Folia Horticulturae

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The effect pf selected herbicides on pathogenicity and growth of Nectria galligena Bres.

Zbigniew Burgieł, Marek Grabowski

Department of Plant Protection
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland

Herbicides tested in vitro showed an inhibiting effect on the development of the Nectria galligena mycelium. The strongest fungistatic activity was observed when Kerb 50 WP was applied. The lowest herbicide concentration in the medium caused a 21 and 30% lower growth of the colony than that of the control. A less strong activity against the mycelium of Nectria galligena was observed when preparation Basta 150 SL was applied, and the least strong activity was shown by Roundup. All the herbicides applied in high concentrations caused changes in the morphology of the mycelium. The results of the study showed that the presence of herbicides in the inoculum can increase or decrease the size of the lesions caused by the pathogen on shoots. An increase in the extent of lesions was observed when they were infected by the mycelium derived from PDA-medium containing Roundup. The inoculum obtained from cultures where glufosinate (Basta 150 SL) and propyzamide (Kerb 50 WP), 10, 100 mg cm-3 were applied showed higher pathogenicity to apple shoots.

Burgieł Z., Grabowski M., 1996. The effect of selected herbicides on pathogenicity and growth of Nectria galligena Bres. Folia Horticulturae 8/2: 13-19.