Gyan Prakash Morya and Rajnish Kumar

The present study was undertaken to investigate the abundance of bioagents prevalent over rice insect pests associated with rice field ecosystem under changing climatic conditions of Eastern Uttar Pradesh, India. The surveillance was conducted in 03 administrative divisions namely, Gorakhpur, Basti and Azamgarh for two consecutive years, 2014 and 2015 in rainy season (Kharif). The surveillance for abundance of major bioagent species prevalent over major insect pests of rice was conducted as per methodology of agroecosystem analysis (AESA) modified as accessibility. There were 41 bioagent species observed under 03 rice growth stages of seedling, transplanting and flowering. Among 15 major bioagent species prevalent over major insect pests of rice, there were confined 10 bioagent species as predators and 5 bioagent species as parasitoids. Of the total observed population of major bioagent groups in all growth stages of rice under temperature maximum, temperature minimum, relative humidity, and rainfall, the correlation coefficients were - 0.594, - 0.573, - 0.482, and 0.762 for spiders; - 0.463, - 0.440, - 0.341, and 0.653 for mirids; -0.481, -0.458, -0.359, and 0.668 for coccinellids; -0.524, -0.502, -0.407, and 0.705 for orthopterans; -0.475, -0.452, -0.354, and 0.663 for hymenopterans; - 0.602, - 0.581, - 0.490, and 0.768 for predators; - 0.459, - 0.436, - 0.337, and 0.649 for parasitoids; and -0.552, -0.530, -0.436, and 0.728 for total population of most bioagent groups respectively. The abundance of major bioagent species was inference negative correlation with particular weather parameters, except rainfall was inference positive correlation. The population of major bioagent species were tended towards transplanting stage of rice. The total population of major bioagent species under major bioagent groups was highly increased in transplanting stage and abundant descendingly with transplanting, flowering, and seedling growth stages of rice with influence of weather parameters respectively.

DOI: 10.22271/phyto.2020.v9.i2z.14652

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