Factors enhancing incidence of mango decline disease complex in Sindh, Pakistan
2007
Panhwar, A. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Protection) | Abbasi, Q.D. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Protection) | Nizamani, S.M. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Plant Protection) | Khuhro, R.D. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Entomology) | Rustamani, M.A. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Entomology)
Investigations were carried out to diagnose the factors enhancing incidence of mango decline disease complex, in Sindh Pakistan. The observations were recorded on the basis of disease symptoms, including decaying of barks, a common disease symptom, that gradually involved the entire trunk, causing blockage of xylem vessels and death of tree within few months. The results indicated that majority of the orchards, when irrigated through tube wells, with low frequency of irrigation, were poorly managed and suffered severely from the disease incidence, but the correlation of the disease incidence with irrigation frequency was negative (r = -0.6330). The disease incidence increased in the stressed orchards due to deficiency of nutrients, shortage of water, irregularly monitored and having no preventive/cultural measures against the disease. The evidence further revealed that maximum mean disease incidence on different aged mango trees observed during higher temperature (24.85 to 33.35 degree C) and relative humidity (50 to 79%) from March to October, showing the highest incidence in June, July and August. Whereas, the fresh disease incidence decreased during cool months from November to February, with the lowest incidence in January and December. Correlations of the disease incidence with temperature (r = 0.9461) and relative humidity (r = 0.3296) were positive.
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