Author(s):

Kiran Bala, AK Sood, Vinay Singh Pathania and Sudeshna Thakur

Abstract: Nutrition concerns the chemicals required by organism for its growth, tissue maintenance, reproduction and necessary to maintain these functions. It may determine resistance or susceptibility to pests. Among several plant nutrients, only 17 are essential for proper growth and development of plants and each nutrient plays important role in their growth. These nutrients are required by insects for their growth, tissue maintenance, reproduction and energy. They fulfill their requirements through feeding on plants. Nitrogen has positive effects on individual insect performance, probably due to deposition-induced improvements in host plant chemistry. These improvements include increased nitrogen and decreased carbon-based defensive compound concentrations. Potassium provides high resistance against insect–pests. High levels of potassium enhance secondary compound metabolism, reduce carbohydrate accumulation and plant damage from insect pests. Phosphorus also decreases the host suitability to various insect-pests. Secondary macronutrients and micronutrients like calcium, zinc and sulphur also reduce the pest populations. Among mineral elements, silicon is involved in plant resistance against insect pest damage. The indirect effects of fertilization practices acting through changes in the nutrient composition of the crop have been reported to influence plant resistance to many insect pests. The need for more healthful foods is stimulating the development of techniques to increase plant resistance to phytophagous insects.

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