International Journal of Plant Protection

C. S. Choudhary ¹, Anjana Arun ¹, S. M. Prasad ²

Affiliations
1 Regional Research Station, Agwanpur, SAHARSA (BIHAR), IN
2 Department of Plant Pathology, Birsa Agricultural University, RANCHI (JHARKHAND), IN

Abstract

The crop sown on June 5, recorded lowest percentage Alternaria leaf spot disease intensity (PDI) of 19.25 and 26.00 per cent during Kharif, 2002-03 and 2003-04 crop seasons, respectively. A relatively higher PDI was recorded with the advancement of dates of sowing. The late sowing (August) crop favoured quick disease development and recorded highest (60.50 and 70.50 %) disease intensity. The mean temperature 21.94 to 29.14°C; mean relative humidity 74.35 to 90.63 per cent, mean rainfall of 7.81 to 12.33 mm and 38 to 40 rainy days during the seasons favoured disease development. Highest seed yield of 380.0 kg/ha and 364.0 kg/ha were recorded when crop was sown timely on 25^th June during both the years, respectively. Multiple regression equation between disease index and weather variables exhibited strong relationship among the different components of epiphytotics during both the years of study and indicated that the combined effect of different weather variables favoured the disease development causing upto 99 per cent variation in the disease index.

Keywords

Sesame, Dates of Sowing, Weather Parameters, Alternaria Leaf Spot Disease.

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Anjana Arun ¹, C. S. Choudhary ²

Affiliations
1 Department of Plant Pathology, Rajendra Agricultural University, Pusa, SAMASTIPUR (BIHAR), IN
2 Regional Research Station, Agwanpur, SAHARSA (BIHAR), IN

Abstract

Out of the seven fungicides tested in vitro against Fusarium oxysporum f. lini, carbendazim 50WP and benlate 50WP were found most effective in checking the colony growth to 00 mm (completely check) followed by thiram75WP (10.52 mm), captafol 80WP (14.21 mm) and captan 50WP (15.24 mm). In field trial studies, seedling emergence and mortality inhibition were maximum in case of the seeds treated with Trichoderma viride (92.35% and 5.63%) followed by carbendazim 50WP (84.60% and 6.96%). Maximum linseed yield (7.93q/ha) was obtained when seeds treated with Trichoderma viride (10⁷ spores/g).

Keywords

Linseed, Fuasarium oxysporium f. Lini, Management, Fungicides.

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