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Identification of Brown Spot Disease in Cultivated Rice Field of Uttar Pradesh

Saket Kumar, Rajeev Pratap Singh, Rajesh M. Singh

Abstract


Brown spots were observed throughout the growing season and may vary in size, shape
and color depending on the environmental conditions, age of the spots and the degree of
susceptibility of the rice variety. Disease development was favored by high relative humidity
(86-100%) and temperatures between 24-30°C. So, rice plants were cultivated using
standard agronomic practices becouse circular to oval spots emarginated during the maturity
in rice leaves. The spotted leaves in rice were associated with weak plants growing under
stressful conditions such as water stress, inadequate fertilization and herbicide toxicity.
The disease was measurement with, Area Under Brown Spot Progress Curve (AUBSPC).
Under laboratory conditions, six fungicides (propiconazole, hexaconazole, tricyclazole,
carbendazim, triadimefon and mancozeb) were tested. Out of different fungicides,
propiconazole was most effective with maximum inhibition of 96% at 250 ppm
concentration. Under field conditions, six rice varieties viz. Sarju-52,Medium-3022,MTU-
7029,HUBR-2-1,BPT, Malviya Basmati-105, were used for testing different fungicides at
0.1% concentration during Kharif Season-2015 and application of propiconazole
significantly reduced the disease severity and increased the grain yield of all the varieties
as compared to their respective controls. It was concluded that timely spray of propiconazole
reduce the disease severity and thereby increase the yield of the rice.

Keywords


Brown spot, Bipolaris oryzae, fungicides effect, pathogenecity and Rice

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DOI: http://dx.doi.org/10.21756/cab.v1i2.6897

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