grasses. Although most producers apply arsenicals in a directed manner, some apply them over the top. In the latter case, there is the possibility of high residue levels occurring in cotton, especially if applications are made during the early reproductive stage of cotton growth and if there are multiple applications (Frans and Chandler
Banjaran: The Glyphosate-Tolerant Cotton
Environmentally desirable feature of the introduction of glyphosate-tolerant cotton include
It offers producers the option of replacing with glyphosate several herbicide combinations that include arsenical compounds.
Glyphosate is less likely to lead to the development of resistant weeds than many other herbicides (Benbrook 1991).
The introduction of glyphosate-tolerant cotton is compatible with IPM. Producers could apply the herbicide only if needed, thus reducing the use of preemergence herbicides.
The most damaging components of glyphosate are its inert components (Goldburg et al., 1990). Recently, the Environmental Protection Agency has given glyphosate an “E” carcinogenicity (noncarcinogen) rating.
Glyphosate does not have carryover problems.
The introduction of glyphosate-tolerant cotton could aid in the development of minimum-till practices that would result in reduced soil erosion.
Glyphosate-tolerant cotton could enable producers to apply herbicide on an as-needed basis, a key principle of all IPM systems. If a farmer planted a field with a herbicide-tolerant variety, the farmer could cut back the initial herbicide application or try to control weeds with mechanical cultivation. If chemical weed control became necessary, herbicide could be applied over the top to the entire field or by spot application in the areas of field where weeds were threatening.
SAMPLE PETITION—Herbicide-Tolerant Plants