Perpetuation and epidemiology of Colletotrichum gloeosporioides causing anthracnose in mango.

摘要

In an experiment conducted in Jammu and Kashmir, India, mango leaves infected with C. gloeosporioides [Glomerella cingulata] were either buried in the soil under mango trees at various depths (4, 8 or 12 cm deep), half buried in the soil, hanged from the branches of a mango tree, or maintained in the laboratory under ambient conditions (25 degrees C). The degree of survival of the pathogen decreased through time. The pathogen was recovered from buried leaves up to 90, 75 and 60 days after burying at depths of 4, 8 and 12 cm, respectively. However, the pathogen survived longer when the leaves were partially buried in the soil (150 days), hanged in a wire gauge from the branch of a tree (210 days), or kept under laboratory conditions (225 days). The effects of meteorological conditions on anthracnose incidence in mango (cv. Dashehari) were also studied. Rainfall, maximum and minimum relative humidities, and maximum and minimum temperatures were positively correlated with anthracnose incidence. Rainfall showed the greatest correlation with disease incidence.