Association of Diplodia pinea with a root disease of pines in South Africa.

摘要: WINGFIELD, M. J., and P. S. KNOX-DAVIES. 1980. Association of Diplodiapinea witha root dise3sc pines in South Africa. Plant Disease 64:221-223. Diplodia pinea is an important factor a disease Pinus eJ/iotljj taeda various parts Africa Swaziland. All stands which the dise3se occurred were severely stressed. (Desm.) Kickx occurs throughout conifer-growing areas world associated with wide range symptoms, including bark cankers, bud wih, dead top, seedling blight, collar rot, staghead, twig blight (1,3,4,9,12). In Africa, D. causes serious dieback patula Sch!. & Cham., pinaster Ait., radiata Don. after hail (5,7,8) regarded as most pathogen pine plantations (8,15). Control largely by restricting planting susceptible species to where iamage limited (5,6) replacing ISceptible more tolerant elliottii Engelm. L. summer rainfall area (5-7). Since 1975, extensive losses have been caused belonging Usutu Pulp Company Swaziland (D. G. Donald, personal communication). During preliminary survey local forest tree diseases, senior author examined diseased trees observed similar symptoms on plantings This paper describes association Part M.Sc. thesis be submitted University SteUenbosch. Accepted for publication 17 September 1979. 00191-2917/80/000050$03.00/0 01980 American Phy1opathologicaJ Society