A Model for Predicting Citrus Rust Mite 1 Damage on Valencia Orange Fruit 2

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Abstract
A model is derived for calculating the percent surface damage to Valencia oranges by populations of Phyllocoptruta oleivora (Ashmead), taking account of a seasonally-varying damage rate. Accumulated area under mite population curves (mite-days) was linearly related to accumulated damage on fruit surfaces. Linear correlations for all times of the growing season were very high (0.927–0.996). The slope of the regression of mite-days on cumulative damage increased gradually over the season from 0.001%/mite/day in spring to 0.01%/mite/day in winter. Attempts to include temperature effects by putting mites on a degree-day time scale did not produce a more constant damage rate.

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