Vol. 10, Issue 10 (2021)

Author(s):
Lackisha Navin A, Saminathan VR and Sheeba Joyce Roseleen S

Abstract:
The antibiosis and antixenosis in different ruling maize hybrids viz., Pioneer 3401, NMH 3095, C.P.818 and the TNAU maize hybrids CO 6, COH(M)8 to fall armyworm (Spodoptera frugiperda) were assayed by evaluating insect growth parameters like developmental period and weight of different stages, nutritional parameters like ECI, ECD, AD and trichome density. Developmental period for larva, pre pupa and pupa was shortest on the hybrid P3401 (13.86 ± 0.26, 1.24 ± 0.01 and 6.09 ± 0.19 days) and longest on CO 6 (17.5 ± 0.1, 1.79 ± 0.02 and 8.27 ± 0.03 days). The weight of the 3^rd, 4^th, 5^th and 6^th instar larva, pre pupa and pupa was maximum on P3401 (72.22 ± 1.08, 142.13 ± 3.38, 281.26 ± 5.86, 354.68 ± 4.45, 323.2 ± 6.37 and 286.3 ± 5.25 mg) and minimum on CO 6 (57.28 ± 1.13, 100.27 ± 1.38, 259.33 ± 6.25, 310.22 ± 4.75, 274.9 ± 5.79 and 232.6 ± 4.74 mg). The nutritional indices namely ECI, ECD and AD were maximum on P3401 (53.28 ± 1.23, 96.11 ± 1.63 and 55.43 ± 1.62) and minimum on CO 6 (49.03 ± 1.00, 92.24 ± 2.76 and 53.16 ± 0.97). The soluble protein and anthocyanin in leaves were maximum in COH(M) 8 (68 mg/g and 0.604 mg/100g) and minimum in P3401 (39 mg/g and 0.416 mg/100g), total phenol and chlorophyll were maximum in CO 6 (13.475 mg/g and 1.316 mg/g) and minimum in NMH 3095 (5.415 mg/g and 0.675 mg/g).