Effect of Citrus Rust Mite Damage on Citrus Fruit Growth12

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Abstract
Weight per fruit at harvest was negatively correlated with damage by Phyllocoptruta oleivora (Ashmead) for ‘Valencia’ and ‘Pineapple’ oranges and for ‘Duncan’ grapefruit. For all 3 varieties, soluble solids and % acid were positively correlated with citrus rust mite damage. The transverse diameters of Duncan grapefruit with the same initial diam and different amounts of citrus rust mite damage were found to diverge with time. Damaged fruit grew slower, and its final diam was less than that for undamaged fruit. The amount of rust mite damage (D) (% of surface), (t) (day of the year) and diam (d) (cm) of Duncan grapefruit were related by d = (24.5/(D−105.5) + 10.6)/(1 + exp(aD−bt)) where aD is given by aD= bto + In (kD/ko(1 + exp (ao−bto))−1). kD, the final diam (cm) of fruit with D% of the surface damaged is given by kD = 24.5/(D−105.5) + 10.6. to is the day of the year at which the damage occurred, and ao and b are constants to be determined from the growth of undamaged fruit.

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