Studies on the development of storage scab in apple and its management
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Authors
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J.N. SHARMA and J.L. KAUL1
Dr. Y.S. Parmar University of Horticulture and Forestry, Scab Monitoring and Research Laboratory, Kotkhai, Distt. Shimla (HP) 171 202
1 Department of Plant Pathology, Dr. Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan 173 230
Keywords:
Apple scab, storage scab, Venturia inaequalisAbstract
Fruits of Royal and Golden Delicious apple cultivars were harvested, wrapped and stored in ambient conditions at Kotkhai in Himachal Pradesh, India. Storage scab, caused by Venturia inaequalis, appeared after 45 days in both the cultivars. With Golden Delicious apples, disease incidence was 10 and 20% after 45 and 90 days, respectively. Royal Delicious apples showed comparatively less disease. On average, 3-5 scab lesions developed per fruit. Scab infected apples were unfit for storage due to pronounced shrinkage and rotting caused by other fungi. Pre-harvest sprays of captan (0.2%) exhibited maximum reduction in storage scab, percentage disease control being 85, 80 and 74% at 45, 60 and 90 days, respectively, followed by bitertanol (0.075%) and carbendazim (0.05%). Pre-harvest sprays of carbendazim and captan were 100% effective in controlling postharvest fruit decay for 60 days. Postharvest dip treatment of apple fruits in bitertanol (0.075%) gave maximum control of storage scab up to 90 days, followed by carbendazim and captan. Carbendazim dip treatment, however, completely controlled the fruit rotting in common storage for 3 months.
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