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bioRxiv · 10.1101/2021.06.22.449356

Biorational Management And Mycosis Studies Of Grape Thrips

Reddy, J. A.
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Abstract

Field experiment was conducted to test the bioefficacy of various biorational insecticides against grapevine thrips at AICRP on Fruits, Department of Horticulture, MPKV, Rahuri, during 2017-18. Results revealed that standard check emamectin benzoate 5% SG consistently proved to be the most promising by recording the least thrips population (3.10/shoot). Among biorational insecticides neem oil 2% (4.09/shoot) proved as best treatment followed by, karanj oil (4.51/shoot) and neemazol (5.08/shoot). While entomopathogenic fungi Lecanicillium lecanii recorded less population (4.24/shoot) and emerged as best treatment as compared to the Metarhizium anisopliae (4.87/shoot) and Beauveria bassiana (5.34/shoot). However chlli methanolic extract (6.29/shoot), garlic methanolic extract (6.78/shoot), chilli water extract (6.85/shoot) and garlic water extract (7.08/shoot) are the least effective treatments. Incremental Cost Benefit Ratio (ICBR) in respect of different treatments ranged between 1.30 to 7.92. The highest ICBR of 1:7.92 was recorded in the treatment with emamectin benzoate 5 SG, and it was followed by Lecanicillium lecanii (1:6.34) and Metarhizium anisopliae (1:5.32). Although neem oil and karanj oil has great reduction of thrips population, but has less incremental cost benefit ratio i.e. 2.81 and 3.04, respectively, due to high dose and its cost. The mycosis test of three entomopathogenic fungi viz. Beauveria bassiana, Metarhizium anisopliae, Lecanicillium lecanii were studied on grape thrips. Mycosis by Beauveria bassiana was confirmed the pathogenicity of entomopathogenic fungi on grape thrips. Highly pronounced mycosis was observed by Metarhizium anisopliae on the dead bodies of thrips. Mycosis test of Lecanicillium lecanii was also proved on grape thrips (plate - 1, 2 and 3). O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=86 SRC="FIGDIR/small/449356v1_figP1.gif" ALT="Figure 1"> View larger version (51K): org.highwire.dtl.DTLVardef@ce72dorg.highwire.dtl.DTLVardef@11d5d3borg.highwire.dtl.DTLVardef@d3fc3forg.highwire.dtl.DTLVardef@155a62a_HPS_FORMAT_FIGEXP M_FIG O_FLOATNOPlate 1:C_FLOATNO Mycosis of B.eauveria bassiana on grape thrips C_FIG O_FIG O_LINKSMALLFIG WIDTH=188 HEIGHT=200 SRC="FIGDIR/small/449356v1_figP2.gif" ALT="Figure 2"> View larger version (97K): org.highwire.dtl.DTLVardef@104ea8org.highwire.dtl.DTLVardef@9c124corg.highwire.dtl.DTLVardef@754939org.highwire.dtl.DTLVardef@1a7d04_HPS_FORMAT_FIGEXP M_FIG O_FLOATNOPlate 2:C_FLOATNO Mycosis of Metarhizium anisopliae on grape thrips C_FIG O_FIG O_LINKSMALLFIG WIDTH=200 HEIGHT=186 SRC="FIGDIR/small/449356v1_figP3.gif" ALT="Figure 3"> View larger version (85K): org.highwire.dtl.DTLVardef@105cf36org.highwire.dtl.DTLVardef@66ebfborg.highwire.dtl.DTLVardef@10ede35org.highwire.dtl.DTLVardef@11e942c_HPS_FORMAT_FIGEXP M_FIG O_FLOATNOPlate 3:C_FLOATNO Mycosis of Lecanicillium lecanii on grape thrips C_FIG

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Reddy, J. A.. 2021-06-22. Biorational Management And Mycosis Studies Of Grape Thrips. https://doi.org/10.1101/2021.06.22.449356

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