Estimation of crop loss due to insect pests in Cicer arietinum L.
Field trials were carried out in Chhattisgarh, India to assess the losses due to insect pests infesting Cicer arietinum L. at different crop stages. Survey revealed that much of the damage to the pods was caused by H. armigera. Percent pod damage by pod borer, Helicoverpa armigera (Hub) might generally approximate the percent yield loss, while for pests like semilooper, Autographa nigrisigna which tended to attack only 5 to 10 pods per meter row, the extent of loss might be half or less the percent pod damage. Much of the insect damage in this crop, however, occurred in the reproductive phase. The extent of losses due to pests was also assessed by comparing the yields in plots protected from pests by insecticides and with those without such protection. The time of initiation of H. armigera infestation in the field influenced the crop yield to a great extent.