Abstract
Peduncle dry rot disease was a new disease of sweet orange, causing loss of productivity. The disease samples were collected in Dong Thap province for observing symptoms, isolating pathogen and testing disease-causing ability by Koch’s postulates of 8 fungal isolates, the results showed that six out of eight isolates expressed ability to cause peduncle dry rot on sweet orange in garden condition and LVg-4 was isolate causing the highest disease incidence. The causal agent for peduncle dry rot disease was identified as Colletotrichum gloeosporioides by morphological characteristics and by sequencing the internal transcribed spacer regions of rRNA. The result obtained from this study will contribute for the next study on management of peduncle dry rot disease of sweet orange in Dong Thap province.
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