Plant parasitic nematodes are one of the major constraints on yield and production of food crops throughout the world. While abamectin has broad nematicidal activity, its poor mobility in soils compromises its efficiency against nematode infestation. Using abamectin as a model pesticide, we present an innovative and cost effective approach for crop protection from plant parasitic nematodes, using a lignocellulosic matrix ‘wrap and plant’ methodology. In our ‘wrap and plant’ approach, we have used abamectin loaded matrices as wraps for seeds to be planted in the soil. To better understand the effect of various processing parameters and nature of the pulp on final properties of the matrix, we have produced lignocellulose matrices using pulp refined at various time intervals. Resulting hand sheets are characterized by the controlled release of abamectin which is incorporated into the matrices through physisorption. Pulp refining time as well as various physical and chemical properties of the matrices are found to affect its tendency to let the germinating roots penetrate it and also the release rate of abamectin. It is perceived that by varying refining time of the pulp, we can obtain matrices that facilitate in slow and sustained release of abamectin which results in long term nematicide protection to the growing plant roots. We have also observed that refining pulp for a longer time produces comparatively stronger paper which does not facilitate the plant roots penetration through the wrap, therefore negatively affecting the germination process. We have used these results to develop pilot scale paper rolls which are currently used in field trials in various regions of Africa and initial field trials demonstrate promising results regarding better crop protection in nematode infested soils in Benin.

Biodegradable matrix for sustained release of pesticides for crop protection

253rd National Meeting (2017)

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