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Codling moth control in walnuts

Title: Codling moth control in walnuts.
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Name(s): Evers, Chad, author
Van Steenwyk, Robert A., author
Kiss, Attilla B., author
Type of Resource: text
Genre: Article
Issuance: monographic
Date Issued: 2010-01-01
Extent: 1 online resource
Language(s): English
eng
Summary: This trial was designed to evaluate the efficacy of new reduced risk insecticides for CM control as possible replacements for the grower standard organophosphate insecticides. The trial was conducted on mature 'Payne' walnut trees in a commercial orchard in Tracy, CA. Thirty treatments were replicated four times in a RCB design. Each replicate consisted of an individual tree. Treatments were applied with a hand-held orchard sprayer operating at 300 psi and delivering a finished spray volume of 400 gpa (5.7 gal/tree). Application timings were based on DD. DD were calculated with a 27 Mar biofix for the first CM generation and a 7 Jun biofix for the second CM generation using a single sine horizontal cutoff model with a lower threshold of 50°F and an upper threshold of 88°F. Maximum and minimum air temperatures were obtained from the Tracy A CIMIS #167 weather station at San Joaquin County, CA. Flight activity of male CM was monitored weekly from 26 Mar through 8 Sep with two Suterra 1X and two Trece Combo lures in Trece 1CP traps placed high in the canopy of four trees and was used to calculate biofix. Treatments were applied on 21 Apr (250 from 1st biofix), 28 Apr (313 from 1st biofix), 14 May (564 from 1st biofix), 19 May (687 from 1st biofix), 16 Jun (146 DD from 2nd biofix), 23 Jun (292 DD from 2nd biofix), 7 Jul (609 DD from 2nd biofix) and 8 Jul (630 DD from 2nd biofix). Control of the first CM generation (overwintering flight) was evaluated by inspecting all dropped nuts weekly from 29 May to 18 Jun for CM infestation. Control of the second and third generations (summer flights) was evaluated at harvest on 13 Sep by inspecting 100 nuts per tree (400 nuts per treatment) for CM and NOW infestation. Although treatments were not targeted for NOW, damage from NOW will often increase due to CM infestation since NOW larvae will infest nuts previously infested by CM. Data was analyzed using ANOVA and means were separated using Fisher's protected LSD, (P ≤ 0.05).
Identifier: fgcu_ir_000937 (IID)
Note(s): The publisher's version of the article is available at https://doi.org/10.4182/amt.2010.D23
Subject(s): walnuts
Codling moth
Navel orangeworm
Insecticides.
Links: https://doi.org/10.4182/amt.2010.D23
Persistent Link to This Record: http://purl.flvc.org/fgcu/fd/fgcu_ir_000937
Use and Reproduction: Copyright held by publisher.
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FGCU
Has Part: Arthropod Management Tests.