Dissipation Studies of Metalaxyl M Pesticide on Potatoes In Nyandarua County, Kenya

Résumé

Vegetables are widely consumed because of the vital role they play to provide vitamins and minerals in the diet, besides supplying proteins and energy. However they are prone of attacks by various pests and diseases leading to high loses and poor quality products. The overall objective of this study was to assess whether dissipation of Metalaxyl M on potatoes in Nyandarua County was contributing to ineffective management of the crops evidenced by high loses of the crop produce irrespective of continuous application of the pesticide. We collected samples from the farms and markets analysed resides of Metalaxyl M using GC-MS. The half-life of Metalaxyl M dissipation was calculated using the Langmuir-Hinshelwood kinetic model. The results revealed Metalaxyl M dissipation half-life of 3.13 days and 3.61 days on potatoes and soil respectively. The residues of Metalaxyl M were below the limit of detection after the 7th day of application suggesting that the pesticide was no longer effective early and late bright. All the Potatoes samples collected from the three markets open air of Njabini, Kiburu and Tulaga had no residues of Metalaxyl M. Lack of integrating data on dissipation of Metalaxyl M pesticide in developing application intervals of the pesticide is contributing to ineffective control of crop pests and diseases in production of potatoes in the region.

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