Adams, Todd B.

Landolt, Peter J.

Zack, Richard S.

Undetermined

ScholarsArchive@OSU

Developing A Species Specific Monitoring SystemFor Com Earworm{Helicoverpazed)T. B. Adams, P. J. Landolt1, R. S. ZackDepartment ofEntomology, Wasliragton State University, Pullman, WA, USA 99164teDA-ARS, Yakima Agricultural Research Laboratory5230Konnowac Pass RcL, Wapato, WA, USA 98951With the pheromone monitoring system currently in use, growers are often unableto accurately sort true com earworm {Helicoverpa zed) from other moths including falsecomearworm {Heliothis phloxiphaga). When these other moths are captured incomearwormmonitoring traps, confusion inidentifications may sometimes lead tounnecessary pesticide sprays targeted for com earworm. The goal of this research istodevelop amore specific monitoring system for comearworm.Intrying todevelop such asystem, several objectives were established. First, wewanted to find apheromone blend that reduces the capture of false comearworm. Intrying to find the best ratio of chemicals we started with afour component Klun blendand modified two ofthe four components; Z-7-16:Ald and Z16:Ald were manipulated inarange of from 0-30%. Each component was changed individually and tested. Then,both components were changed together inequal ratios of from 0-30%. A secondobjective was to find the best rubber seplum that would optimize the stability and releaseofthecomearworm pheromone. Five different septa were tested: West Red, West Gray,Aldrich, Israeli, and Thomas. A third objective was to find thebestpheromone dose thatwould optimize the capture ofcomearworm while minimizing thecapture of felse comearworm. A forth objective was to find 1he best trap design for comearwormwhileexcluding felse comearworm. Traps tested were theUniversal moth bucket trap, theclothmesh trap, theMuMpher trap, the i^grisense dome trap, and theNadel trap. Acomparison ofthe traditional monitoring systemwith our newly developed monitoringsystemwas conducted. For the traditional monitoring system the clothmesh trap and acommercial com earwormlurewere usetl,while forourmonitoring systemtheUniversalmoth bucket trap and our pheromone blend, dose, and aWestRedseptumwere used. Asecond part ofthis project was to define the seasonal phonologies ofcomearworm andfelse com earworm.All tests consisted of5 treatments replicated5 times in a 5X5 experimentaldesign. The universal mothbucket trap withavapona pesticide strip inthetrap was usedin alltests. At eachtest site, trapswere placed 33metersapart in a north-southorientation, traps were placed ataheight of0.5-1.0 meter. Traps werechecked twiceaweek and moths were counted and recorded. Pheromones were changed once a monthand the vapona strips were changed every two weeks. Alltestswere conducted nearMattawa, WA, outside ofcorn fields. A system comparison test was conductedwith 2treatments replicated 10 times.A com earworm pheromone blend thatcontains 30% Z-7-16:Ald reduced thenumber of felse com earworm trapped by 80%(Figure 1). The best rubber septum forstability and release ofthe com earworm pheromone wasWest red(Figure 2). Apheromone dose of 1.0 mgwas optimal For comearworm capture (Figure 3). The buckettrap isas efficient as thecloth meshtrap for the capture ofcomearworm (Figure 4). The79new trapping system captured fewer felse com earworm than the traditional trappingsystem (Figure 5). Other advantages ofthe new trapping system include the feet that thebucket trap is cheaper and lasts longerman the clothmesh trap and moths trapped withthe new system are killed making them eesier toidentify thus helping tomake soundmanagement decisions. Seasonal phenology studies of 1999 (Figure 6) and 2000 (Figure7) show that felse com earworm appeared about two weeks before true com earworm.80« •Figure 1I 3 10% Z-7-lfcAM ia Klon Blendi;u 03O SEE*—ir10Jt1.es *0.011 J 10% Zr7-U:Ald ia Klua BlendFigure 30.3 1.0 3.0PhenHaoae Dose ia mg30I0J»m0.03 ~ 0.1 OJPheromone Dose in m»1.081Figure 2• • • •West Red West Gray Aldrich Israeli ThomasRubber Fomotetioa10B•H •Id ,u.0 ^ ^West Red West Gray Aldrich Israeli ThornsRubber FormulationFigure 425jtt 20•a^ 15efMtu s s atauBacket Cloth Mesh Multiplier Agrisease NadelTrap Design1 0.1uI"I" feBacket Cloth Mesh Mvltipher AgrisenseTrap DesignNadel100I sou•a. 60et 40U 20Figure 6.•.•.i.i.i.m.-.»,i,V> J> > ^ * ^« a/* V* a/*Datei ii.J* ^1,1,.,* ,-,i,»JJ, iiXX>* V> 9? # J*V V V V a? *VDale9 -/Figure 5Systect Comparison90je goJS 70(J 602- 50g 40I 30U 20<-> 100 ,-AFigure 7^ffijiiiiiimiinr^ ^ ^ * ^ ** ^ *> f * J> # J>j>16g 14A 10u) 40 i *-r* tiiTlTDateIZE JUL& & & J1 «C A* O" o> <?> «> ^> # C» ^Date82

Developing a species specific monitoring system for corn earworm (Helicoverpa zea)

https://ir.library.oregonstate.edu/downloads/ww72bh439

Developing a species specific monitoring system for corn earworm (Helicoverpa zea)

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