Is there a relationship between navel orangeworm egg and male moth capture?

Monday, April 4, 2016: 2:10 PM
Moi (Pacific Beach Hotel)
Kris Tollerup , Kearney Agricultural Research and Extension Center, University of California, Parlier, CA
Roger Duncan , University of California Cooperative Extension, Modesto, CA
David R. Haviland , University of California Cooperative Extension, Bakersfield, CA
Danielle Lightle , Ag & Natural Resources, University of California, Orland, CA
Franz Niederholzer , University of California Cooperative Extension, Yuba, CA
Emily J. Symmes , Department of Entomology, University of California, Davis, CA
Frank Zalom , Entomology and Nematology, University of California Davis, Davis, CA
Currently, egg traps provide the primary monitoring tool for navel orangeworm (NOW) in almond.  Egg capture is used to establish a biofix (the first date, of two consecutive dates, on which 50% of the egg traps in a given area have an increase in egg numbers).  From biofix, a pest manager can use a degree-day (DD) model, available through the University of California, Statewide Integrated Pest Management Program, to strategically time insecticide applications.  In 2013, Suterra LLC, Bend Oregon, marketed an NOW lure containing female sex pheromone for monitoring male moths.  The lure effectively attracts male moths to sticky traps, however, we have a limited understanding of how male-moth capture and egg-laying relate.  During 2014 and 2015 we selected 18 and 14 orchards respectively, located in Kern, Fresno, Madera, Merced, Stanislaus, San Joaquin, Yolo, and Glenn counties.  At each orchard site, we deployed three trap-sets, each having four egg traps (ET) and a single pheromone trap (PT) in an ET, ET, PT, ET, ET pattern. Within trap-set and between trap-set spacing equaled approximately 30.5 and 152 m respectively.  We monitored traps twice weekly until egg biofix then once per week until late September.   During this presentation, I will discuss underlying trends between egg and male moth capture and the use of a logistic model to predict the occurrence of egg capture based on male moth capture.