Controlling Purple Nutsedge (Cyperus rotundus) in Pima Cotton (Gossyium barbedense) with EPTC

J.P. Chernicky and S. Watkins


 
ABSTRACT

Field studies were conducted in 1990 and 1991 in Pinal county, AZ to measure the response of long staple cotton to post-directed, sequential applications of EPTC (2.0 and 3.0 lb/a) applied alone and in combination with MSMA (2.0 lb/a). All EPTC treatments resulted in an initial reduction in purple nutsedge populations. The degree and duration of nutsedge suppression resulting from the application of EPTC varied with year, EPTC rate and the presence or absence of MSMA. cotton injury ranged from 10 to 18% following sequential applications of EPTC at 3.0 lb/a. EPTC induced injury to cotton was expressed in the form of circular necrotic spots on the leaf surface, and browning of the leaf margins which in severe cases led to leaf shed. Sequential applications of EPTC can be used effectively to reduce the competitiveness of purple nutsedge with long staple cotton.



Reprinted from 1992 Proceedings Beltwide Cotton Conferences pp. 1301 - 1302
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998