Researchers are optimistic that obliquebanded leafroller (OBLR) can be managed in Michigan fruit production with biological control. Because it spends most of its life cycle outside the fruit (unlike other fruit pests), its exposure to natural enemies is greater than that of internal fruit feeders. OBLR populations have increased in commercial orchards over the last 30 years, largely as a result of the negative impact that conventional insecticides intended to control other pests have had on OBLR natural enemies. Without insecticides, OBLR parasitism levels range from 40-100%. A significant amount of parasitism occurs in orchards under pheromone and IGR use, even when OP's are used early in the season. In Michigan, there are many native hosts and natural habitats that can serve as a refuge for these natural enemies. A survey of leafroller parasitoids will be conducted in Michigan next year.
Wise, J. and L. Gut. 1998. Biological control of obliquebanded leafroller is ripe for success. Crop Advisory Team Alert Sept. 29, 1998 Vol. 13, No. 18., page 3.
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