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Influence of weeds on insecticide deposition and soybean looper (Pseudoplusia includens) management

Published online by Cambridge University Press:  12 June 2017

Charles F. Grymes ,
James L. Griffin ,
B. Rogers Leonard ,
David L. Jordan  and
David J. Boethel
Charles F. Grymes
Affiliation:
Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 302 Life Sciences Building, Baton Rouge, LA 70803. Current address: Zeneca Ag Products, 2808 East Allendale, Victoria, TX 77901
B. Rogers Leonard
Affiliation:
Macon Ridge Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 212 Macon Ridge Road, Winnsboro, LA 71295-5719
David L. Jordan
Affiliation:
Crop Science Department, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
David J. Boethel
Affiliation:
Department of Entomology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 402 Life Sciences Building, Baton Rouge, LA 70803
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Extract

Glycine max fields with Sesbania exaltata and Senna obtusifolia were selected to evaluate weed effects on insecticide spray droplet deposition within the crop canopy and soybean looper (Pseudoplusia includens) mortality. Weedy and weed-free treatments with and without thiodicarb insecticide application were included. Soybean looper populations in plots with S. exaltata and S. obtusiolia were approximately half those found in weed-free plots. Thiodicarb reduced soybean looper larval survival in the absence of weeds or when weeds were present in three of four experiments. Dye-sensitive cards placed in the top, middle, and bottom thirds of the G. max canopy showed droplet coverage to be highest on cards placed in the top of the canopy. Weeds reduced insecticide coverage in the top of the G. max canopy 26 to 43%. Thiodicarb deposition within the middle and bottom levels of the canopy was not reduced by weeds. Leaflets from the top, middle, and bottom thirds of the crop canopy were collected immediately after insecticide application to bioassay for insecticide deposition. For both years, mortality of soybean looper larvae on leaflets collected from the middle or top of weedy and weed-free G. max treated with thiodicarb was equivalent. Assuming that an economic return can be expected, soybean looper management may not need to be altered when moderate infestations of S. exaltata and S. obtusifolia are present in G. max in late season.

Keywords

Sesbania exaltata (Raf.) Rybd. ex A.W. Hill SEBEX, hemp sesbaniaSenna obtusifolia (L.) Irwin et Barneby CASOB, sicklepodsoybean looper, Pseudoplusia includens (Walker)Glycine max (L.) Merr. ‘Asgrow 6785’ and ‘DPL 3627’, soybeanthiodicarb.Pest managementpest complexesmultiple pestsweed-insect interactionsCASOBSEBEX
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 3 , June 1999 , pp. 321 - 326
Copyright
Copyright © 1999 by the Weed Science Society of America 

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