Gyan Prakash Morya and Rajnish Kumar

The present study was undertaken to investigate the abundance of insect pest species associated with rice field ecosystem under changing climatic conditions of Eastern Uttar Pradesh of 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 insect pest population in rice field was conducted as per methodology of agro ecosystem analysis (AESA) modified as accessibility. There were 38 insect pest species observed under 03 rice growth stages of seedling, transplanting and flowering. Among 12 major insect pest species of rice observed significant damage above 10% infestation, there were confined 7 insect pest species as very serious (10- 15% infestation) and 5 insect pest species as most serious (> 15% infestation). Of the total observed population of major insect pests under damaging groups in all growth stages of rice under temperature maximum, temperature minimum, relative humidity, and rainfall, the correlation coefficients were - 0.732, - 0.715, - 0.635, and 0.868 for stem borers; 0.989, 0.992, 0.999, and - 0.929 for leaf feeders; -0.326, -0.302, -0.198, and 0.533 for sap feeders; 0.244, 0.219, 0.113, and - 0.459 for root feeders; and 0.509, -0.170, -0.274, and - 0.299 for total population of all damaging groups respectively. The abundance of major insect pests under damaging groups was inference non-significant correlation with particular weather parameters in all growth stages of rice, except relative humidity was inference significant with insect pest population of leaf feeders damaging group. The population of stem borers and leaf feeders was highly correlated with rainfall, but the stem borers were correlated positively and leaf feeders were correlated negatively. The total population of major insect pests of rice were abundant descendingly with transplanting, flowering, and seedling growth stages of rice respectively.

DOI: 10.22271/phyto.2020.v9.i2z.14651

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