EFFECT OF BORON ON SUSCEPTIBILITY OF CAULIFLOWER TO BLACK ROT
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Authors
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S. KUMAR AND S. C. KOTUR
Central Horticultural Experiment Station, Ranchi 834 002
Keywords:
Boron deficiency and toxicity, Xanthomonas campestris pv. campestris, Disease management, Ca/B ratio, CauliflowerAbstract
Field trials conducted in low boron containing alfisols (hot water soluble soil boron level 0.1 mg ks') on the effect of exogenous supply of boron (0 to 6.4 mg kg-I) indicated that this micro-nutrient has a definite role on the susceptibility of cauliflower to black rot caused by Xanthomonas campestris pv. campestris. Susceptibility was greater in boron deficient (below 0.4 .mg ks") and boron excess (above 1.6 mg kg-I) plants than in plants grown with optimum level of boron (0.4 to 1.6 mg kg-I). The disease index on foliage at harvest ranged from 45 to 32, and curd damage varied between 62 and 23 per cent both in the sub- and supra-optimum levels. In the optimum level, these were around 31 and 11 to 13 per cent, respectively. A strong correlation between boron uptake in leaf tissues, residual boron in soil and calciumlboron ratio in leaf tissues and disease incidence showed that boron imbalance enhances the host susceptibility.
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