Abstract:

In order to elucidate the biological characteristics and suitable fungicide for the pathogen of canna leaf spot Alternaria alternate, provide a scientific basis for the disease control. The biological characters of Alternaria alternata, the pathogen of Canna indica leaf spot, as well as the fungicides against the pathogen were investigated in this paper. The results indicated that the pathogen hyphe were grown well under 28℃, pH=7, sugar and NaNO3 as carbon and nitrogen resource respectively. The lethal temperature was 45℃. On the other hand, the light-dark alternation and aeration condition were not significant influence on the mycelium growth. The most effective fungicide was 10% difenoconazole among the 5 tested reagents, and the relative inhibition rate was 100% under the recommended concentration.