Diseased plants as a source of dissemination of mango sudden death disease in healthy mango plants
2012
Saeed, S. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Entomology) | Masood, A. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Entomology) | Khan, S.M. (Bahauddin Zakariya Univ., Multan (Pakistan). Dept. of Plant Pathology)
Infected mango trees serve as a source of inoculums of fungi that are involved in disease dissemination to healthy trees of the same orchard. In order to prove this hypothesis, two different mango orchards were selected on basis of management practices. A layout plan of diseased and healthy mango trees was designed that was comprised of 2 diseased out of 25 mango trees in one field and 10 diseased out of 32 trees in second field. In first year of observation, ratio of disease spread was much lower in field-1 than the field-2 because of the better ploughing, timely irrigation and nutrients particularly farm yard manure was applied according to the requirement of trees. In field-1, out of 25 trees, 16% diseased and 8% disease initiations trees were observed as compared with field-2 in which 53% diseased, 9% disease initiations whereas 18% dead, 9.3% trees were uprooted found dead by this disease. During year, 2007, field-2 was severely infected due to presence of maximum disease inoculums, deep ploughing, less nutrition, no weed control and without earthen ring around the stem resulted in 60% trees death due to this disease. In second year of observation, situation of field-1 illustrated that the disease transmission was spreading very quickly due to improper management, 28 % trees were uprooted. Trees adjacent to the diseased trees were frequently attacked as compared to the distant trees. It is concluded from this study that presence of infected trees and improper management practices would ultimately lead to the collapse of the whole mango orchard.
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