Seasonal incidence of tur pod bug, Clavigralla gibbosa Spinola (Hemiptera: Coreidae) on long duration pigeonpea
Jitendra Khamoriya, Ram Keval, Snehel Chakravarty and Vijay Kumar Mishra
The present research was aimed to study the seasonal incidence pattern of tur pod bug, C. gibbosa in pigeonpea ecosystem during Kharif season of the year 2015-16 and 2016-17. The results revealed that the incidence of pod bug started from the 2nd standard week and it remained active up to 14th standard week of both the years. The C. gibbosa population attained its peak level (6.00 bugs per plant) during 9th standard week in 2015-16 while in 2016-17, population of C. gibbosa was recorded to be highest in 10th standard week (5.50 bugs per plant). Correlation studies indicated that population of C. gibbosa exhibited a significant positive correlation with maximum temperature whereas a significant negative correlation was established with average relative humidity. Other abiotic factors had no significant effect on this insect pest population. The regression equation revealed that variations of different weather variables caused approximately 82.6 and 85.6 per cent variations in C. gibbosa population during both years, respectively.