Brunner, Jay F.

Gut, Larry J.

Undetermined

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m1. Thresholds/Monitoring/SamplingMONITORING CODLING MOTH IN PHEROMONE-TREATED ORCHARDS:COMPARISON OF HIGH LOAD LURESLarry J. Gut and Jay F. BrunnerWashington State UniversityTree Fruit Research and Extension CenterWenatchee,WA 98801Pheromone traps baited with a high load-rate red septum (10mg of codlemone) have beenadoptedas a tool for monitoring codlingmoth (CM) in matingdisruption (MD)orchards. Thistrapping systemcan be used to trackCMflight and to determine the need for supplementaltreatments of pheromone or conventional insecticideswhereMD is failing to control CM.However, the reliability of a 10mg lure-baited trap to indicate the potential for fruit injury inMD orchards is not as good as growers and crops consultants would like. Here we report onefforts to develop more effective high load CM lures.Two kinds of experimental high load lures were tested, a plastic membrane (Consep, Inc.) and aluretape (Hereon, Inc.). Bothwere engineered to release 5-10 u.g of codlemone per hour. Thisemission rate was targeted because previous studies indicated a high degree of attractancy of the10 mg red septa releasing these quantities of pheromone. We directly compared the attractancyof the two experimental lures and the commercially available red septum loaded with 10 mg ofcodlemone (Trece, Inc.). The experimental design was a randomized complete block (6-8blocks). The number of male moths captured in Pherocon 1CP traps baited with the differentlures was recorded every 2-3 days. To minimize position effects, traps were rotated each timethey were inspected. Lures were replaced after three complete rotations (27 days). To evaluatethe effect of aging on attractiveness of lures, a trap baited with a red septum replaced at the endof each rotation, every 9 days, was included as a control. Trap bottoms were replaced after acumulative catch of 30 moths, more often if dirty.The relative attractancy of the various high load lures during the first and second generationflights of CM are shown in Figures 1A and B. Data are presented as the average capture ofmoths in traps baited with different lures over the course of 9 days. Each successive 9-daytrapping period corresponded to a complete cycle of trap rotations. The experimental high loadbiolure engineered by Consep was the most effective lure. It was as attractive as the commercialstandard, a 10 mg red septum, and maintained its attractancy for a longer period of time. Thebiolure remained as attractive as a red septum replaced at regular intervals throughout the first 27days of the first and second generation flights. In contrast, a significant reduction in the relativeattractancy of the unreplaced red septum was observed between the second and third trappingperiods in the first flight and the first and second trapping periods in the second flight. Theexperimental high load lure engineered by Hereon was the least attractive lure, capturing about athird as many moths as the red septum replaced at regular intervals and the biolure during bothflights.8.0 q7.0 :v>z* •*v •6.0 ;•a. 5.0 -Ck.10 •Jl. ••+* •\f\ 4.o :jC ,•**© ,fc 3.0 -Oro»<00/ 2.0 ->< •1.0 ;0.0 :B.Red septa (RS)Biolure0 RS aged• Hereon18 27Days after trap placementRed septa (RS)BiolureQRSaged• Hereon18 27Days after trap placement3636Figure 1. First generation (A) and second generation (B) captureof CM males in pheromone traps baited withvarious types of high load lures. A 10mg red septum replaced every 9 days is included as a standard; allother lures were replaced on day 27. Means followed by different letters are significantly different(P<0.05) according to Fisher's Protected LSD.

Monitoring codling moth in pheromone-treated orchards : comparison of high load lures

https://ir.library.oregonstate.edu/downloads/cv43p3884

Monitoring codling moth in pheromone-treated orchards : comparison of high load lures

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