International Journal of Farm Sciences
Year : 2016, Volume : 6, Issue : 2
First page : ( 163) Last page : ( 168)
Print ISSN : 2229-3744. Online ISSN : 2250-0499.

Bioefficacy of diafenthiuron 50 WP against cardamom thrips, Sciothrips cardamomi Ramk

Ranjith M*, Krishnamoorthy SV

Tamil Nadu Agricultural University, Coimbatore-641003, Tamil Nadu, India

*Email forcorrespondence: entoranjith@gmail.com

Online published on 25 July, 2018.

Abstract

Diafenthiuron 50 WP, a thiourea compound was tested for its efficacy against cardamom thrips, Sciothrips cardamomi, Ramk at two locations viz Murukkadi and Onnamile, Idukky district, Kerala. At Murukkadi diafenthiuron 50 WP new source (NS) @ 800 g ai/ha 30 days after application (DAA) of third spray resulted in per cent capsule damage of 2.39 which was on par with diafenthiruon 50 WP (NS) @ 400 g ai/ha and diafenthiruon 50 WP existing source (ES) @ 400 g ai/ha which gave a per cent damage of 2.51 and 2.64 respectively. Standard checks quinalphos 25 EC @ 150 g ai/ha and phenthoate 50 EC @100 g ai/ha resulted in damage of 10.25 and 8.70 per cent respectively 30 DAA after third spray. The trend continued to be the same at second location Onnamile where diafenthiuron 50 WP (NS) @ 800 g ai/ha recorded a per cent reduction of 85.81 closely followed by diafenthiuron 50 WP (NS) @ 400 g ai/ha and diafenthiuron 50 WP (ES) @ 400 g ai/ha which resulted in reduction of 84.90 and 83.27 per cent respectively. Difenthiuron 50 WP (NS) @ 300 g ai/ha recorded 78.22 per cent reduction while diafenthiuron 50 WP (NS) @ 200 g ai/ha gave 71.70 per cent reduction over check. The order of effective treatments was diafenthiuron 50 WP (NS) @ 800 g ai/ha >diafenthiuron 50 WP (NS) @ 400 g ai/ha >diafenthiuron 50 WP (ES) @ 400 g ai/ha >diafenthiuron 50 WP (NS) @ 300 g ai/ha >phenthoate 50 EC @100 g ai/ha >diafenthiuron 50 WP (NS) @ 200 g ai/ha >quinalphos 25 EC @ 150 g ai/ha.

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Keywords

Diafenthiuron, Sciothrips cardamomi, bioefficacy, capsule damage.

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