多变茎点菌的一个新变种

A NEW VARIETY OF PHOMA EXIGUA

1986—1988年对30份辣椒(capsicum annuum)种子样品进行了带菌检验,从23份样品上分离到多变茎点菌(Phoma exigua,异名Ascochyia phaseolorum)。进一步鉴定结果表明,其中2份样品的分离物为Phoma exigua var. wxigua Desm.。21份样品的分离物为多变茎点菌的一个新变种(Phoma exigua var. capsici Liang),带菌率为0.5—65.5%。

A new isolate of Photon exigua was found in 21 seed sampies of chilli (Capsicum annuun) out of 30 tested with infection ranging from 0.5—65.5% in Beijing, China. The new isolate has a quicker growth rate than that of Phoma exigua var. exigua Desm. and its colony on potato dextrose agar has an entire margin. This type of growth is dominated by black tinge and it showed no colour reaction when NaOH was added. In pathogenicity tests the isolate could produce round or irregular lesions on leaves of chilli.According to our ob(?)ervations, this isolate dose not agree with any of the 5 described varieties of Phoma exigua by Boerema (1967) and Sutton (1980) except for morphological similarity of conidia. Therefore, it is considered to be a new variety and named Phoma exigua var. capsici Liang.