Bait formulations and longevity of navel orangeworm egg traps tested
L.P.S. (Bas) Kuenen, Agricultural Sciences Center
Walt Bentley, UC Kearney Agricultural Center
Heather C. Rowe, UC Davis
Brian Ribeiro, UC Statewide IPM Project
California Agriculture 62(1):36-39. DOI: 10.3733/ca.v062n01p36.
Standardization of pest monitoring practices and materials to maximize sensitivity to pest populations in the field is a foundation of effective integrated pest management (IPM). In response to changes in the availability of commercial bait material for navel orangeworm (NOW) egg traps, we evaluated potential alternative bait materials for use in monitoring this key pest of almonds, pistachios, walnuts and figs. Navel orangeworm egg traps baited with uninfested nutmeats were as effective as almond meal plus 10% crude almond oil, whereas traps baited with freeze-killed, navel orangeworm-infested nutmeats were less effective. The use of nut mummies (culled during winter orchard sanitation) as trap bait may not produce consistent results since the level of navel orangeworm infestation of these nuts is typically unknown. Three seasons of field tests showed that egg traps baited with almond meal plus 3% or 10% crude almond oil received similar numbers of navel orangeworm eggs, and these traps were equally effective for at least 10 weeks.
L.P.S. (Bas) Kuenen is Research Entomologist, U.S. Department of Agriculture Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, Parlier; W. Bentley is IPM Entomologist, UC Statewide IPM Project, UC Kearney Agricultural Center, Parlier; H.C. Rowe is Graduate Student, Department of Plant Sciences, UC Davis; B. Ribeiro is Staff Research Assistant, UC Statewide IPM Project. This research was supported in part by grants from the California Pistachio Commission. We thank all our cooperating growers for access to their orchards.