Field Evaluation
Abstract
A total of five pests such as Aphis craccivora, Helicoverpa armigera, Spodoptera litura, Mylabris indica, and grasshoppers were recorded both in summer and kharif. However, these pest populations were drastically decreased after introduction of oligidic diet-reared predator. Among all predators recorded, Rhynocoris marginatus was the most abundant in the groundnut field. From this result, it was very clear that Rhynocoris marginatus greatly suppressed the population of Spodoptera litura, Aphis craccivora, Helicoverpa armigera, and Pericallia ricini. In summer Rhynocoris fuscipes, spiders, dragonfly, Mantisreligiosa, and Coccinella septempunctata were established. Among the two-diet regime, OD-reared Rhynocoris marginatus slightly and highly reduce the pest populations.
Production of the groundnut was high in the artificial diet-reared predator. Similarly the cost-benefit ratio was maximum in the field-released OD predator (1:2) followed by T1 (CC)-reared predator (1:1.8). Among the treatments, number of two pods was more than three pods in a groundnut plant. During summer, groundnut production was maximum in the oligidic diet-reared predator plot (1224 kg/h) followed by T1 (936.00 kg/h) and minimum in the control plot (728.00 kg/h). Same trend was also observed in kharif. During kharif, the percent avoidable loss (PAL) was maximum (23.33 %) in field-released OD-reared predator, followed by T1-reared predator released (14.81 %).
Keywords
Integrated pest management Zelus Coranus Rhynocoris Pristhesancus Economically imporant crop Cost-benefit ratioReferences
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