Screening of cotton germplasm for their reaction against leafhopper, Amrasca biguttula biguttula Ishida (Homoptera: Cicadellidae)

Abstract

Preliminary screening of twenty-nine cotton genotypes (Gossypium hirsutum) against the leafhopper Amrasca biguttula biguttula Ishida undertaken, during August 2019 to February 2020, revealed fifteen genotypes viz., TCH 357, TCH 1809, TCH 1828, TCH 1895, TCH 1897, TCH 1941, TSH 383, TVH 002, TVH 003, TKH 0762, TKH 1225, SVPR 6, CO 15, KC3 and Suraj, as moderately resistant. Selected preliminary screening entries subjected to advanced screening revealed TCH 357, TCH 1809, TCH 1895, TCH 1897, TCH 1941, TCH 1828, TSH 383, TVH 002, TVH 003, TKH 0762, SVPR 6 and CO 15 as moderately resistant with population range of 2.75 to 4.42 numbers per three leaves and KC3 resistant. In the artificial screening, the resistant cultivar KC3 had least leafhoppers (2.67 per plant) and it had 56 trichomes per 300 mm2, which was higher than resistant check NDLH 1938. The resistant genotype KC3 had the maximum phenol (4.3 mg g-1), amino acid (136 mg g-1) and tannin (167 mg g-1), while the susceptible genotype DCH 32 had the lowest amount of total phenol (1.2 mg g-1), amino acids (18 mg g-1) and tannin (40 mg g-1).