Correlation of Spray Coverage Ratings, and Phosmet Residues with Mortality of Oriental Fruit Moth Larvae1

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Abstract
Spray coverage, as evaluated by fluorescent dye deposits and phosmet residues, was correlated with mortalities of 1st instars of Grapholitha molesta (Busck) placed on field-sprayed peach foliage. Higher volumes per ha resulted in the highest and most uniform coverage ratings. Residue deposits were highest at highest application rates, but the relationship was not proportional. Mortality of Oriental fruit moth larvae was higher throughout the test period at higher application rates. A residue decay-rate model, which incorporated several cumulative environmental factors, gave a better correlation than did an asymptotic regression model. Larval mortality was expressed as a linear function of coverage rating.

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