INFECTIVITY AND PATHOGENICITY OF LEPTOSPHAERIA CONIOTHYRIUM AND OTHER STEM INHABITING FUNGI ON RASPBERRY CANES

During the growing season of 3 years raspberry canes were inoculated at the lower, middle and upper part with Leptosphaeria coniothyrium and the following other fungi:

Acremonium sclerotigenum	Didymella applanata
Alternaria alternata	Fusarium avenaceum
A. tenuissima	F. culmorum
Botrytis cinerea	Hendersonia rubi
Cladosporium cladosporioides	Phoma exigua
C. herbarum	P. macrostoma
Colletotrichum gloeosporioides

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.

Symposium on Breeding and Machine Harvesting of Rubus and Ribes

E. Seemüller

https://doi.org/10.17660/ActaHortic.1976.60.6