Biophysical and Morphological Basis of Resistance against Linseed (Linum usitatissimum L.) Bud fly (Dasyneura lini Barnes)

Abstract

A field experiment was conducted at the research cum instructional farm, College of Agriculture, Nagpur, Dr. PDKV, Maharashtra during rabi 2021-22 with the objective to find the biophysical and morphological basis of resistance against linseed bud fly (Dasyneura lini Barnes). A set of 36 germplasm was sown in RBD in paired rows of 2 m and a spacing of 45 cm x 10 cm. The results indicated that resistant germplasm against bud fly IC498428 and Jawahar-17 had relatively higher sepal thickness (21.18 and 19.64 μ) as well as lower average infestation recorded (8.19 and 9.75%) while susceptible germplasm IC413173 (49.12%), IC498783 (42.70%), IC498924 (42.48%) and EC011748 (45.00%) exhibited minimum sepal thickness (6.90, 9.28, 9.32 and 8.33 μ, respectively). The character association studies showed a highly significant negative correlation (r = -0.852**) between the thickness of sepals and the percentage of bud fly infestation. The correlation between plant height and bud infestation was negative (-0.042) and non-significant