Abstract
Tea Mosquito Bug, Helopeltis antonii Signoret is an emerging pest of guava which causes severe qualitative yield loss to the farmers. During its feeding on guava, it injects a toxin through its saliva, which causes necrotic spots in leaves, twigs and corky outgrowth over fruits. Two field trials were carried out during 2019–2020, to access the efficacy of bio-rationales against guava tea mosquito bug in the farmer’s fields at Andipatti and Natham, Tamil Nadu, India. Regardless of locations, tea mosquito bug population reduction in Lecanicililum lecanii 106 CFU/ L at 5 g/ ml was higher followed by Metarhizium anisopliae 108 CFU at 8 g/ L. The efficacy of Azadirachtin 10,000 ppm at 2 ml/ L, NSKE 5% and pungam oil 3% were moderate. Neem oil 3% and fish oil rosin soap were highly ineffective. The efficacy of bio-rationals was much pronounced at 14 Day after Spraying (DAS) in the best treatments. From the present investigation it is evident that L. lecanii 106 CFU/ lit at 5 g/ ml was effective against H. antonii followed by M. anisopliae 108 CFU at 8 g/ lit. The efficacy of Azadirachtin 10,000 ppm at 2 ml/ lit, NSKE 5% and pungam oil 3% were moderate.
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Abbreviations
- TMB:
-
Tea Mosquito Bug
- RBD:
-
Randomized Block Design
- LSD:
-
Least Significant Difference
- L. lecanii :
-
Lecanicillium lecanii
- M. :
-
Metarhizium anisopliae
- H. antonii :
-
Helopeltis antonii
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The Authors would like to thank farmers for providing field to facilities research throughout the course of investigation.
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KA performed the idea of this article and wrote the manuscript. KS and SM provided the materials with guidance to conduct the experiment. Also helped in writing and correcting the article. Hence all authors equally contributed towards the experiments. The authors read and approved the final manuscript.
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K, A., K, S. & S, M. Efficacy of bio-rationales against tea mosquito bug, Helopeltis antonii Signoret in guava. Int J Trop Insect Sci 42, 3869–3875 (2022). https://doi.org/10.1007/s42690-022-00912-5
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DOI: https://doi.org/10.1007/s42690-022-00912-5