Effect of Various Manurial Application on the incidence of Brown Spot of Rice

摘要

Brown spot of rice incited by Drechslera oryzae (Breda de Hann) Subram and Jain is one of the serious diseases of rice and is known to occur in most rice growing areas of the world. In India, it occurs more or less every year in mild or severe form. Three types of infection caused by the pathogen results in yield loss. The first is due to poor germination of infected seed, the second is leaf infection resulting in the reduction of effective leaf surface and third is the attack on the grains leads toshrivelling and discolorations. Ghosh et al., (1960) recorded the yield loss up to 90 per cent in West Bengal during 1942. Keeping in view the economic importance and heavy losses inflicted by the disease, the present investigation aims to study the effect of different manurial applications on the incidence of brown spot disease on leaves and grains of two cultivars of rice.