Thumbnail Image

Thesis

Browse

20161
Reset filters
Subject: Plant Pathology × Author: Bathula Jagadeesh × End date: 2016 × Start date: 2016 × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    Studies on Black Rot of Cabbage Caused by Xanthomonas campestris pv. campestris (Pammel) Dowson
    (University of Agricultural Sciences, Dharwad, 2016-06) Bathula Jagadeesh; Yadahalli, K.B.
    The major constraint for the cultivation of cabbage which is one of the most popular vegetables grown in Karnataka is the black rot disease. The black rot incidence and severity was noticed in all the surveyed locations of Haveri, Dharwad and Belagavi districts and incidence ranged from 40.78 to 67.50 per cent. The mean maximum per cent disease incidence (53.07) was observed in Haveri district, followed by Belagavi district (50.71). Whereas, the least per cent disease incidence (49.31) was observed in Dharwad district. Black rot severity was noticed in all the locations surveyed with a range 13.56 to 29.03 per cent. The mean maximum per cent disease index (24.00) was observed in Belagavi district, followed by Haveri district (23.53). Whereas the least per cent disease index (18.78) was observed in Dharwad district. The bacterium was identified through morphological, biochemical characteristics and pathogenicity tests. With regard to morphological variations, the isolates varied in their morphology on different solid media used for screening. Biochemical tests such as Gelatin liquification, KOH solubility and utilization of glucose, fructose for acid production were used. Among six different pathogenicity tests carborundum abrasion method proved best and these revealed that the bacterium is related to Xanthomonas campestris pv. campestris. The lowest mean per cent disease index was observed in seed treatment with K-cycline (0.5g) + Copper oxychloride (3.0g), seedling dip with Pseudomonas fluorescens (10g), first foliar spray with K-cycline (0.5g) + Copper oxychloride (3.0g) and second foliar spray with Pseudomonas fluorescens (10g) (24.93) and high (48.50) disease control over check with the mean yield of 309.25 q/ha.