author(s)
Pooja Sharma, BS Rana, Azad Mordia and Kavita Kumawat

abstract
The present research was aimed to study the seasonal incidence pattern of aphid, jassid, whitefly, thrips in cowpea ecosystem during kharif season of the year 2015-2016. The result revealed that the incidence of aphid started from the second week of August (33 SMW) with a mean population of 9.6 aphids/ plant. The population increased gradually and attained its peak with a mean of 21.67 aphids/ plant during the second week of October (41 SMW). The infestation of jassids and whitefly commenced in the first week of August (32 SMW) with a mean population of 0.87 jassids/ plant and 0.60 whiteflies/ plant. The population increased gradually and touched its peak with a mean of 11.20 jassids/ plant and 5.87 whiteflies/plant during the third week of September (38SMW). The infestation of thrips started in the fourth week of August (35 SMW) with a mean population of 3.87 thrips/flower. The population increased gradually and recorded its peak with a mean of 5.20 thrips/flower during the second week of September (37 SMW). The aphid population showed negative significant correlation with rainfall. However the population of whitefly and jassid showed positive significant correlation with temperature and whitefly showed negative significant correlation with rainfall.