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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #215839
Title: Peanut response to naturally-derived herbicides used in organic crop production

Author
item Johnson, Wiley - Carroll
item MULLINIX, JR, BENJAMIN - UNIV OF GA, TIFTON,GA
item BOUDREAU, MARK - HEBERT GREEN AGROECOLOGY

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/20/2008
Publication Date: 5/7/2008
Citation: Johnson, III, W.C., Mullinix, Jr., B.G., Boudreau, M.A. 2008. Peanut response to naturally-derived herbicides used in organic crop production. Peanut Science. 35:73-75.

Interpretive Summary: Weed management in organic peanut production is an integration of cultural, mechanical and chemical control tactics. Herbicides approved for use in organic crop production are derived from naturally occurring essential oils or organic acids, and tend to be non-selective. Despite their availability for use in organic cropping systems, there is no information on the tolerance of peanut to direct applications of these herbicides. Therefore, weed-free irrigated trials were conducted in 2004 and 2005 to quantify phytotoxic effects of herbicides with the potential to be used in organic peanut production. Clove oil and citric plus acetic acid were each applied at vegetative emergence of peanut (VE), two weeks after VE (2 wk), four weeks after VE (4 wk), sequentially VE/2 wk, sequentially VE/4 wk, sequentially VE/2 wk/4 wk, and a nontreated control. Clove oil was more injurious than citric plus acetic acid, with significant injury occurring with clove oil applied at 4-wk or sequentially. Citric plus acetic acid caused minimal peanut injury. There were no consistent effects of clove oil on peanut yield, although sequential applications of clove oil tended to reduce peanut yield. Peanut yield was not affected by citric plus acetic acid.

Technical Abstract: Weed-free irrigated trials were conducted in 2004 and 2005 to quantify phytotoxic effects of herbicides with the potential to be used in organic peanut production. Clove oil and citric plus acetic acid were each applied at vegetative emergence of peanut (VE), two weeks after VE (2 wk), four weeks after VE (4 wk), sequentially VE/2 wk, sequentially VE/4 wk, sequentially VE/2 wk/4 wk, and a nontreated control. Clove oil was more injurious than citric plus acetic acid, with significant injury occurring with clove oil applied at 4-wk or sequentially. Citric plus acetic acid caused minimal peanut injury. There were no consistent effects of clove oil on peanut yield, although sequential applications of clove oil tended to reduce peanut yield. Peanut yield was not affected by citric plus acetic acid.