The Pickleworm: Laboratory Rearing and Artificial Infestation of Cucumhers1

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Abstract
A procedure was developed for rearing Diaphania nitidalis (Stoll) in the laboratory and for establishing artificial infestations on cucumber plants. From 24 to 57% of the larvae survived when they were placed on the growing tips of ‘Addis’ cucumber plants inside a screenhouse; 29–57% of those were recovered from the fruit. A system of visually rating plant damage from 1 to 5 (5 = heavily damaged) was developed for use in screening cucumber lines for resistance to pickleworm damage. The correlation coefficient between infestation levels and plant damage ratings for all plants tested was 0.783 (P=0.01). About 120 larvae/plant were required to produce a damage rating of 4 on mature Addis cucumber plants.

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