Bentley, Walter J.

Buchner, R.

Grant, J.

Hasey, J.

Olson, W.

Pickel, Carolyn

Prichard, T.

Welter, Stephen

Undetermined

ScholarsArchive@OSU

Mating Disruption/SIRWALNUT PMA: DEVELOPING A CODLING MOTH MATING DISRUPTION PROGRAMC. Pickel,W. Bentley, S. Welter, T. Prichard, R.Buchner, W. Olson, J. Hasey, and J. GrantUCIPM, Sacramento Valley, 142-AGardenHwy, Yuba City, CAKeywords: Codling moth, Cydiapomonella, walnuts, matingdisruption, Isomate C+,Trichogrammaplatneri, lorsban and confirm.TheWalnut PestManagement Alliance (PMA) was established with the funding provided by CaliforniaDepartment of Pesticide Regulation (CDPR) in 1998 to develop a statewide broad-based demonstrationand implementation project designed to encourage adoption of reduced-risk pestmanagement programsin commercial walnuts. The PMA is a cooperative group effort that includes the University ofCalifomia research and extension, walnut growers and industry, Biologically Integrated OrchardSystems (BIOS), and pest control advisors. In the second year of the Walnut PMA, the programcontinues to promote reduced-risk products and to improve communication and cooperation among thegroups involved. The primary pest of walnuts is the codlingmoth, Cydia pomonella and is the focuspest of the Walnut PMA. These efforts attempt to control the economic damage of this pest byimplementing reduced risk practices. The Walnut PMA research project included six early cultivarwalnut orchards ranging from Fresno county to Tehama county. Treatment areas were approximatelyfive acres with the exception of the untreated control that was one acre. The treatments consisted ofIsomate C+, Isomate C+ and Trichogramma planteri, Isomate C+ and chlorpyrifos or Confirm, thegrower standard, and the untreated control. The Isomate C+ was applied, at a single application, at arate of 400 per acre shortly after biofix. T planteri was aerially applied once per week for four weeksduring the second generation and once per week for four weeks during third generation at a rate of200,000 per acre. The grower standard consisted of the growers normal farming practices whichnormally includes organophophate and pyrethroid use. Orchards were monitored intensively usingTrece® Delta traps, nut drop counts, canopy counts aftereachgeneration, andharvest samples. Harvestevaluations depict that the combination of Isomate C+andLorsban treatment had thebest codling mothcontrol. The second best codling moth control was the grower standard, followed by the Isomate C+alone, and finally the Isomate C+ and T. planteri treatment. These results have confirmed that matingdisruptioncan be used successfully in walnut orchards. Growershave not readily adoptedthese reduced-risk alternatives because these practices are perceived as high risk and more expensive than usingconventional broad-spectrum insecticides. Reduced-risk programs require multiple years ofimplementation in order to gain the confidence of commercial walnut growers. The performance ofreduced risk techniques requires a commitment and teamwork so that the long-term effects areaccurately studied. Failure to adequately research reduced risk product may lead to the devastatingeconomical effects of increased pest pressures.151

Walnut PMA : Developing a codling moth mating disruption program

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Walnut PMA : Developing a codling moth mating disruption program

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