Pathogen Identification And Fungicide Screening Of Main Soil-borne Fungal Diseases On Spathiphyllum Cannifolium In Guangzhou

Spathiphyllum cannifolium is one of the important indoor foliage plants. It is very popular among the public for its tolerance of shade and wide range of adaptability. Soil-borne fungal diseases had a great influence on its production. Pathogen identification and fungicide screening of main soil-borne fungal diseases on Spathiphyllum cannifolium in Guangzhou were carried out in this thesis. The results were showed as follow:1. The disease samples were collected from different production bases in Panyu, Baiyun and Conghua district of Guangzhou in Sept. to Dec. of 2012. The causal organisms were isolated, cultured and identified as Cylindrocladium spathiphylli and Phytophthora nicotianae via pathogenicity test and morphological observation.2. The result of inhibition test of 10 fungicides, i.e. Difenoconazole, prochloraz, azoxystrobin, fine metalaxyl+fludioxonil, fine metalaxyl+hymexazol, fludioxonil, fluopicolide+propamocarb hydrochloride, aluminum phosphine, cymoxanil+mancozeb and metalaxyl, to two pathegens, showed that fluopicolide+propamocarb hydrochloride and metalaxyl had excellent inhibition effect on the mycellium of Phytophthora nicotianae, which EC50 was less than 1.0 μg/m L; prochloraz had significant effect on Cylindrocladium spathiphylli, which EC50 was less than 0.001 μg/m L; fludioxonil had effect on Cylindrocladium spathiphylli, which EC50 was less than 5.0 μg/m L. The field experiment results showed that fine metalaxyl+fludioxonil and fine metalaxyl+hymexazol had a good preventive effect. Therefore, fine metalaxyl+fludioxonil and fine metalaxyl+hymexazol were the best fungicides recommended for the two diseases control.