บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Stem-end rot diseases of tropical fruit - mode of infection in mango, and prospects for control.

Johnson, G. I.; Mead, A. J.; Cooke, A. W.; Wells, I. A.;

Development of postharvest handling technology for tropical tree fruits: a workshop held in Bangkok, Thailand, 16-18 July 1992. Year: 1994 Pages: 72-76 Ref: 14 ref.

1994

บทคัดย่อ

Stem-end rot diseases of tropical fruit - mode of infection in mango, and prospects for control.

ABSTRACT

In Australia, Dothiorella spp. are generally the main cause of stem-end rot of mango. In mango, postharvest losses do not result from infection at flowering or fruit set and fruitlets infected at this time are aborted. Natural infections by Dothiorella spp. reappear in stem-end tissue (10% affected) of fruit 11 weeks after full flowering and are more prevalent in the peduncle (60% affected) at that time. All fungi which cause stem-end rots of mango (Dothiorella dominicana, D. mangiferae, Phomopsis mangiferae, Lasiodiplodia [Botryodiplodia] theobromae, Cytosphaera mangiferae and Pestalotiopsis sp.) were found as endophytes associated with healthy stem tissue prior to inflorescence emergence. Some of these fungi progressively colonized the inflorescence tissue, and were present in the pedicel tissue of some fruit 8 weeks after flowering. It is suggested that stem-end rot pathogens are endophytes occurring widely on mature branches of mango trees. Mycelia of the fungi colonize inflorescence tissue

as it matures and in certain conditions, reach the stem end of fruit. Infections then remain latent until after harvest or until the unharvested fruit senesce. It is concluded that control of this disease may be achieved by slowing down the colonization process so that the fungi do not reach the stem end of fruit before harvest. It is suggested that factors which may affect colonization include watering regimes, defoliation and pruning practices.