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CONTROL OF EUROPEAN RED MITES AND APPLE RUST MITES, 2002

CONTROL OF EUROPEAN RED MITES AND APPLE RUST MITES, 2002 (A19) APPLE: Malus domestica Borkhausen, 'Red Delicious' John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 Tel: (517) 432-2668 Fax: (517) 353-5598 wisejohn@pilot.msu.edu Kevin Schoenborn schoenb6@msu.edu Larry J. Gut gut@pilot.msu.edu European red mite (ERM): Panonychus ulmi (Koch) Apple rust mite (ARM): Aculus schlechtendali (Nalepa) Predatory mite (ZM): Zetzellia mali (Ewing) Predatory mite (AF): Amblyseius fallacis (Garman) Miticides were applied to 15-yr-old 'Delicious' apple trees at the Trevor Nichols Research Complex in Fennville, MI (Brown Block) with an FMC 1029 airblast sprayer calibrated to deliver 100 gpa at 2.5 mph. Two-tree plots were arranged in a RCB design and replicated four times. Tree spacing was 18 x 20 ft, with one buffer tree and one buffer row separating all plots. Regular maintenance applications of Sovran, COCS, Dithane, Polyram, Ambush, Vangard, Ziram, and Guthion were made separately to all treatments. Initial treatment applications were targeted for either petal fall (24 May), or Panonychus ulmi action threshold (11 Jul, 2--3 motiles per leaf). Treatments 13 and 14 received an additional application 7 d after the threshold application. Mite evaluations were conducted on 9 Jul, 18 Jul, 31 Jul, 7 Aug, and 13 Aug by picking 50 randomly selected leaves from each replicate for a total of 200 leaves per treatment. Mites and eggs were removed with a mite-brushing machine and counted under a stereo-microscope. The number of ERM eggs and motiles were recorded, as well as Aculus schlechtendali motiles and predatory mites Zetzellia mali and Amblyseius fallacis. Mite data are reported as the mean number of mites per leaf, and were analyzed using ANOVA and means separation by LSD at P < 0.05. All PF treatments except the BioCover LS (1 gal rate) provided significant control of ERM motiles (Table 1) as compared to the untreated check at the 9 Jul rating. The BioCover LS (4 gal rate), BioCover UL, and V1283 began losing control by the 31 Jul rating. Envidor and Agri-Mek began losing control in August and were not different than the untreated check at the 7 Aug rating (Table 1.). Damoil and BioCover LS appear to be equally effective as penetrants for Agri-Mek. No treatment reduced ARM populations below the check at the 31 Jul or 13 Aug ratings (Table 3). For the threshold applications, Pyramite, FujiMite, Envidor, and Mesa all significantly reduced ERM motile forms within 2 wk after the threshold spray (Table 5); FujiMite and Mesa appeared to have particularly fast activity. The two GWN-1549 treatments showed very little activity on ERM motile forms. Mesa showed the greatest activity on ARM (Table 7), followed by GWN-1549 (12 oz rate), Envidor, and FujiMite at the 31 Jul rating. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF EUROPEAN RED MITES AND APPLE RUST MITES, 2002

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Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/28.1.A19
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Abstract

(A19) APPLE: Malus domestica Borkhausen, 'Red Delicious' John C. Wise Department of Entomology Michigan State University East Lansing, MI 48824-1115 Tel: (517) 432-2668 Fax: (517) 353-5598 wisejohn@pilot.msu.edu Kevin Schoenborn schoenb6@msu.edu Larry J. Gut gut@pilot.msu.edu European red mite (ERM): Panonychus ulmi (Koch) Apple rust mite (ARM): Aculus schlechtendali (Nalepa) Predatory mite (ZM): Zetzellia mali (Ewing) Predatory mite (AF): Amblyseius fallacis (Garman) Miticides were applied to 15-yr-old 'Delicious' apple trees at the Trevor Nichols Research Complex in Fennville, MI (Brown Block) with an FMC 1029 airblast sprayer calibrated to deliver 100 gpa at 2.5 mph. Two-tree plots were arranged in a RCB design and replicated four times. Tree spacing was 18 x 20 ft, with one buffer tree and one buffer row separating all plots. Regular maintenance applications of Sovran, COCS, Dithane, Polyram, Ambush, Vangard, Ziram, and Guthion were made separately to all treatments. Initial treatment applications were targeted for either petal fall (24 May), or Panonychus ulmi action threshold (11 Jul, 2--3 motiles per leaf). Treatments 13 and 14 received an additional application 7 d after the threshold application. Mite evaluations were conducted on 9 Jul, 18 Jul, 31 Jul, 7 Aug, and 13 Aug by picking 50 randomly selected leaves from each replicate for a total of 200 leaves per treatment. Mites and eggs were removed with a mite-brushing machine and counted under a stereo-microscope. The number of ERM eggs and motiles were recorded, as well as Aculus schlechtendali motiles and predatory mites Zetzellia mali and Amblyseius fallacis. Mite data are reported as the mean number of mites per leaf, and were analyzed using ANOVA and means separation by LSD at P < 0.05. All PF treatments except the BioCover LS (1 gal rate) provided significant control of ERM motiles (Table 1) as compared to the untreated check at the 9 Jul rating. The BioCover LS (4 gal rate), BioCover UL, and V1283 began losing control by the 31 Jul rating. Envidor and Agri-Mek began losing control in August and were not different than the untreated check at the 7 Aug rating (Table 1.). Damoil and BioCover LS appear to be equally effective as penetrants for Agri-Mek. No treatment reduced ARM populations below the check at the 31 Jul or 13 Aug ratings (Table 3). For the threshold applications, Pyramite, FujiMite, Envidor, and Mesa all significantly reduced ERM motile forms within 2 wk after the threshold spray (Table 5); FujiMite and Mesa appeared to have particularly fast activity. The two GWN-1549 treatments showed very little activity on ERM motile forms. Mesa showed the greatest activity on ARM (Table 7), followed by GWN-1549 (12 oz rate), Envidor, and FujiMite at the 31 Jul rating.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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