Pyrithiobac sodium controls nightshade without long-term effect on cotton
Nightshades are some of the most difficult weeds to control in Upland Acala varieties of cotton. A herbicide in the newest class of acetolactase synthase inhibitors has been developed for use as a selective over-the-top broadleaf herbicide in cotton. Studies were conducted...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of California Agriculture and Natural Resources
1998-09-01
|
| Series: | California Agriculture |
| Online Access: | http://calag.ucanr.edu/archive/?article=ca.v052n05p34 |
| Summary: | Nightshades are some of the most difficult weeds to control in Upland Acala varieties
of cotton. A herbicide in the newest class of acetolactase synthase inhibitors has
been developed for use as a selective over-the-top broadleaf herbicide in cotton.
Studies were conducted in Upland Acala cotton varieties in 1991, 1992 and 1993 to
evaluate the efficacy of Staple (pyrithiobac sodium) in controlling nightshade. The
herbicide was applied as early postemergence, mid-postemergence and sequential applications
at rates of 0.25, 0.50, 0.75, 1.0, 2.0 and 3.0 oz of active ingredient per acre (ai/acre).
Acceptable nightshade control was achieved at all rates, when applied as a single
application or as sequential applications, except for the 0.25 and 0.50 oz ai/acre
applications. The best control was achieved when the herbicide was applied at rates
of 1.0 to 3.0 oz ai/acre over the top of cotton in the cotyledon to eight true-leaf
stage, with nightshade in the cotyledon to six-leaf stage. Cotton injury symptoms
were evident with all treatments at 7 days after application but were nonexistent
by 90 days after application. There was no evidence to indicate that pyrithiobac sodium
has any long-term effect on cotton growth and development or on cotton lint yield. |
|---|---|
| ISSN: | 0008-0845 2160-8091 |