Anthracnose disease of Manglietia conifera Dandy seedlings in nursery

Pham Quang Thu

Forest Science Institute of Vietnam 

Manglietia connifera Dandy young seedlings in the nursery are often infected with anthracnose disease, with a very high disease incidence in low-light and too high soil moisture condition. The pathogen is determined by the fungus Colletotrichum gloeosporioides (Penz.) Sacc (anamorphic stage). Sexual stages (telemorph) of the fungus are Glomerella cingulata (Stoneman) Spald. & H. Schrenk being found on diseased leaves.

Typical symptoms of the disease are leaf spots, and infected leaves turning dark brown. These infected trees are stunted, and have bad form affecting the quality of seedlings for planting. Heavily infected trees impacted in leaves and stem are going to be wilt and die. This pathogen is recorded for the first time causing anthracnose disease to Manglietia connifera Dandy seedlings in a nursery in Vietnam. The fungus starts to infect to the Manglietia connifera seedlings at the end of February and early March when temperature and relative humidity is increasing, and the seedlings producing new leaves. At that time conditions are suitable for germination of conidia of Colletotrichum gloeosporioides. The germination rate of the conidia depends on temperature,  at 27-300C the germination rate of the conidia is 50.6% and 90.1% after 6 hours and 48 hours respectively.

To prevent the anthracnose disease, some techniques should be consideration and implementation as follows: nursery has good drainage, suitable shade conditions for each growth stage of the seedling are provided along with good air circulation. Do not place the seedlings too densly, in the bed – the ideal interval is every 7 to 10 rows of seedling. Fungicides such as carbenzim 500FL, daconil 500SC, or ridomil gold 68WG are used to control disease in high disease incidence.

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