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Codling moth control in walnuts

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Date Issued:
2008-01-01
Summary:
This trial was designed to evaluate the efficacy of new reduced risk insecticides as possible replacements for the grower standard organophosphate insecticides. The trial was conducted on mature ‘Waterloo’ walnut trees in a commercial orchard near Fairfield, CA. Seventeen individual tree treatments were replicated four times in a RCB design. Treatments were applied with a hand-held orchard sprayer operating at 250 psi and delivering a finished spray volume of 250 gpa (3.33 gal/tree). Application timings were based on DD. DD were calculated using a 1 Apr biofix for moths from the overwintering generation and a 11 Jun biofix for moths from the first 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. Treatments were applied on 5 May 2008 (333 DD from the 1st bioflix), 26 Jun (365 DD from 2nd biofix) and 7 Jul (612 DD from 2nd biofix). When two applications were applied, the 7 Jul application was not applied. Control of CM was evaluated at harvest on 1 Oct by inspecting 125 nuts per tree (500 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. Control of motile TSSM and WPM were evaluated by leaf-brushing 10 terminal leaflets per replicate collected from each tree weekly from 3 Jul to 20 Aug. The plates with the contents from the brushed leaves were counted under magnification (20X) in the laboratory. Data was analyzed using ANOVA and means were separated using Fisher’s protected LSD, (P ≤ 0.05).
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: 2008-01-01
Extent: 1 online resource
Language(s): English
eng
Summary: This trial was designed to evaluate the efficacy of new reduced risk insecticides as possible replacements for the grower standard organophosphate insecticides. The trial was conducted on mature ‘Waterloo’ walnut trees in a commercial orchard near Fairfield, CA. Seventeen individual tree treatments were replicated four times in a RCB design. Treatments were applied with a hand-held orchard sprayer operating at 250 psi and delivering a finished spray volume of 250 gpa (3.33 gal/tree). Application timings were based on DD. DD were calculated using a 1 Apr biofix for moths from the overwintering generation and a 11 Jun biofix for moths from the first 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. Treatments were applied on 5 May 2008 (333 DD from the 1st bioflix), 26 Jun (365 DD from 2nd biofix) and 7 Jul (612 DD from 2nd biofix). When two applications were applied, the 7 Jul application was not applied. Control of CM was evaluated at harvest on 1 Oct by inspecting 125 nuts per tree (500 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. Control of motile TSSM and WPM were evaluated by leaf-brushing 10 terminal leaflets per replicate collected from each tree weekly from 3 Jul to 20 Aug. The plates with the contents from the brushed leaves were counted under magnification (20X) in the laboratory. Data was analyzed using ANOVA and means were separated using Fisher’s protected LSD, (P ≤ 0.05).
Identifier: fgcu_ir_000940 (IID)
Note(s): The publisher's version of the article is available at https://doi.org/10.4182/amt.2009.D19
Subject(s): walnuts
Codling moth
Insecticides.
Navel orangeworm
Links: https://doi.org/10.4182/amt.2009.D19
Persistent Link to This Record: http://purl.flvc.org/fgcu/fd/fgcu_ir_000940
Use and Reproduction: Copyright held by author(s).
Use and Reproduction: http://rightsstatements.org/vocab/InC/1.0/
Host Institution: FGCU
Has Part: Arthropod Management Tests.

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