One nectariless cotton variety (NIAB-Karishma) and three varieties with leaf nectaries (CIM-443, NIAB-78 and S-12) were compared for bollworm damage. The F2 population of the cross between the nectariless variety (NIAB- Karishma) and variety with nectarines (CIM-443) along with the F1 and the parents was also screened to study the genetics of leaf nectaries. The F1 plants were with nectaries while in the F2 population the ratio of nectariless and nectarines plants was 15:1. The studies suggested that two genes were involved for the development of nectaries. The results of correlations for nectariless and agronomic traits showed that nectariless trait segregated independently so breeding for nectariless trait would not affect agronomic traits in cotton.
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