Population dynamics of major sucking insect pests on chilli (Capsicum annum L.)

Abstract

Studies on population dynamics of major sucking insect pests revealed that the incidence of thrips, Scirtothrips dorsalis (Hood), whitefly, Bemisia tabaci (Gennadius) and leafhopper, Amrasca bigutulla bigutulla (Ishida) along with ladybird beetle, Coccinella septemtheirpunctata observed to appear on the chilli crop soon after transplanting. Incidence of thrips commenced in 19th Standard Meteorological Week (SMW) and attained its peak on 25th SMW (18.83 thrips /3 leaves /plant) while an infestation of whitefly was initiated in 20th SMW then it increased gradually and reached its peak on 25th SMW (21.20 whitefly/3 leaves /plant). The peak population of leafhoppers was recorded in 26th SMW (10.4 leafhopper /3 leaves /plant). In case of ladybird beetle, the population ranged from 0.20 to 0.93 per plant and was on the entire crop growth period (18th-37th SMW). Thrips and whitefly exhibited a highly significant positive correlation with maximum temperature, a negative non-significant correlation with evening relative humidity, and a non-significant correlation with wind speed, sunshine hours, and pan evaporation while a negative non-significant correlation with rainfall. Leafhopper population showed highly significant positive correlation with minimum temperature, non-significant negative correlation with maximum temperature, non-significant positive correlation with morning and evening relative humidity, sunshine hours, and rainfall while the negative non-significant correlation with wind speed and pan evaporation. Whereas, the ladybird beetle exhibited a positive non-significant correlation with maximum temperature, wind speed, sunshine hours and a negative non-significant correlation with minimum temperature, morning and evening relative humidity, pan evaporation, and rainfall.

Seasonal Incidence of Major Insect Pests of Chilli and Their Correlation with Weather Parameters

“…The findings are also supported by Mondal [2] who found significant negative correlation of thrips population with relative humidity in chilli. Yadav [17] found significant negative correlation of thrips with morning relative humidity but non-significant negative correlation with evening relative humidity.…”

Eco-friendly management of sucking pest complex of chilli, (Capsicum annuum L.)

“…Vegetable constitutes an important part of our food, which supply vitamins, carbohydrates and minerals needed for a balanced and healthy diet. Among them, Chilli, (Capsicum annuum L.) is most economically important and popular vegetable crops grown for its green fruit as vegetable and red fruit as a spice (Yadav et al 2022) [9] . Chilli is grown throughout the year as a cash crop and used in green and red ripe dried stage for its pungency and colour in all culinary preparations of rich and poor alike impart the taste, flavour and colour.…”