Population Dynamics of Helicoverpa armigera on Soybean

Abstract

This study on the population dynamites of pod borer Helicoverpa armigera (Hubn.) on soybean revealed that it appeared from 29th Standard meteorological week (SMW) (0.40± 0.10 three leaves/ plant). It increased and reached its peak level of 2.67± 0.17/ 3 leaves/ plant during 33rd SMW. The declining trend was observed and reached 0.60± 0.13/ 3 leaves/ plant during 40th SMW. The peak infestation was 48% during 35th SMW. The incidence exhibited non-significant positive correlation with maximum (r= 0.227) and minimum temperature (r= 0.335) and evening relative humidity (RH) (r=0.315); and a significant positive one with morning RH (r= 0.599) and significant negative one with rainfall (r= -0.42). The sunshine was found to be negatively and non-significantly correlated (r = -0.069).

Field efficacy and economics of selected insecticides against gram pod borer [Helicoverpa armigera (Hubner)] on greengram [Vigna radiata (L.) Wilczek]

“…(2022) [6] . Imidacloprid @ 17.8% SL (1.190) was found to be the next effective treatment which is in line with the findings of Kumar et al (2020) [10] , Farooq et al (2022) [7] and Patil and Yadav (2023) [20] . Fipronil @ 5% SC (1.455) was found to be the next effective treatment which is in line with findings of Adsure and Mohite (2014) [1] , Sathish et al…”

Incidence, Infestation and Role of Weather Factors in Regulating the Population of Flea Beetle (Altica hemensis) on Soybean under Temperate Conditions

“…It harbours more than 300 insects, amongst them only a few attain major pest status. They damage the crop from seedling stage to maturity and cause nearly 25% reduction of yield [2,3]. A. hemensis results in the irregular patches of feeding damage and later a characteristic damage called skeletonization occurs whereby only hard parts of plant are left; insect will also damage flowers and small pods; pods may be damaged so badly that they drop from the plant.…”