Insect pest complex of Okra and their management at medium altitude hills in Meghalaya /
Kharpran, Kitdorlang
Insect pest complex of Okra and their management at medium altitude hills in Meghalaya / by Kitdorlang Kharpran. - Umiam : CPGS, CAU c2010 - [26], 118p.: ill., some col.; - [Entomology, School of Crop Protection] .
Abstract:
Insect pest complex of okra was studied by recording number of insect pests on ten randomly selected plants from each plot during 2008 - '09. The population was counted on a single leaflflower/fruit basis. The insect pests recorded were aphid (Aphis gossypii Glover), jassid (Amrasca biguttula biguttula Ishida), leaf beetle (Monolepta signata Oliv.), leaf roller (Sylepta derogata Fab.), blister beetle (Mylabris pustulata Thnb.) and red cotton bug (Dysdercus koenigii Fab.). During the year 2009 Myllocerus lineatocollis was also recorded along with other pests. The natural enemies recorded were spiders and ladybird beetles. The pests recorded at the seedling , stage were aphid, jassid and leaf beetle, whereas the pests at the vegetative stage were aphid, jassid, leaf beetle and leaf roller. At the flowering stage the pests found were aphid, jassid , leaf beetle and blister beetle, and at the fruiting stage red cotton bug appeared along with aphid, jassid, leaf beetle and blister beetle. The incidence of Myllocerus lineatocollis was recorded during vegetative stage and continued till harvest. Out of these, aphid, jassid, blister beetle and red cotton bug were the major pests whereas leaf beetle, leaf roller and Myllocerus were he minor pests. Amongst the abiotic factors, temperature and relative humidity were found to favour the incidence of jassids, whereas temperature alone favoured the incidence of Myllocerus weevils. Incidence of other pests was independent of the weather factors. The management trials with different pesticides, botanicals and microbials revealed that amongst the synthetic insecticides, imidacloprid (0.004 %) was the most effective in reducing the population of all the pests, followed by thiamethoxam, endosulfan and lambdacyhalothrin in their order of efficacy, whereas amongst the botanicals, karanjin (2 %) was found to be the most effective against aphid, neem oil (5 %) againstjassid and NSKE (5 %) against blister beetle and red cotton bug. Amongst the microbials, Verticillium lecanii (0.16 g/I) was found to be the most effective against aphid, whereas Beauveria bassiana (I mill) was most effective against jassid, blister beetle and red cotton bug. Lambdacyhalothrin and endosulfan were toxic to the natural enemies, whereas, imjdacJoprid and tbiamethoxam were less toxic to the natural enemjes. Both the botanicals and microbials were safe to the natural enemies. Among all the management techniques, midacloprid @ 0.004% was found most effective in controlling the insect pests of okra.
Includes bibliographical references.
Entomology
Okra--Insect Pest--Meghalaya
Okra--Pest control
635.64897
Insect pest complex of Okra and their management at medium altitude hills in Meghalaya / by Kitdorlang Kharpran. - Umiam : CPGS, CAU c2010 - [26], 118p.: ill., some col.; - [Entomology, School of Crop Protection] .
Abstract:
Insect pest complex of okra was studied by recording number of insect pests on ten randomly selected plants from each plot during 2008 - '09. The population was counted on a single leaflflower/fruit basis. The insect pests recorded were aphid (Aphis gossypii Glover), jassid (Amrasca biguttula biguttula Ishida), leaf beetle (Monolepta signata Oliv.), leaf roller (Sylepta derogata Fab.), blister beetle (Mylabris pustulata Thnb.) and red cotton bug (Dysdercus koenigii Fab.). During the year 2009 Myllocerus lineatocollis was also recorded along with other pests. The natural enemies recorded were spiders and ladybird beetles. The pests recorded at the seedling , stage were aphid, jassid and leaf beetle, whereas the pests at the vegetative stage were aphid, jassid, leaf beetle and leaf roller. At the flowering stage the pests found were aphid, jassid , leaf beetle and blister beetle, and at the fruiting stage red cotton bug appeared along with aphid, jassid, leaf beetle and blister beetle. The incidence of Myllocerus lineatocollis was recorded during vegetative stage and continued till harvest. Out of these, aphid, jassid, blister beetle and red cotton bug were the major pests whereas leaf beetle, leaf roller and Myllocerus were he minor pests. Amongst the abiotic factors, temperature and relative humidity were found to favour the incidence of jassids, whereas temperature alone favoured the incidence of Myllocerus weevils. Incidence of other pests was independent of the weather factors. The management trials with different pesticides, botanicals and microbials revealed that amongst the synthetic insecticides, imidacloprid (0.004 %) was the most effective in reducing the population of all the pests, followed by thiamethoxam, endosulfan and lambdacyhalothrin in their order of efficacy, whereas amongst the botanicals, karanjin (2 %) was found to be the most effective against aphid, neem oil (5 %) againstjassid and NSKE (5 %) against blister beetle and red cotton bug. Amongst the microbials, Verticillium lecanii (0.16 g/I) was found to be the most effective against aphid, whereas Beauveria bassiana (I mill) was most effective against jassid, blister beetle and red cotton bug. Lambdacyhalothrin and endosulfan were toxic to the natural enemies, whereas, imjdacJoprid and tbiamethoxam were less toxic to the natural enemjes. Both the botanicals and microbials were safe to the natural enemies. Among all the management techniques, midacloprid @ 0.004% was found most effective in controlling the insect pests of okra.
Includes bibliographical references.
Entomology
Okra--Insect Pest--Meghalaya
Okra--Pest control
635.64897