Evaluation of reduviid predators and plant products against chosen groundnut pests.
The augmentative release of a reduviid predator Rhynocoris kumraii, hot water extract of Ipomea cornea [Ipomoea carnea] and Vitex negundo were evaluated against selected groundnut pests at farmers field in Tamil Nadu, India. The results revealed that invariably endosulfan highly reduce all the pest populations. Aphis craccivora population was highly reduced by the combination of both plant extracts in equal proportion (54.40%) followed by I. cornea (48.86%) and V. negundo (37.85%). Similar observation were also observed for Helicoverpa armigera and Spodoptera litura. Both the plants have very limited impact on grasshoppers such as C. trachyterus and A. crenulata. Rhynocoris kumraii [Rhynocoris kumari] highly reduce S. litura followed by A. craccivora, H. armigera, Chrotogonus trachyterus [Chrotogonus trachypterus] and Atractomorpha crenulata. But the reduviid predator has the ability to suppress Mylabris pustulata. Among all the treatments tested, groundnut production was higher in Rhynocoris kumraii released field followed by endosulfan and the combination of both plant extracts in equal proportion sprayed plot. In general, all the treatments invariably reduce the pest populations and increase the groundnut production and hence they can be utilized and incorporated in the groundnut pests' managements.