Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 15:251-253 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Glandless Cotton: Susceptibility to Lygus hesperus Knight1

Ward M. Tingey, Thomas F. Leigh and Angus H. Hyer2

Field and laboratory methods were used to study population growth and feeding damage of Lygus hesperus Knight (a major cotton pest) on isogenic lines of glandless and glanded cotton, Gossypium spp. In no-choice field cages, a glandless genotype had 2.5 times more L. hesperus and 57% fewer bolls compared to its glanded equivalent. The larger lygus bug population on glandless cotton was attributed to a two-fold increase in growth rate and survival of nymphs. Thus glandless cotton may require more intensive control of L. hesperus than normal glanded cotton, to minimize losses in yield and quality.

Key Words: Gossypium hirsutum L. • G. barbadense L. • Insect susceptibility • Gossypol • Cottonseed • Antibiosis • Pest management • Lygus bugs

1 This research was supported by a grant from the Rockefeller Foundation, New York. The authors are indebted to Dr. E. L. Turcotte for providing glandless and glanded ‘Pima S-4’ cottonseed. Dr. V. Sevacherian and C. E. Jackson aided in statistical analysis of data.

2 Assistant professor, Dept, of Entomol., Cornell U. Ithaca. NY 14853; entomologist Dept. of Entomol., U. of Calif., Davis CA 95616; and research agronomist, ARS, USDA, 17053 Shatter Ave., Shatter. CA 93263, respectively.

Received for publication September 3, 1974.




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