Succession and incidence of insect fauna on green gram

Abstract

The activity of aphid and whitefly was started from 34th SMW and continued till harvest of the crop with its peak population (21.9 and 7.5 insects/3compound leaves/plant, respectively) in 38th SMW. During present investigation the activity of jassid was started from 35th SMW and reached its peak (4.9 jassids/3 compound leaves/plant) in 40th SMW. The activity of coreid bug and flea beetle was started from 37th SMW with its peak population (2.6 and 3.5 insects/plant) in 40th SMW. Activity of Coccinellid beetle was started from 35th SMW and continued till harvest of the crop with its peak population (1.7 beetles/plant) in 38th SMW. During present investigation it was observed that the Coccinellid beetle population increased with an increase in aphid population. During present investigations significant positive correlation was observed in the population of all the insect fauna of green gram i.e. jassid, whitefly, flea beetle, coreid bud and coccinellid beetle with maximum temperature and evaporation. The positive correlation of aphid population was also observed with minimum temperature and evaporation.