Vol. 16 No. 1
Effect of environmental factors on the seasonal incidence and infestation of Leucinodes orbonalis Guenee in summer brinjal under North Central Plateau Agro-climatic Zone of Odisha
Abstract: The seasonal incidence and damage intensity of Leucinodes orbonalis and their relationship with different weather parameters was observed during the summer seasons of 2010 and 2011 at Keonjhar, Odisha. The peak moth activity was recorded during 14th and 19th SMW in 2010 and during 13th and 19th SMW in 2011, whereas, the maximum larval population of L. orbonalis was observed one week after the maximum adult activity in each case. The shoot damage was initiated from 4th SMW in both the years and the highest shoot damage was observed during 13th SMW in 2010 and during 12th SMW in 2011. However, the peak infestation on flower buds and fruits occurred during 15th and 20th SMW in 2010 and on 14th and 20th SMW during 2011, respectively. In all the cases the peak incidence and infestation stage has coincided with higher atmospheric temperature. From the correlation study it was established that all the temperature factors (maximum, minimum and average) influenced positively and relative humidity had a negative influence on the population build up and infestation of L. orbonalis. Besides, among the environmental parameters temperature and relative humidity had maximum contribution towards the variation in the incidence and infestation of Leucinodes orbonalis.
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