Investigation of pre and postharvest pathogens caused mangosteen fruit rot
N. Khewkhom, T. Sangsiri and S. Shangchote
Book of abstracts, APS2010 & SEAsia2010 & GMS2010, August 2-4, 2010, Radisson Hotel, Bangkok, Thailand
2010
บทคัดย่อ
The specific objective of research provided a perspective on the status of mangosteen (Garcinia mangostana) diseases in East of Thailand. A number of diseases were observed at different intensities in the orchards visited. The incidence of major fungal pathogens determined by isolation from persistent sepals of mangosteen fruits in 7 maturity stages since 15-110 days to postharvest period. These pathogens included Pestalotiopsis sp., Phomopsis sp., Lasiodioplodia theobromae, Colletotrichum gloeosporioides, Phoma sp. and Fusarium sp. Incidence of Pestalotiopsis sp. associated with persistent sepals 41.1-74.4% in all stages. Fruit hardening occurred after infection in all stages especially young fruits. Postharvest fruits from 7 orchards were found incidence of Pestalotiopsis sp., Phomopsis sp. and L. theobromae at 46.3, 22.5 and 19.1 % respectively. The results suggest that earliest indicator of fruit rot incidence at harvest may was the infection level in flowering. Pestalotiopsis sp. and L. theobromae were wound inoculated in depth 2 mm on fruit surface. Inoculated fruits with both fungi did not appeared necrotic lesions on surface of fruits after incubation 14 days at 25°C. L. theobromae and Pestalotiopsis sp. developed into small patches of epidermis and radial sections through the surface in 2 and 4 mm depth, respectively. Mycelium was found inside when making cross section fruit and fruits hardened.