MONITORING OF INSECTICIDE RESISTANCE IN COTTON LEAFHOPPER, Amrasca biguttula biguttula (Ishida) AND ITS MANAGEMENT
KrishiKosh
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Title |
MONITORING OF INSECTICIDE RESISTANCE IN COTTON LEAFHOPPER, Amrasca biguttula biguttula (Ishida) AND ITS MANAGEMENT
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Creator |
MALYADRI, M
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Contributor |
PRASADA RAO, G.M.V.
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Subject |
cotton, insecticides, sowing, monocrotophos, seed treatment, toxicity, concentrates, pesticide resistance, crops, biological phenomena
INSECTICIDE RESISTANCE, COTTON LEAFHOPPER, Amrasca biguttula biguttula (Ishida) |
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Description |
Studies on “Monitoring of insecticide resistance in cotton leafhopper, Amrasca biguttula biguttula (Ishida) and its management” was taken up during kharif 2010 to determine the insecticide resistance in cotton leafhopper to major insecticides viz., monocrotophos, dimethoate, acephate, imidacloprid, acetamiprid, thiamethoxam and fipronil and to manage it. The population of cotton leafhopper was tested against test insecticides viz., monocrotophos, dimethoate, acephate, imidacloprid, acetamiprid, thiamethoxam and fipronil following the leaf dip method. The mortality data was subjected to probit analysis and the LC50 and LC90 values were calculated. The LC90 values were also compared with the recommended concentrations of the respective insecticides (AICCIP, 2010). The relative degree of resistance acquired by leafhopper population to monocrotophos, imidacloprid and thiamethoxam was calculated by comparing the LC50 values with values of kharif 1999 reported by Chalam and Subbaratnam (1999). At LC50 cotton leafhopper developed 16.67 and 47.50 fold resistance to imidacloprid and thiamethoxam and there was no resistance to monocrotophos. Dimethoate and fipronil were seven times more toxic than monocrotophos while acephate, imidacloprid, acetamiprid and thiamethoxam were less toxic than monocrotophos at LC50. Dimethoate and fipronil were 7.04 and 2.47 times more toxic while acephate, imidacloprid, acetamiprid and thiamethoxam were less toxic than monocrotophos at LC90. The order of toxicity of insecticides at LC50 is dimethoate ≥ fipronil > monocrotophos > acephate > imidacloprid > thiamethoxam > acetamiprid and at LC90 it is dimethoate > fipronil > monocrotophos > imidacloprid > acephate > thiamethoxam > acetamiprid. In the management trial, the efficacy of insecticides against cotton leafhopper was studied. The experiment was laid out with eleven treatments including untreated control and replicated thrice in a simple Randomized Block Design. The treatments were imposed four times with an interval of 10 days. The incidence of leafhoppers per three leaves per plant was recorded on five randomly selected plants per plot one day before and 1st, 3rd, 7th and 10th day after treatment. All the insecticides tested were significantly superior over untreated control by recording lower leafhopper population except T1 (Seed treatment with imidacloprid 70 WS 5 g/kg) and T2 (Seed treatment with imidacloprid 70 WS 5 g/kg + stem application with monocrotophos 36 SL (1:4)) which were at par with untreated control. Among the different treatments tested T7 (Seed treatment with imidacloprid 70 WS 5 g/kg + stem application with monocrotophos 36 SL (1:4) and spraying of imidacloprid 17.8 SL @ 0.5 ml/l + spraying of acephate 75 SP @ 1.5 g/l + spraying of fipronil 5 SC @ 2 ml/l) was found to be superior against leafhoppers, followed by T5 (Seed treatment with imidacloprid 70 WS 5 g/kg + stem application with monocrotophos 36 SL (1:4) + spraying of fipronil 5 SC @ 2 ml/l) and are at par with the remaining treatments. Highest yield of 1497 kg/ha was recorded in T7 (Seed treatment with imidacloprid 70 WS 5 g/kg + stem application with monocrotophos 36 SL (1:4) and spraying of imidacloprid 17.8 SL @ 0.5 ml/l + spraying of acephate 75 SP @ 1.5 g/l + spraying of fipronil 5 SC @ 2 ml/l) and is significantly at par with remaining treatments except, T1(Seed treatment with imidacloprid 70 WS 5 g/kg), T2 (Seed treatment with imidacloprid 70 WS 5 g/kg + stem application with monocrotophos 36 SL (1:4)) and untreated control which were significantly inferior to all other treatments. |
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Date |
2016-06-06T10:01:32Z
2016-06-06T10:01:32Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66800
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Language |
en
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Relation |
D9045;
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Format |
application/pdf
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