGENTES DE CONTROL BIOLOGICO, CONTROL QUIMICO, CHLORPYRIFOS, CAFE, DISULFOTON, ETION, CONTROL DE INSECTOS, INSECTOS DAÑINOS, INSECTICIDAS, RESIDUOS, CONTROL DE ACAROS, MORTALIDAD, EFECTOS SECUNDARIOS, METIL PARATION, PLAGAS DE PLANTAS, DEPREDADORES, ACARINA, MINAS GERAIS, BRASIL, |
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| Summary: | Chemical control has been preferentially used to suppress pests by farmers mainly due to low price of the products and immediate action on target organisms. However, wide action range of the compounds, undesirable effects on nontarget organisms and the contamination of the environment are among the disadvantages of this method of control. This study evaluated the action of the insecticides chlorpyrifos, disulfoton, ethion and methyl parathion [parathion-methyl], normally used to control the coffee leaf-miner, Leucoptera coffeella [Perileucoptera coffeella] on the predaceous mite Iphiseiodes zuluagai, a control agent of the phytophagous mites Oligonychus ilicis and Brevipalpus phoenicis in coffee (Coffea arabica cv. Catuai) plantation in Minas Gerais, Brazil. Discriminatory concentrations (LC99), established on the 3rd instar of L. coffeella, by means of the method of dry insecticide residues impregnated in filter paper, were used to verify the selectivity of the insecticides on the predaceous mite. The insecticide chlorpyrifos caused 100 percent of mortality in I. zuluagai. Ethion and methyl parathion showed mortality of 34 percent and 19 percent, respectively. Disulfoton presented the highest selectivity for the mite, with no lethal action on the predator. The different effects found on the insecticides' action show that it is possible to use the selective insecticides in coffee plantation to preserve populations of I. zuluagai, thus favouring the biological control on phytophagous mite. |
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