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Dynamics of Subeconomic Threshold Populations of Sicklepod (Cassia obtusifolia) in a Peanut-Cotton-Corn Rotation

Published online by Cambridge University Press:  12 June 2017

W. Carroll Johnson III ,
John Cardina  and
Benjamin G. Mullinix Jr.
W. Carroll Johnson III
Affiliation:
For. Res. Agron., Agric. Res. Statistician, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
John Cardina
Affiliation:
For. Res. Agron., Agric. Res. Statistician, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
Benjamin G. Mullinix Jr.
Affiliation:
For. Res. Agron., Agric. Res. Statistician, Coastal Plain Exp. Stn., Tifton, GA 31793-0748
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Abstract

Studies were conducted from 1987 to 1990 to measure the dynamics of sicklepod established at subeconomic threshold populations in a peanut-cotton-corn cropping system. The experimental site had no native populations of sicklepod prior to initiation of the study. Main plots were crops in the rotation sequence plus continuous summer fallow (no crop). Subplots were: sicklepod established in the initial year of the study, sicklepod established every year of the study, and no sicklepod. Sicklepod was established at subeconomic threshold densities to simulate weed survival and seed production in fields where economic thresholds were the basis for weed management decisions. Sicklepod growing alone in fallow plots produced more seed per plant, resulting in significantly more seedlings throughout the study than sicklepod growing with crops. Sicklepod growing in corn produced the fewest seed per plant. Seed produced from subeconomic threshold densities established only in the first year caused 7-, 21-, and 20-fold increases in sicklepod populations during the next three seasons compared to the nontreated control.

Keywords

Sicklepod, Cassia obtusifolia L. # CASOBcorn, Zea mays L. ‘DeKalb DK-689’ and ‘Pioneer 3165’cotton, Gossypium hirsutum L. ‘Deltapine DPL-90’peanut, Arachis hypogaea L. ‘Florunner.’Seedbankweed population dynamicsweed seedlingsCASOB
Type
Weed Biology and Ecology
Information
Weed Science , Volume 42 , Issue 3 , September 1994 , pp. 364 - 368
Copyright
Copyright © 1994 by the Weed Science Society of America 

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