One of the most important decisions that cotton producers make is which variety or varieties should they plant. There are conventional and transgenic or genetically engineered varieties that are available for weed and insect control.

Producers need to research varieties and to gain as much information as possible before making a decision. University variety trails are replicated and provide unbiased information. Results from strip tests, personal observation and discussion with other producers plus seed company literature are also useful for making an informed decision.

Although yield is the most important consideration, it is better to see how a variety has preformed over time. If a variety is newly released, it is important to know how the variety performed over multiple locations. Yield stability is also important because it will provide more consistency over time.

When planting a new variety for the first time, plant only a small acreage. It is better to learn how the variety will behave under your particular management style before expanding the acreage of the variety.

Other considerations include the plant height, maturity, plant hairiness, and fiber quality. Seed size and seedling vigor may be important in getting a stand. Seeding rates should be based on plant population rather than weight. While standard germination tests are useful, a cold temperature germination test is more indicative of the performance under adverse conditions.

Varieties that are resistant to herbicides such as Roundup can be part of a well-designed weed control program. However, the resistance already found in the marestail and the potential for resistance for other species should be taken into consideration. Caution is urged when planting non-Roundup or other herbicide resistant cotton to make sure that fields are labeled to prevent spraying mistakes. Drift of herbicides to non-resistant crops is increasing and precautions are necessary to prevent injury.

It is recommended that producers grow several different varieties differing in maturity to manage risk such as adverse weather and transient pest populations.

2006 Field Day Report