STUDY ON SEEDLING DISEASES OF MANGO (Mangifera indica) IN SOME SELECTED AREAS OF BANGLADESH

Abstract

Occurrence and prevalence of disease of mango was studied in eight nurseries located at Dhaka, Gajipur, Barisal and Khagrachari district during July 2010 to April 2012. Altogether three diseases were recorded during the survey. The disease, in order of prevalence (Incidence and severity) was Anthracnose (66.79 and 55.13), leaf spot (65.84 and 56.21) and sooty mould of mango (24.18 and 12.08). The fungi Colletotrichum gloeosporioides, Pestalotiopsis mangiferae were identified under compound microscope from anthracnose, leaf spot infected leaves. However, sooty mould (Capnodium roseum) was recorded only on the basis of symptoms observed. The prevalence of recorded three diseases varied to each other with respect to nursery and its location. Among the three diseases recorded two disease viz. Anthracnose and leaf spot were studied to see their relation with temperature and relative humidity. A positive correlation was observed between prevalence of anthracnose and leaf spot with temperature and relative humidity. The highest prevalence of anthracnose and leaf spot was observed in the month of October and lowest in the month of January. In terms of relative humidity a positive correlation was observed between prevalence of leaf spot and prevalence of sooty mould of mango. The prevalence of leaf spot and sooty mould was in the month of October and no prevalence observed in the month of January. Thus leaf spot is being reported as a most severe disease of mango seedlings in the country.