Elkins, Rachel B.

Shorey, Harry H.

Undetermined

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7. Mating Disruption/SIRMATING DISRUPTION OF CODLING MOTH USING "PUFFERS"Rachel B. ElkinsUniversity ofCalifornia Cooperative Extension883 Lakeport Blvd.Lakeport, CA 95453Harry H. ShoreyDepartment ofEntomologyUniversity of CaliforniaRiverside, CA 92521In 1996, a 160-acre trial was initiatedto test a novel, economical dispenser - "puffers".Puffers areplastic devices containing a pressurized aerosol can filled with pheromone. Atimer triggers a plunger to opena valve, releasing a givenamount of pheromone at a presettime interval.Puffers full of the codlingmoth (CM) pheromone codlemone and butane propellent wereapplied to 160 acres ofBartlett pears in Kelseyville, California on April 16. Devices wereplaced every 35 feet around the perimeter of the site, with some additional ones within thesite; application rate was 1 per 1.3 acres. Pheromonewas releasedevery 25 minutes fromApril through September. All dispensers were replacedJune 1; the butane was replacedwithan experimentalpropellent and OBLRpheromonewas added. Upwind units were againreplaced in late July due to propellent interferencewith emissionduring a prolongedheatspell. On all but 156 acres, the normal CM control program was carried out in addition tothe pheromone. Four 1-acre plots in the center of the sitewere left untreatedexceptforpheromone. Numerous 1mg., 10mg.,and OBLRtrapswereplaced throughoutthe site, aswell as in two upwind standard program orchards.Trap catches, CM eggs and fruit damage (1st generation, preharvest, bin and postharvestsamples) were recorded in mating disruption (MD), standard, and untreated orchards (1stgeneration only). No eggs were found in any plots in a mid-May sample and there was no1st generation CM damage; however, OBLR damage averaged 1% in the MD plots.Preharvest CMdamage was zero in downwindMD plots but averaged 1.8% in upwind plots.Bin counts were 0 in downwind and averaged 1.0%in upwind plots. OBLR damageaveraged 11% in all MD plots but only 1,0% in the MD+ OP-treatedareas, reflectingthelack of earlyOBLR pheromone to control the 1st generation and confirming the relativeefficacy of chemical control (Tables 1 and 2).113Table 1: CODLING MOTH DAMAGE - PUFFER TRIALBartlett pears, Lake County, 1996total of 2 picksSample MD MD+OPavg. 2 plots avg. 2 plotsupwind downwind upwind downwindGROWER UNTREATED1st Gen. -tree 0.0 0.0 0.0 10.52nd Gen. - tree 1.8 0.0 0.0 —2nd & 3rd Gen. - bin 1.0 0.0 0.0 0.0 0.0 —post-harvest 13.8 0.0 1.1 0.0 0.0 —Table 2: OBLR DAMAGE - PUFFER TRIALBartlett pears, Lake County, 1996total of 2 picksSample MDavg. 2 plotsupwind downwindMD+OPavg. 2 plotsupwind downwindGROWER UNTREATED1st Gen-tree 1.3 0.81st Gen.-bin 0.4 0.1 0.3 0.10.00.00.352nd Gen. - tree 5.0 6.32nd Gen.-bin 11.8 10.8 1.5 0.60.00.0 ~postharvest 0.0 0.0 0.0 0.0 0.0 —114

Mating disruption of codling moth using "puffers"

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Mating disruption of codling moth using "puffers"

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