MANAGEMENT OF OMNIVOROUS LEAFROLLER
Control strategies for omnivorous leafroller have typically involved the use of cryolite, and Bt bloom sprays. The use of synthetic sex pheromones for disruption of mating is targeted at adult moths instead of hatching larvae. Accurate prediction of the emergence of moths from the overwintering populations is critical to timing CheckMate applications. The use of degree-day models, pheromone traps and field observations are helpful detecting the earliest emergence of the overwintering generation. By preventing mating and subsequent egg laying, omnivorous leafroller populations can be dramatically reduced to below economically damaging levels. In situations with high omnivorous leafroller pressure (problem blocks or some organic blocks), pheromone mating disruption and an accurately timed insecticide spray targeted at larval populations can be used together in an Integrated Pest Management strategy.

OMNIVOROUS LEAFROLLER BIOLOGY
Omnivorous leafroller overwinters in the larval stage in mummies, weeds, and other trash. In spring, larvae complete their development and moths emerge and lay shinglelike egg masses on leaves. After about 5 days these eggs hatch, and larvae web two young leaves together to form a nest in which they feed. It does not roll leaves as does the grape leaffolder; instead, it ties leaves together and feeds inside. Later, nests can be found in flower clusters (May) and bunches (June-Sept.), as well as on leaves and in shoot tips. Larvae feed on fruit surfaces, leaving irregular, shallow scars similar to orange tortrix. Larvae feed where fruit are touching, so entire clusters can be damaged. Adult flights generally occur in spring (Feb-April), late May, mid-July, and late August or early September. The first of five larval instars appears a short time after a flights.