Ketahanan Penyakit Bercak Coklat (Helminthosporium sp.) pada Padi Beras Merah, Padi Beras Hitam, Lokal Siam, dan Unggul Ciherang

Abstract

Helminthosporium sp. is the cause of brown spot disease in rice. This fungus has a wide host and is easily spread. This disease causes a loss of production reaching 50-91%. The use of resistant varieties is an appropriate solution for controlling this disease. This research aims to test the resistance level of red rice, black rice, local Siamese and superior Ciherang to brown spot disease, identify the length of incubation period and the infection rate of the fungus Helminthosporium sp. until it gives rise to indications of symptoms in each of the rice tested. The types of rice tested were brown rice, black rice, local Siamese and superior Ciherang with 6 replications, in order to obtain 24 experimental units. The results of the research show that all types of tested rice have the same level of resistance, namely susceptible types. The seriousness of the disease in black rice was 41, 11%, brown rice 34, 07%, local Siamese 34, 07% and superior Ciherang 36, 56%. The fastest incubation period occurred in local Siamese, accompanied by brown rice and black rice, on day 2 of inoculation, and the slowest incubation period for superior Ciherang rice was on day 4 after inoculation. Each test rice variety has a different rate of disease growth rate. In this study, the fastest average disease growth rate was red rice 0.344 units/day, black rice 0.186 units/day, local Siam 0.115 units/day and Ciherang 0.141 units/day.