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Determining Lock Tenacity in Pima Cotton¹

These investigations were initiated to develop a technique for estimating storm resistance under field conditions in Pima cotton (Gossypium barbadense L.). A 500-g force gauge was used for field determination of lock tenacity. Lock tenacity was measured for fully open bolls. The pull of the lock was made parallel to the suture opening when the gauge was held horizontally. The most consistent readings were obtained from bolls located in the upper two-thirds of the open-boll zone. Storm resistance was overestimated if diseased locks or bolls not fully open were measured.

Field estimates of lock tenacity of several Upland cotton (G. hirsutum L.) cultivars were close to earlier laboratory estimates. Highly significant differences in lock tenacity among Pima cultivars and consistent ranking of cultivars over experiments showed that they differ genetically for lock tenacity. The force gauge effectively measures the trait in a breeding program.

Key Words: Gossypium barbadense L. • Gossypium hirsutum L. • Storm resistance • Genotype x environment interaction

² Research Agronomist, ARS-USDA; 10601 North Loop Road, El Paso, TX 79927.

Received for publication June 12, 1973.