ニホンナシ黒星病菌 Venturia nashicola 子のう胞子および分生子の分散

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The dispersion of two kinds of spores of Japanese pear scab fungus, ascospores and conidia, was investigated. The maximum discharged height of ascospores was about 7.67 mm from pseudothecia produced on the surface of leaf. On the other hand, the average number of ascospores trapped at 10-cm height from the soil surface of orchard where was covered with dead pear leaves having a lot of pseudothecia was 121 per one cover glass (18 mm square). The number of trapped spores gradually decreased with increase of height, and average 3 spores were trapped at 180-cm height which was almost the same or higher compared to the height of trellis of Japanese pear trees, and the correlation equation obtained from the experiment was Y=78.886e^<-0.0199x>. The dispersal distance of ascospores from the inoculum source was at least 10 m, and the correlation equations obtained from the experiments were Y_1=11.429^<-0.175x> (in the east direction), Y_2=20.352e^<-0.281x> (in the west), and Y_4=18.344^<-0.238x> (in the north). On the basis of the equation of Y_1, percentage of diseased leaves was predicted as 1% at the distance of 14 m from the inoculum source. The dispersal distance of conidia from the inoculum source was at least 8 m, and the correlation equations obtained from the experiments were Y_1=25.586e^<-0.184x> (in the east direction), Y_2=24.66e^<-0.152x> (in the west), Y_3=25.396e^<-0.254x> (in the south) and Y_4=23.714e^<-0.209x> (in the north). On the basis of the equation of Y_3, percentage of diseaed leaves was predicted as 2 % at the distance of 10 m from the inoculum source and 0.6% at 15m.
日本植物病理学会の論文
1990-10-25

ニホンナシ黒星病菌 Venturia nashicola 子のう胞子および分生子の分散

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