Rot disease on Docynia indicafruit in Vietnam
Keywords:
Colletotrichum siamens, Docynia indica, pathogenicity,, rot diseaseAbstract
Docynia indica, a special tree, has been cultivated widely in the Northwest
of Vietnam. The area of D. indica plantations is about 3,200 hectares,
commercial harvesting yielded 6,500 tonnes of fruit per year. However, rot
disease on D. indica fruit is quite common, causing significant damage and
looses. This study aims to describe the symptoms, pathogenicity and
identify the pathogen that causes rot disease on D. indicafruit. The twenty -
one isolates of fungi associated with rotten fruits were isolated and the
pathogenicity of those 21 isolates was divided into five groups including:
very strong (5 isolates), strong (4 isolates), average (5 isolates), weak
(4 isolates)and nil (3 isolates). In which isolate TM2 has the strongest
pathogenicity and causes lesions similar to those of natural rotten fruit.
Colletotrichum siamensewas identified as the fungus causing rot disease
on D. indica fruit by sequencing of ITS1 and ITS2 using primer pair ITS1F
and ITS4. This is the first report of C. siamensecausing rot disease on
D. indica fruit in Vietnam, but they are recorded as pathogen in many plant
species, so further research is needed to manage the diseas
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