Welcome to the University of Georgia Weed Science Homepage.

The weed science faculty and staff are committed to providing the information and resources you need to answer your weed control questions.

University of Georgia 2008 Herbicide Programs for Tropical Spiderwort Control in Cotton

Tropical spiderwort is a noxious, exotic, invasive weed that has spread quickly and has become a serious pest in many Georgia agricultural production areas. The increase in prevalence of tropical spiderwort in Georgia may be attributed in part to
1) adoption of weed management programs that lack residual herbicides and
2) adoption of reduced-tillage production systems.

Suggestions for the management of different levels of tropical spiderwort infestations in Georgia cotton are available at this link.

University of Georgia Herbicide Programs for Controlling
Glyphosate-Resistant Palmer Amaranth in 2008 Cotton

Glyphosate-resistant Palmer amaranth (pigweed) is Georgia’s most problematic weed in cotton and currently infests at least 13 counties. Two Palmer amaranth per 20 row feet of cotton can reduce yield at least 23%, and a single female plant in Macon County produced 450,000 seeds when competing with cotton for the entire season. Spread of this resistant pest is rapid through traditional means such as custom harvesting, lack of cleaning equipment, and spreading of infested material such as gin trash, but the resistant trait is likely moving most rapidly via pollen.

Read about herbicide management programs for glyphosate resistant Palmer amaranth, and programs used to delay the onset of resistance by clicking this link.

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Disclaimer

This website may contain research results of use patterns of herbicides, some of which may not be currently registered for the particular use. Such results are included for informational purposes only and should not be taken as recommendations for use. Additionally, the University of Georgia does not guarantee nor warrant the standards of the products, nor do they imply approval of the products to the exclusion of others which may be similarly effective. Official University of Georgia weed control recommendations can be found in the latest edition of the Georgia Pest Control Handbook (Special Bulletin #28).