Population Dynamics of Chilli Mite and their Management with Certain Newer Insecticide Combination Formulations

Field experiments were conducted during the 2016-17 at the Vegetable Research Farm, B.H.U., Varanasi to study the population dynamics of chilli mite and evaluate the efficacy of certain newer insecticide combination formulations viz., Fipronil 5% + Buprofezin 20% SC @ 100+400g a.i./ha, Fipronil 5% + Buprofezin 20% SC @ 50+200g a.i./ha, Fipronil 5% + Buprofezin 20% SC @ 37.5+150g a.i./ha, Indoxacarb 14.5% + Acetamiprid 7.7% SC @ 58+30.8g a.i./ha, Diafenthuiron 50% WP, Buprofezin 25% SC, Fipronil 5% SC, Quinolphos 25% EC @ 750 g a.i./ha, Quinolphos @ 375 g a.i./ha with untreated control. The chilli mite population was first recorded on 38th SW with mean population of 0.75 mites per leaf and attaining its peak population 17.85 mites per leaf during 42nd SW. The correlation analysis revealed that positive significant correlation with maximum temperature and positive non-significant correlation with minimum temperature. However, negative significant correlation with morning and evening relative humidity and negative non-significant correlation with rainfall. The overall data of efficacy revealed that all insecticidal treatments were significantly superior over untreated control. However, the plots treated with Fipronil 5% + Buprofezin 20% SC @ 100+400g a.i./ha has recorded the lowest number of chilli mite population (4.44 and 2.18 mite per leaf) after first and second insecticidal sprays, respectively, followed by Fipronil 5% + Buprofezin 20% SC @ 50+200g a.i./ha (5.84 and 3.53 mite per leaf, respectively). Whereas, sole treatments of Fipronil 5% SC and Buprofezin 25% SC were recorded as third and fourth best treatments, respectively.