STUDIES ON THE INCIDENCE AND CONTROL OF BLACK TIP OF MANGO (MANGIFERA INDICA L.)
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Date
2003
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
A study to determine the incidence and susceptibility of black tip disorder in mango (Mangifera indica L.) and to evolve most suitable control measures was conducted at orchard of F.A.O., Division of Pomology and Post Harvest Technology, Udhywala during 2000 - 2001. Survey conducted in different mango growing areas around brick kilns in Jammu revealed that maximum incidence of black tip was observed in cultivar Dashehari (35%) and least in case of Langra (15%). The distance from the kiln or other sources of hydrocarbon emission influenced the disorder maximum at 0.5 km and decreased with the increase in the distance. Soil and leaf nutrient analysis of these areas revealed that soil and leaf nutrient status did not influence the disorder so far as their severity was concerned. Wind direction which did not maintain any static behavior had little influence on prevalence of this disorder. Prevalence of black tip was found inversely related to the height of chimney. Study on the chemical control of black tip revealed that maximum control (3.1%) was observed with the application of 1 percent washing soda and all other treatments were significantly superior to control. Pooled data studies regarding the changes on the qualitative parameters by chemical treatments revealed that maximum yield (15.42 kg tree<sup>-1</sup>), length (9.91 cm), breadth (5.95 cm), fruit weight (153.79 g) and TSS (17.57 %) was observed bv 1 percent borex spray closely followed by 0.8 percent borex. Minimum length, breadth and fruit weight was observed in control. Same order of response to the treatment was followed by volume. Specific gravity remained statistically unaltered.
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