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A new description for crop pests——Pest Attack Index (PAI) the definition and its use

Tang Jin

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Abstract

Crop Pest Attack Index (PAI) is a new method to describe damaging risks of crop disease and insect pests which predigests both pest density and occurrence area as a single digital exponent. PAI could be calculated by the equation as follows: PAI=Id·Ia. Here, Id is the ratio of real time pest population density with the pest's economical threshold (ET) or the average of population densities of past years and Ia is the ratio of real time pest occurrence area with the average of occurrence areas of past years. PAI was also used to plot out the degree of pest attacking to crops.

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What this paper is about

Crop Pest Attack Index (PAI) is a new method to describe damaging risks of crop disease and insect pests which predigests both pest density and occurrence area as a single digital exponent. PAI could be calculated by the equation as follows: PAI=Id·Ia. Here, Id is the ratio of real time pest population density with the pest's economical threshold (ET) or the average of population densities of past years and Ia is the ratio of real time pest occurrence area with the average of occurrence areas of past years. PAI was also used to plot out the degree of pest attacking to crops.

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Available abstract

Crop Pest Attack Index (PAI) is a new method to describe damaging risks of crop disease and insect pests which predigests both pest density and occurrence area as a single digital exponent. PAI could be calculated by the equation as follows: PAI=Id·Ia. Here, Id is the ratio of real time pest population density with the pest's economical threshold (ET) or the average of population densities of past years and Ia is the ratio of real time pest occurrence area with the average of occurrence areas of past years. PAI was also used to plot out the degree of pest attacking to crops.

Key concepts: PEST analysis, Crop, Population density, Population, Statistics, Mathematics, Agronomy, Biology

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