Degradation of endosulfan and permethrin on sawi Brassica rapa L. - implications on insect management

Ong S.H., . (1990) Degradation of endosulfan and permethrin on sawi Brassica rapa L. - implications on insect management. [Proceedings Paper]

Declining planted acreage as a consequence of world-wide agricultural deregulation policies and the increasing awareness among consumers farmers and manufacturers to the safety and environmental consequences of insecticides are expected to produce a scenario of insecticide product attrition and development disincentives in the next 20 years for major manufacturers. These factors coupled with the escalating costs and increasing difficulty of discovering new products will call for more use of existing chemicals rather than counting on a continous flow of replacement products for future insect management. Against this backdrop a residue persistence study was conducted on sawi Brassica rapa L. using two old chemicals endosulfan and permethrin with the objectives to generate residue data for safety evaluation correlation to laboratory and field bioefficacy studies and spray programme development based on resistance management and integrated pest management principles. Depending on spray dosages used endosulfan requires waiting periods between 14-21 days before residues on sawi will drop below the maximum residue limit MRL of 2.0 mg kg-1. Data imply that endosulfan is only suitable for longer term crops where waiting periods of between 14-21 days can be practised. The maximum residue limit of permethrin at 5.0 mg kg-1 on sawi on the other hand is achievable in a much shorter waiting period of between 3-5 days. These data mean that permethrin is suitable for both short and long term crops. Although the waiting period is short it does not mean that permethrin can be applied frequently throughout the growing season. A system of insecticide rotation of permethrin with other unrelated chemicals not necessarily endosulfan pertinent to the insect situation should be adopted to encourage the practice of synthetic pyrethroid-free days. Properly done this practice has potential in prolonging the effective life of synthetic pyrethroids in general

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Abstract

Declining planted acreage as a consequence of world-wide agricultural deregulation policies and the increasing awareness among consumers farmers and manufacturers to the safety and environmental consequences of insecticides are expected to produce a scenario of insecticide product attrition and development disincentives in the next 20 years for major manufacturers. These factors coupled with the escalating costs and increasing difficulty of discovering new products will call for more use of existing chemicals rather than counting on a continous flow of replacement products for future insect management. Against this backdrop a residue persistence study was conducted on sawi Brassica rapa L. using two old chemicals endosulfan and permethrin with the objectives to generate residue data for safety evaluation correlation to laboratory and field bioefficacy studies and spray programme development based on resistance management and integrated pest management principles. Depending on spray dosages used endosulfan requires waiting periods between 14-21 days before residues on sawi will drop below the maximum residue limit MRL of 2.0 mg kg-1. Data imply that endosulfan is only suitable for longer term crops where waiting periods of between 14-21 days can be practised. The maximum residue limit of permethrin at 5.0 mg kg-1 on sawi on the other hand is achievable in a much shorter waiting period of between 3-5 days. These data mean that permethrin is suitable for both short and long term crops. Although the waiting period is short it does not mean that permethrin can be applied frequently throughout the growing season. A system of insecticide rotation of permethrin with other unrelated chemicals not necessarily endosulfan pertinent to the insect situation should be adopted to encourage the practice of synthetic pyrethroid-free days. Properly done this practice has potential in prolonging the effective life of synthetic pyrethroids in general

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	BRASSICA RAPA
AGROVOC Term:	ENDOSULFAN
AGROVOC Term:	PERMETRINA
AGROVOC Term:	DEGRADACION/ INSECTICIDAS
AGROVOC Term:	RESIDUOS
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:26
URI:	http://webagris.upm.edu.my/id/eprint/15195

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