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1 October 2010 Biological Control of Hemp sesbania (Sesbania exaltata) and Sicklepod (Senna obtusifolia) in Soybean with Anthracnose Pathogen Mixtures
C. Douglas Boyette, Robert E. Hoagland
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Abstract

In greenhouse and field experiments conducted over 3 yr, tank mixtures of spores of the fungi Colletotrichum truncatum and Colletotrichum gloeosporioides, formulated in unrefined corn oil and Silwet L-77 surfactant, were evaluated as a mycoherbicide mixture for simultaneous control of hemp sesbania and sicklepod, respectively. In greenhouse tests, 100% mortality and dry weight reduction of hemp sesbania occurred 6 d after treatment (DAT), whereas 15 d were required to achieve 100% mortality and dry weight reduction of sicklepod. In field experiments conducted in narrow-row (51-cm) soybean test plots, a single application of the fungal mixture formulated as described controlled hemp sesbania and sicklepod 94% and 88%, respectively, 28 DAT. Neither fungus, applied as aqueous conidial suspensions, provided control of their respective weed hosts. These results indicate that tank mixtures of these anthracnose-forming pathogens can effectively control hemp sesbania and sicklepod with a single application.

Nomenclature: Colletotrichum gloeosporioides (Penz.) Penz and Sacc.; Colletotrichum truncatum (Schw.) Andrews and Moore; hemp sesbania, Sesbania exaltata (Rydb.) ex A.W. Hill SEBEX; sicklepod, Senna obtusifolia (L.) Irwin and Barneby CASOB; soybean, Glycine max (L.) Merr.

C. Douglas Boyette and Robert E. Hoagland "Biological Control of Hemp sesbania (Sesbania exaltata) and Sicklepod (Senna obtusifolia) in Soybean with Anthracnose Pathogen Mixtures," Weed Technology 24(4), 551-556, (1 October 2010). https://doi.org/10.1614/WT-08-154.1
Received: 13 March 2010; Accepted: 19 July 2010; Published: 1 October 2010
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KEYWORDS
biocontrol
biocontrol agent
bioherbicide
narrow-row soybeans
pathogen mixtures
surfactant
unrefined corn oil
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