THRIPS SPECIES DIVERSITY IN COTTON ECOSYSTEM OF TAMIL NADU AND THEIR MANAGEMENT
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Authors
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K. SENGUTTUVAN*
Department of Cotton, Tamil Nadu Agricultural University, Coimbatore- 641 003
Abstract
Comprehensive study on cotton thrips diversity in cotton ecosystem of Tamil Nadu was conducted based on the
collection and the random surveys undertaken by the Department of Cotton, Tamil Nadu Agricultural University. Three
species belonging to three genera in two families of Thysanoptera order were recorded in Coimbatore cotton
ecosystem.Phylogenetic analysis and diversity indices were completed to identify the species and their variation revealed
the maximum prevalence of Scirtothrips dorsalis (3.25) followed by Thripstabaci (1.34) and Thripspalmi(0.24) which
showed high diversity of thrips species in cotton ecosystem system and the importance of its management.The dominant
species of Scirtothrips dorsalis exhibited the tendency to be the most alarming key pest of cotton in Tamil Nadu. It might
be possible that the abundance and status of diversity of thrips population could be prominent and transimit the Tobacco
Streak Virus disease in cotton. Flonicomid 50 WG @ 75 g a.i. ha-1 has recorded significantly lowest reduction of thrips
population from 7.93 to 0.40 thrips / 3 leaves followed by acephate 75 SP @ 290 g a.i.ha-1 with a population reduction from
7.93 to 0.60 thrips per leaf.
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