to Pestalozzia. The former is found more abundantly than the latter. Mr. K. 

 Yoshiuo of Kumamoto made careful study of this Glce'>sporium, .and found its 

 ascospore-stage. He named it Glomerella Cinnamomi* The Gloeosporium stage 

 of the fungus may be. described as follows : Spots 76p SO//, in diameter ; 

 spore masses at first light salmon-colored, later becoming paler. Conidia linear 

 oblong, straight or slightly curved, hyaline, one-celled, 11 13/^x2.6 5.2^. 

 According to Yoshino, perithecia are single, or sometimes two of them growing 

 side by side ; subepidermal, brown, round or elliptical, usually 100 150/* in diam., 

 upper part somewhat swollen making a neck-like process with a roundish opening 

 at its extremity. Asci many, each with 8 ascospores; fusiform, 46 60//,x8 

 13; ascospores, colorless, oblong, tapering at both ends curved to one side, 

 10 ISfjL x3 5//. 



The description of the Pestalozzia may be given as follows: Spots 4 m.m. in 

 diameter ; conidia club-shaped, 18.2 x 5.2/A, 3 septate, the terminal first coll 

 hyaline, with 3 hyaline hairs each 5.2/i 6.4/z, long, the rest of the cells faiatly 

 colored. 



In order to determine the cause of the disease I made the following 

 experiments. In November, 1905, took five healthy leafy branches of the camphor 

 tree 2 dm. long ; and they were put in glass bottles with water. Each branch was 

 placed in a separate bottle and kept under a bell jar. On two of them the larvae 

 nnd imagoes of Phleothrips nigra, each ten in number, were placed ; two of the'other 

 branches I tried to infect with the Gloeosporium by spraying the water containing 

 the fungus spores, while the remaining one was kept for comparison. After three 

 days both of the branches with the insects were marked with brown diseased spots 

 which became black after a week ; while other two branches with the fungus spores 

 together with the fifth branch for control were quite healthy for three weeks longer, 

 when the younger parts of the branches began to die, while the older parts \vere 

 quite healthy. At this time the branches with the insects were quite dead with 

 blackened epidermis, on which the Gloeosporium by natural infection was formed in 

 abundance. In August, 1907, I repeated the experiment to infect the young 

 camphor tree with the Gloeosporium spores. The result was again negative. 



From these experiments, I came to the conclusion, that the black spot disease 

 of the camphor tree is originally caused by the parasitic insect, Phleothrips nigra 



*On Black Rot of Camphor tree, Tokyo Bot. Mag. IX ; 1907. 



