樟子松叶枯病的发生为害和病原菌

1985年在内蒙古阿尔山林业局樟子松人工林内,大面积针叶枯黄早落,严重影响树木的生长和结实。经人工诱发病害试验和林内定点观察研究结果,该病害是由沟小散斑壳菌(Lphodermella sulcigena(Rostr.)H(?)ha)引起的传染性病害。讨论了(Lophodermella sulcigena)与松生壳蠕孢菌(Hendersonia acicola)的关系。

STUDY ON BIOLOGICAL CHARACTERISTICS OF HENDERSORNIA ACICOLA

The morphological and cultural characteristics of Hendersonia acicola Munch & Tub,, isolated from the needles of Pinus sylvestris var. mongolica Litvin, were described. The fungi was cultured on three kinds of media and the speed of mycelial growth and the required time to produce conidia were different. On the medium of needle decoction agar, the fungi grew fast and produced conidia after 5 days culturing. On PDA came second and it needed 7 days to produce conidia. On the medium of maize flour agar, it grew slowly and produces conidia after 27 days incubating. The fungi cannot produce conidia under darkness on all three kinds of media.The conidia can germinate at 8℃ -28℃. The optimum conditions for conidia to germinate are 25℃, RH 100% and pH 4 and under these conditions it only takes four hours for conidia to germinate. The conidia germination is not affected by

松针壳蠕孢生物学特性的研究

从樟子松(Pinus sylvestris var.mongolica)针叶上分离到松针壳蠕孢(Hendersonia acicola Munch & Tub.)真菌,并描述其形态特征。在三种培养基上培养,结果松针汁琼脂培养基上的生长快,5d后产生分生孢子;PDA次之,7d后产生分生孢子;玉米粉琼脂培养基生长最慢,27d后产生分生孢子。在无光照条件下的三种培养基上均不产生分生孢子。分生孢子在8—28℃下均能萌发,但以25℃、pH值为4、相对湿度为100％,萌发最快。光照对孢子萌发影响不大。