INFECTIVITY AND PATHOGENICITY OF LEPTOSPHAERIA CONIOTHYRIUM AND OTHER STEM INHABITING FUNGI ON RASPBERRY CANES
|Acremonium sclerotigenum||Didymella applanata|
|Alternaria alternata||Fusarium avenaceum|
|A. tenuissima||F. culmorum|
|Botrytis cinerea||Hendersonia rubi|
|Cladosporium cladosporioides||Phoma exigua|
|C. herbarum||P. macrostoma|
Uninjured canes were only infected by L. coniothyrium, D. applanata and P. exigua. At the lower and middle inoculation points all infections remained superficial and only at the upper points L. coniothyrium and - less often - D. applanata were able to invade the entire stem. On needle punctured canes most of the fungi examined caused infections which remained in most cases superficial or very limited. Only L. coniothyrium proved to be highly pathogenic. It had mostly killed the canes before the following spring. This fungus was also able to penetrate canes which were only superficially injured with carborundum. The group of weakly pathogenic fungi which hardly affected the canes includes D. applanata, B. cinerea, C. gloeosporioides, F. avenaceum, F. culmorum, and P. exigua. The other fungi were not able to damage the canes at all.