9/12/2023 0 Comments Download black cutwormSeveral of our agronomists at The DeLong Co. ipsilon showed 74.0-83.0 percent relationship with the cutworm population.The weather this spring has been particularly conducive to one early season corn pest: black cutworm. ![]() Multiple regression analysis of various abiotic factors with the population of A. Among the abiotic factors, maximum temperature showed significant negative correlations with the host population. Multiple regression analysis also revealed that A. Significant positive correlation was evident between the host population and the parasitism by B. ipsilon larvae and fairly synchronized with the latter ’s maximum population. The parasitism increased with the increase in population of A. Maximum parasitism (31.20 and 26.30 percent) occurred during the fourth week of January in both the study years. lateralis commenced from the third week of December in 2018 and second week of December in 2019 and continued till the early part of March in both the cropping seasons. Later it showed a declining trend till harvest. of larvae/sqm) in third week of January in 2019 and fourth week of January in 2020, respectively. ![]() The population showed a steady increase and reached a peak (13.80 no. ipsilon first appeared in the fourth week of November, 2018and second week of December, 2019. The population trend of black cutworm, Agrotis ipsilon (Hufnagel) and its larval parasitoid, Blepharella lateralis Macquart in chickpea was studied at Regional Agricultural Research Station (RARS), Shillongani, Assam during rabi, 2018-20.
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