"The western
striped and western spotted cucumber beetles both occur in Utah, and feed on
leaves, flowers, and fruit rinds. Both species begin activity in the spring,
and are around for most of the summer. They are in their second generation now,
actively feeding on the skins of watermelon, cantaloupe, zucchini, winter
squash, pumpkin, and cucumber. The ripest vegetables are most attractive to
feeding.
The first step in
managing these beetles is to monitor for their presence. Examine all plant
parts including undersides of leaves, at least once/week, starting when
vegetables begin to ripen. No thresholds have been set for mature plants, but
in general, 4-5 beetles per plant may warrant attention. Keep in mind that most
mature plants can support substantial numbers without serious damage.
Three alternatives to an
insecticide application are to hand pick beetles (and drop in soapy water), use
strips of yellow sticky traps baited with a cotton ball soaked in clove or
cinnamon oil, or spray the plants/melons with Surround (kaolin clay), which
acts as a deterrent."- Utah State Extension Small Fruits and Vegetable IPM
Advisory
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