52 U.S. DEPT. OF AGRICULTURE MISC. PUB. 939 



Ginkgoaceae — Ginkgo biloba (very susceptible) 

 Pinaceae — 



Picea excelsa (Planted in Japan) 



Larix leptolepis 



Pinus parvi flora, P. densiflora (very susceptible) 



P. strobus (very susceptible) (Planted in Japan) 



P. taeda (very susceptible) (Planted in Japan) 

 Taxodiaceae — Cryptomeria japonica 



Cupressaceae — Thuja occidentalism Ohamaecyparis obtusa 

 Salicaceae — 



Populus maximowiczii, P. nigra (Planted in Japan) 



P. nigra X P. maximowiczii ("Kamabuchi"-1) (very suscepti- 

 ble) , Salix bakko 

 Juglandaceae — 



Juglans sieboldiana (very susceptible) 



Platycarya strobilacea 

 Fagaceae — 



Castanea crenata (very susceptible) 



C. mollissima (very susceptible) (Planted in Japan) 



Quercus acutissima 

 Ulmaceae — 



Ulmus pumila 



Celtis sinensis 

 Moraceae — 



Broussonetia kazinoki (very susceptible) 



Ficus carica 



F. elastica 



Moms alba (very susceptible) 

 Magnoliaceae — Liriodewdron tidipifera (very susceptible) (Planted 



in Japan) 

 Platanaceae — Platanus orientalis 

 Kosaceae — 



Malus pumila (very susceptible) 



Prunus serrata (very susceptible) 

 Leguminosae — 



Cercis canadensis (Planted in Japan) 



Robinia pseudoacacia (very- susceptible) (Planted in Japan) 

 Anacardiaceae — Rhus vemiciU'iia (very susceptible) 

 Aceraceae — Acer campestris (Planted in Japan) 

 Literature : 



Ito, K. Studies on "Murasaki-monpa" disease caused by Helico- 



basidium mompa Tanaka. Bui. Govt. Forest Expt. Sta. 43: 



1-126. 1949. 

 Suzuka, N., et al. Studies on the violet root rot of sweet potatoes. 



(Japanese with English resume.) Bui. Natl. Inst. Agr. Sci. Sr. 



C. 8 :1-173. 1957. 



Needle Blight and Canker of Cryptomeria 



Gercospora cryptomeriae Shirai. First symptoms on seedlings are 

 brownish discoloration in needles and stems. Infected needles and 

 twigs become dark brown and die. Under favorable moisture con- 

 ditions, needle and twig blight progresses rapidly and causes the 

 death of seedlings. Young, vigorously growing shoots and stems 

 become infected around the base of a diseased needle or small twig. 



