Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:465-466 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Modification of Flowering in Pima Cotton with Ethephon1

Leonard L. H. Pinkas2

In greenhouse experiments 2-chloroethylphosphonic acid (ethephon) was applied to American Pima cotton (Gossypium barbadense L.) plants, cultivar ‘Pima S-4,’ to determine if the first-formed (lowest) floral buds could be easily removed. At altitudes above 762 m (2,500 feet) this cultivar may set fruit too low on the plant for efficient mechanical harvesting when it is grown on soils of less than average productivity. Spray applications of 0.032M Ethephon raised the node level of the first flower about four nodes. The timing of the application did not appear to be unreasonably critical.

Key Words: 2-chlorochtylphosphonic acid • Gossypium spp.

1 Cooperative investigations of Plant Science Research Division, ARS, USDA, and the University of Arizona Agricultural Experiment Station. Arizona Agricultural Experiment Station Journal Paper No. 1871. The capable technical assistance of Mr. Donald Brummett is acknowledged. This is a report on the current status of research involving use of certain chemicals that require registration under the Federal Insecticide, Fungicide, and Rodenticide Act. It does not contain recommendations for the use of such chemicals, nor does it imply that the uses discussed have been registered. All uses of these chemicals must be registered by the appropriate state and federal agencies before they can be recommended

2 a Plant Physiologist, ARS, USDA, Western Cotton Research Laboratory, 4135 E. Broadway, Phoenix, Ariz. 85040.

Received for publication December 27, 1971.




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