Vol. 9, Issue 8, Part G (2025)

The field experiment was conducted at K.N.K, College of Horticulture, Mandsaur (M.P.) to study the population dynamics of aphid, jassid and lady bird beetle in 2022-23 and 2023-24. Aphid population started in 40^th SMW in 2022-23 (0.43 aphids/leaf) and 41^st SMW in 2023-24 (1.08 aphids/leaf) and it peaked in 2022-23 and 2023-24 (10.2 and 22.37aphids/leaf) during 2^nd and 4^th SMW, respectively. Jassid population was recorded on brinjal during 2022-23 & 2023-24, with 0.05 and 0.34 jassid per leaf on 41^st SMWs, respectively. Maximum population of jassid noted during 2022-23 (3.06 jassid/leaf) at 51^st SMW and in 2023-24 (3.23 jassid/leaf) on 1^st SMW. Lady bird beetles appeared 46^th and 48^th SMW with initial populations of 0.04 and 0.05 per plant, peaked at 0.68 and 1.07 per plant in 3^rd & 4^th SMW in 2022-23 and 2023-24 respectively. Highly significant negative association was observed between aphid and maximum and minimum temperature (r = -0.774 &-0.775) in both years of study. Morning relative humidity (r = 0.483**) and evening relative humidity (r = 0.432**) showed positive and significant relation in 2022-23 while, in 2023-24 evening relative humidity (r= 0.422**) obtained a significant positive correlation. In 2022-23 a negative and highly significant correlation was found between maximum and minimum temperature and the jassid population (r= -0.716, -0.651). The association of pest population was positive and significant with morning relative humidity (r= 0.427**) and evening relative humidity (r= 0.515**). In the year 2023-24 the association of pest population had a significant and positive association with evening relative humidity (r= 0.387**). Minimum and maximum temperature exhibited highly significant negative association with Coccinellids population. The interaction between aphids and Coccinellids was found to be very strong. Aphids and their predator Coccinellids showed a positive and highly significant association in 2022–2023 (r=0.78) and 2023–2024 (r=0.50).