(A55) APPLE: Malus domestica Borkhausen, 'Red Delicious' John C. Wise and Larry J. Gut Department of Entomology Michigan State University East Lansing, MI 48824-1115 Phone: (517) 432-2668 Fax: (517) 353-5598 E-mail: firstname.lastname@example.org E-mail: email@example.com Codling moth (CM): Cydia pomonella (L.) (internal feeder) Oriental fruit moth (OFM): Grapholita molesta (Busck) (internal feeder) Obliquebanded leafroller (OBLR): Choristoneura rosaceana (Harris) Three rates of Intrepid were applied to 14-yr-old 'Red Delicious' apple trees at the Trevor Nichols Research Complex in Fennville, MI (Green Block), with an FMC 1029 airblast sprayer calibrated to deliver 100 gpa at 2.5 mph. Two-tree plots were arranged in a completely randomized design with four replications. Tree spacing was 10 by 21 ft, with a minimum of one buffer tree and one buffer row separating all plots. Maintenance applications including Flint, Vangard, Nova, Penncozeb, and an early season miticide were applied separately to all treatments. Timing of applications was based on standard cover sprays or CM DD accumulations. Applications of test materials were made on 25 May (CM biofix+150DD ), 8 Jun (1C), 26 Jun (3C), 10 Jul (4C), 26 Jul (5C), 14 Aug (6C), and 28 Aug (7C) as indicated in the tables. Fruit evaluations were made on 18 Jun and 20 Sep by randomly picking 50 apples per replicate and examining them externally and internally for damage from broad-spectrum insect pests. Data were analyzed using ANOVA and means separation by LSD at P = 0 .05. All three treatments of Intrepid provided significant control of internal fruit feeder (CM/OFM) tunnels as compared with the untreated check. Although not statistically significant, some level of rate response was evident at these 18 Jul and 20 Sep fruit evaluations. None of these treatments reduced the level of CM/OFM surface entries (stings), and there was no clear rate response in this regard. The fact that there were no live larvae found in fruit at the 20 Sep rating suggests that there were higher levels of delayed-lethal effects with the higher Intrepid treatment rate. OBLR pressure was low, but all treatments provided significant control at the 20 Sep harvest rating.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2002