EVALUATION OF SUNFLOWER, Helianthus annus L. GERMPLASM ACCESSIONS AGAINST LEAFHOPPER, Amrasca biguttula biguttula Ishida UNDER FIELD CONDITIONS
Field experiment was conducted during Rabi season 2016-17 and 2017-18 to screen 57 sunflower germplasm accessionsÂ along with commercial hybrid, Syngenta SB-275 and susceptible check, Morden to evaluate their reaction against sunflowerÂ leafhopper at ICAR-Indian Institute of Oilseeds Research (IIOR), Hyderabad, India. Based on mean scale index (MSI) theÂ accessions were categorised as highly resistant, resistant, moderately resistant, susceptible and highly susceptible. During RabiÂ 2016-17, average leafhopper infestation ranged between 0.3 and 18.2 per three leaves per plant across the germplasm accessions.Â TSG- 349 recorded the lowest mean population of leafhoppers (0.3 per three leaves per plant) while highest number of
leafhoppers were recorded on the susceptible check, Morden (18.2 per three leaves per plant), 22 accessions were foundÂ resistant, 25 were found moderately resistant and 10 were found susceptible. During Rabi, 2017-18, leafhopper infestation rangedÂ between 2.2 and 32.4 per three leaves per plant. GMU-339 recorded the lowest mean population of leafhoppers (2.2 per threeÂ leaves per plant). Whereas, highest numbers of leafhoppers were recorded on the susceptible check, Morden (32.4 per threeÂ leaves per plant), 15 germplasm lines were categorized as resistant, 30 germplasm lines were identified as moderately resistantÂ while to be 12 were susceptible. Considering both the years, consistently 15 accessions were identified as resistant and 23Â accessions moderately resistant.