Diaporthe (Phomopsis) spp. on weeds as possible causative agents of sunflower stem canker in the Vojvodina Province [Yugoslavia]
1994
Mihaljcevic, M. (Faculty of Agriculture, Novi Sad (Yugoslavia). Institute of Field and Vegetable Crops) | Vukojevic, J.
This paper considers an hypothesis that Diaporthe (Phomopsis) spp. on weeds were the initial inoculum which, in the early 1980's triggered the epiphytotics of the sunflower disease caused by Diaporthe (Phomopsis) helianthi in Vojvodina (Yugoslavia). A study on more than 50 weed species conducted in 40 locations, found 18 Diaporthe and Phomopsis isolates. Correlation between individual weed species populations and the frequency and intensity of occurence of disease symptoms, ascomata and conidiomata was low. A separate analysis studied the reaction of sunflowers to two of the three Phomopsis species isolated from Xanthium italicum. The conclusion that the extensive presence of Phomopsis helianthi on diseased sunflower plants in Vojvodina is solely responsible for epiphytotic outbreaks of Phomopsis, is still valid.
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