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K. SWATHI*, P. SEETHA RAMU1, S. DHURUA2 AND M. SURESH3
Department of Entomology, Agricultural College, ANGRAU, Naira 532 185, Andhra Pradesh
A field experiment was conducted at Agricultural College Farm, Naira, on seasonal incidence of spotted pod borer on rice fallow blackgram in North Coastal Andhra Pradesh during rabi 2017-2018. The incidence of M. vitrata revealed that the initial occurrence was observed on 52nd standard week i.e., at 31DAS with a mean population of four larvae per 50 plants and reached a peak by 64 DAS (5th standard week) i.e., at pod development stage with 329 larvae per 50 plants. Thereafter the larval population declined gradually with rise in maximum and minimum temperatures and reached minimum by 80 DAS (7th standard week) with a mean of 100 larvae per 50 plants. The larval population showed negative and non significant association with minimum temperature (r = – 0.493), evening relative humidity (r= -0.218) and wind velocity (r= -0.015) while maximum temperature (r= 0.083) and mean sunshine hours (r= 0.181) has positive and non-significant while positive and significant correlation with morning relative humidity (r=
0.657).
KEY WORDS: Blackgram, seasonal incidence, spotted pod borer (M. vitrata), weather parameters,