VARIETAL REACTION OF LEAF BLIGHT OF WHEAT CAUSED BY Bipolaris sorokiniana

Abstract

Subsequently three experiments were conducted in the Seed Pathology Laboratory, net house and experimental field of Sher-e BangIa Agricultural University, Dhaka, Bangladesh during the period from October 2005 to April 2006 to study the varietal reaction of leaf b1ight of wheat caused by Bipolaris sorokiniana. The wheat seeds of varieties Sonalika, Kanchan, Barkat, Shatabdi, Aghrani, Pavon- 76, Akbar, Gourab, Sourav and Protiva were collected from Bangladesh Agricultural Research Institute (BARl), Gazipur. In laboratory experiment the maximum number of conidia/seed (320) was recoded for the variety Sonalika and minimum number of conidia/seed (100) was recorded in variety Shatabdi. Maximum lesion length (11.67 em) on inoculated root was recorded from the variety Sonalika. No lesion i.e. infection (0.00 em) was recorded in the varieties Shatabdi and Akbar. In blotter test maximum germination (92.00%) was recorded in the variety Shatabdi, Sourab and Agrani and minimum (72.00%) was recorded in the variety Sonalika. Maximum (37%) incidence of seed borne Bipolaris sorokiniana was recorded in the variety SonaIika and minimum (17%) in Shatabdi, At panicle initiation stage, flowering stage, milking stage and hard dough stage minimum disease severity was recorded in the variety Shatabdi and maximum in the variety SonaJika. The highest grain yield/pot (5.97 g) was recorded in the variety Gourab. In the field maximum disease severity in all the counting periods was recorded in the variety Sonalika and minimum in the variety Shatabdi. The highest number of healthy spikelets/ear (26.77), number of grains/ear (38.66), number of healthy grains/ear (37.41) and IOOO-seedweight (42.12 g) were recorded in the variety Shatabdi. The highest grain yield/plot (391.77 g) was recorded in the variety Shatabdi and the lowest yield/plot (183.08 g) was recorded in the variety Aghrani.