Diafenthiuron: field studies in Plutella xylostella L control in S.E. Asia 1986-88

Ellis W.W., . and Jaruek Sribuddhachart, . and Ittidet Chaimongkol, . and Hare C.J., . (1990) Diafenthiuron: field studies in Plutella xylostella L control in S.E. Asia 1986-88. [Proceedings Paper]

Field studies were undertaken over three seasons 1986-1988 in Thailand Malaysia Taiwan Indonesia and the Philippines to investigate control of Plutella xylostella in cruciferous vegetables using diafenthiuron 3-2 6-diisopropyl-4phenoxyphenyl-1- tert. butyl thiourea a novel insecticide/acaricide developed by Ciba-Geigy. An SC500 50 percent formulation was tested on Chinese kale cauliflower and head cabbage keeping as closely as possible to local farm practice. Plot sizes varied from 2 to 20 m to the power of 2 and application frequency was 3 to 7 days. Spray volume was adjusted according to crop development from 400 L/ha early stages to 1000L/ha as the crops neared maturity. Diafenthiuron was found in all countries to be superior to commercial standards including the acylureas and Bacillus thuringiensis. Bioefficacy varied from 80 to 100 percent at rates of 4-75 gai/100L. Evaluation of crop damage indicated a similar trend and diafenthiuron gave considerable increases both in total and marketable yield. In separate trials of phytotoxicity on Chinese kale and Cabbage in Thailand there was no evidence of any stunting chlorosis deformation or yield reduction at rates up to 150 g a.i./100L. It is recommended that diafenthiuron should be used as a component of an appropriate insecticide treatment strategy in order to delay or prevent resistance development by minimising selection pressure.

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Abstract

Field studies were undertaken over three seasons 1986-1988 in Thailand Malaysia Taiwan Indonesia and the Philippines to investigate control of Plutella xylostella in cruciferous vegetables using diafenthiuron 3-2 6-diisopropyl-4phenoxyphenyl-1- tert. butyl thiourea a novel insecticide/acaricide developed by Ciba-Geigy. An SC500 50 percent formulation was tested on Chinese kale cauliflower and head cabbage keeping as closely as possible to local farm practice. Plot sizes varied from 2 to 20 m to the power of 2 and application frequency was 3 to 7 days. Spray volume was adjusted according to crop development from 400 L/ha early stages to 1000L/ha as the crops neared maturity. Diafenthiuron was found in all countries to be superior to commercial standards including the acylureas and Bacillus thuringiensis. Bioefficacy varied from 80 to 100 percent at rates of 4-75 gai/100L. Evaluation of crop damage indicated a similar trend and diafenthiuron gave considerable increases both in total and marketable yield. In separate trials of phytotoxicity on Chinese kale and Cabbage in Thailand there was no evidence of any stunting chlorosis deformation or yield reduction at rates up to 150 g a.i./100L. It is recommended that diafenthiuron should be used as a component of an appropriate insecticide treatment strategy in order to delay or prevent resistance development by minimising selection pressure.

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Item Type:	Proceedings Paper
Additional Information:	5 tables 4 ref.; Summary En
AGROVOC Term:	INSECTICIDAS
AGROVOC Term:	PLUTELLA XYLOSTELLA
AGROVOC Term:	PLAGAS DE PLANTAS
AGROVOC Term:	ACARICIDAS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/14914

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