Field efficacy ofIsaria fumosoroseaalone and in combination with insecticides againstAleurodicus rugioperculatuson coconut

Autor: Sandeep, A., Selvaraj, K., Kalleshwaraswamy, C. M., Hanumanthaswamy, B. C., Mallikarjuna, H. B.
Zdroj: Egyptian Journal of Biological Pest Control; December 2022, Vol. 32 Issue: 1
Abstrakt: Background: The rugose spiraling whitefly (RSW), Aleurodicus rugioperculatusMartin (Hemiptera: Aleyrodidae), an exotic polyphagous pest and its infestation was documented on coconut (Cocos nuciferaL.) for the first time in India during 2016. RSW has attained a serious pest on many economically important crop plants due to its damage severity and rapid spread across the country in a short span of time. Hence, an attempt was made to evaluate the efficiency of the entomopathogenic fungus (EPF), Isaria fumosoroseaalone as well as in combination with a reduced dose of few insecticides against RSW on coconut to devise a sustainable integrated pest management module. Thirty-two randomly selected RSW-infested coconut palms were labelled, and eight treatments with four replications were used in a randomized complete block design during the summer months (April and May) during 2021. Two sprays were performed at 15-day intervals, at a rate of 5 L/palm, and observations on infestation/palm (%), intensity (%) and mean live colonies of RSW were recorded. Results: The results revealed that the combination of I. fumosorosea(ICAR-NBAIR Pfu-5) @ 5 ml/l + profenophos 50 EC @ 2 ml/l spray significantly reduced per cent infestation of RSW (82.97%), per cent intensity of RSW (80.49%) and mean RSW live colonies (79.68%) followed by combination of I. fumosorosea(ICAR-NBAIR Pfu-5) @ 5 ml/l + buprofezin 25% SC @ 1.25 ml/l spray significantly reduced per cent infestation of RSW (79.35%), intensity of RSW (74.79%) and mean RSW live colonies (74.20%) over I. fumosorosea(ICAR-NBAIR Pfu-5) @ 5 ml/l alone and untreated control. A combination of I. fumosorosea(5 ml/l) + profenophos 50 EC (2 ml/l) spray twice at an interval of 15 days was found effective in reducing the RSW population on coconut. Conclusions: The present study concludes that the RSW can be controlled effectively by I. fumosoroseaalone and in combination with novel insecticides at a reduced rate which showed better toxicity, ovicidal action and preserve natural enemies and reduced environmental load of chemical pesticides.
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