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Project description

Pheromone-Based Monitoring Systems for Major Stink Bug Pests of Agriculture in California. (97DS039)
Program UC IPM competitive research grants program
J.G. Millar, Entomology, UC Riverside
Host/habitat Tomatoes; Legumes; Tree Crops; Nuts; Cotton; Alfalfa; Berries
Pest Red-Shouldered Stink Bug Thyanta pallidovirens; Flat Green Stink Bug Acrosternum hilare; Say's Stink Bug Chlorochroa sayi; Uhler's Stink Bug Chlorochroa uhleri; Conchuela Stink Bug Chlorochroa ligata; Consperse Stink Bug Euschistus conspersus; Southern Green Stink Bug Nezara viridula
Discipline Entomology
Decision Support
Start year (duration)  1997 (Three Years)
Objectives Identify attractant pheromones for major stink bug pests in California, particularly species that infest a number of crops.
In 1999, work focused on finishing up the chemistry of several pheromones, field trials of pheromones, and field cage studies of pheromone baits. Multigram syntheses of the pheromones for A. hilare and 2 of the 3 Chlorochroa spp. were completed. In field trials, T. pallidovirens females were attracted to 2-4 component pheromone blends; attraction was species, sex, and stage specific. In contrast, pheromones attracted both sexes of C. uhleri, C. sayi, and E. conspersus. Trap catch of E. conspersus was not enhanced by addition of minor components. Field tests with A. hilare and C. ligata were not possible because for the former species, synthetic pheromone was not available until September, and for the latter, we were not able to locate populations for testing. However, C. ligata pheromone is similar to that of C. uhleri, and several C. ligata females were caught in C. uhleri field trials, even though C. ligata were not found by sweep net sampling. Field cage studies with A. hilare and N. viridula indicated that bugs responded best to pheromone baits hung on vertical plants or silhouettes, and that responding bugs stayed on or near the pheromone baits for some time.

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