金叶女贞假尾孢病害的生物学特性和杀菌剂筛选

Biological features of the disease of Ligustrum vicaryi caused by Pseudocercospora sp. and screening of the fungicides

金叶女贞在6～7月和9～10月叶片上会出现许多不规则形状的病斑,俗称叶斑病,严重时会导致受害叶片早落.经研究其病原为假尾孢真菌Pseudocercospora sp..通过人工接菌,观察了病害的症状、发病规律、培养特性、形态特征,以及温度、pH对菌丝体生长的影响.经室内杀菌剂筛选试验,用10 g/L百菌清杀菌效果较好.

From June to July and from September to November, there are plenty of leaf-spots on Ligustrum vicaryi. An epiphyte was separated from the sapless leaf and that epiphyte was researched on the modality, the biology character and the indoor filtration of the medicament of prevention and cure. Result enunciate there are many mycelia but no spore. Roughly identified, the epiphyte was alleged Pseudocercospora sp. The optimum temperature for the mycelia of the epiphyte was (25 ℃), and the temperature of (10 ℃) hereinafter and (35 ℃) hereinbefore can restrain sprouting of the mycelia. The optimum pH for the mycelia of the epiphyte was 6. The disease can be controlled effectively by chlorothalonil.