Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 24:289-293 (1984)
© 1984 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Partial Growth Analysis of Soybeans Stressed by Simulated Green Cloverworm Defoliation and Velvetleaf Competition1

R. A. Higgins, L. P. Pedigo, D. W. Staniforth and I. C. Anderson2

Dry weight accumulation and allocation by soybean [Glycine max (L.) Merr. ‘Amsoy 71’] under selected combinations of competition with velvetleaf [Abutilon theophrasti (Medic.)] and simulated defoliation by the green cloverworm [GCW, Plathypena scabra (F.)] were evaluated with traditional growth analysis techniques in a 2-year field study. Discernible effects of weed-stress were restricted to soybeans grown in weed-proximate locations for 42 days or more after emergence. In general, weed-proximate soybeans stressed season-long by velvetleaf exhibited smaller dry weights, mean crop growth rates (CGR), and mean relative growth rates (RGR) than those in plots where velvetleaf competition was terminated within 5.5 weeks of emergence. In. cremental defoliation, equivalent in phenology and intensity to 120 GCW larvae/m of row did not substantially influence reproductive dry weights or reproductive growth rates within 75 days of soybean emergence. However, leaf and stem components were sometimes reduced within this period. Velvetleaf competition and simulated GCW defoliation did not interact significantly in this study.

Key Words: Stress • Crop Growth Rate • Relative Growth Rate • Interference • Simulated insect damage

1 Journal Paper no. J-10787 of the Iowa Agric. Home Econ. Exp. Stn., Ames, Iowa. Projects no. 2362, 2580, 2390, and 2492. This material is based upon work supported in part by the USDA under Agreement no. 590I-0410-9-0208-0.

2 Formerly predoctoral research associate (presently assistant professor, Dep. of Entomology, Kansas State Univ., Manhattan, KS 66502); professor, Dep. of Entomology; professor, Dep. of Plant Path., Seed, and Weed Science; and professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication September 7, 1982.




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Copyright © 1984 by the Crop Science Society of America.