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CONTROL OF GARDEN WEBWORM LARVAE, 2001

CONTROL OF GARDEN WEBWORM LARVAE, 2001 (F3) ALFALFA: Megicago sativa L., 'Cimmaron' M. A. Karner and J. R. Goodson Southwest Research and Extension Center Oklahoma State University Route 1, Box 15 Altus, OK 73521 Phone: (580) 482-8880 Fax: (580) 482-0208 E-mail: karner@okstate.edu Garden webworm (GW): Achyra rantalis (Guenée) Seven chemical insecticide treatments were evaluated for efficacy in controlling GW larvae infesting the third crop of a fourth-year stand of 'Cimmaron' alfalfa. Pretreatment samples revealed an infestation of 12.67 GW larvae/5 stems. Insecticides were applied on 31 Aug using a pressurized bicycle sprayer calibrated to deliver 10 gpa at 18 psi through six, 80015VS flat fan nozzles traveling at 3 mph. Treatments were arranged in a RCB design using plots 10 by 50 ft in size, replicated three times. Efficacy was determined by pulling 5 stems/plot on 4 DAT and carefully inspecting individual stems for larvae. Weather conditions after treatment were ideal for insecticide activity with no rainfall and a mean daily high temperature of 89º F. Counts on 4 DAT revealed a drop in larval numbers in the untreated check. This reduction was due to larvae beginning to pupate. Warrior T provided significantly better GW control than Lannate, Steward, Tracer, Intrepid, and Confirm. Average GW control ranged from 64.88% (Confirm) to 100% (Warrior T). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF GARDEN WEBWORM LARVAE, 2001

Arthropod Management Tests , Volume 27 (1) – Jan 1, 2002

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/27.1.F3
Publisher site
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Abstract

(F3) ALFALFA: Megicago sativa L., 'Cimmaron' M. A. Karner and J. R. Goodson Southwest Research and Extension Center Oklahoma State University Route 1, Box 15 Altus, OK 73521 Phone: (580) 482-8880 Fax: (580) 482-0208 E-mail: karner@okstate.edu Garden webworm (GW): Achyra rantalis (Guenée) Seven chemical insecticide treatments were evaluated for efficacy in controlling GW larvae infesting the third crop of a fourth-year stand of 'Cimmaron' alfalfa. Pretreatment samples revealed an infestation of 12.67 GW larvae/5 stems. Insecticides were applied on 31 Aug using a pressurized bicycle sprayer calibrated to deliver 10 gpa at 18 psi through six, 80015VS flat fan nozzles traveling at 3 mph. Treatments were arranged in a RCB design using plots 10 by 50 ft in size, replicated three times. Efficacy was determined by pulling 5 stems/plot on 4 DAT and carefully inspecting individual stems for larvae. Weather conditions after treatment were ideal for insecticide activity with no rainfall and a mean daily high temperature of 89º F. Counts on 4 DAT revealed a drop in larval numbers in the untreated check. This reduction was due to larvae beginning to pupate. Warrior T provided significantly better GW control than Lannate, Steward, Tracer, Intrepid, and Confirm. Average GW control ranged from 64.88% (Confirm) to 100% (Warrior T).

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2002

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