Kumar, ManojSONBA, KALBANDE SACHIN2023-03-032023-03-032021M/Ento./336/2019-20https://krishikosh.egranth.ac.in/handle/1/5810194745The present investigation entitled "Population Dynamics and Management of Major insect pests of cowpea (Vigna unguiculata L.)" was studied in summer 2020-21 in the field of Vegetable Research Plot of Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur) Bihar. In the course of investigation, the study of population dynamics of insect pest infesting cowpea revealed that the pest population exhibited significant an non-significant relationship with Standard Meteorological Week (SMW). The major insect pests attacking cowpea are aphids and spotted pod borers. The incidence of aphids were noticed from 10th SMW which was (1.90 aphids/10 cm twig) while the peak activity recorded at 16th SMW (22.21 aphids /10 cm twig) later on the population started decreasing by the maturity indices of the crop, while in spotted pod borer the incidence was noticed from the 11th SMW (1.21 larvae /plant) the peak population recorded in 14th SMW (3.86 larvae /plant) afterwards it has started gradually decreasing. The correlation studies with insect pest population in association with weather factors where aphids were significantly and positively correlated (0.766**) with maximum temperature whereas positively and non-significantly correlated (0.536NS) with minimum temperature, while significant & negative correlation (-0.603*) with morning RH whereas non-significantly and negatively correlated (-0.434NS), (-0.010NS) with evening RH and rainfall, respectively. The investigations on insecticidal efficacy of different treatments on mean population of aphids the treatment chlorantraniliprole + thiamethoxam @ 90 g a.i. / ha was seemed to be highly effective treatment which counted least number of pest population (4.17) followed by the next productive application was acetamiprid 20% SP where the lesser population was counted (6.10/10 cm twig). This was found statistically at par with thiamethoxam 25 WG recorded (7.12 aphids per 10 cm twig) followed by spinosad 45% SC, which recorded (8.38 aphid population). flubendiamide (9.57 aphids) > chlorantraniliprole (11.58 aphids) which was better than control (untreated plot).EnglishThesis