Studies On Fungal Diseases Of Five Garden Plants In Jilin Province

Garden plants play an important role in town and country construction. With the increasingof cultural area and environmental contamination, the value of landscape encounteredseriously threatening by the plant disease. The disease control effect improved on the bases ofdisease diagnosed correctly and timely. The scientific and accurate description of the diseasesymptoms was the fundamental of early recognition and diagnosis of the disease. The pathogenidentification, and the biological characteristics were the foundations of the occurrence anddevelopment of the disease and disease management. The susceptiblily of the pathogen to thefungicides was the most important way to select effective fungicides to the disease control.The results of the research as followed:1. Five diseases which are Daylily leaf streak, Pachysandra leaf blight, Weigela floridablack spot, Impatiens walleriana damping-off, Bedding begonia damping-off were reported.The symptoms of the five diseases were described in detail.2. The pathogens obtained from diseased plants fulfilling Koch’s postulate. According tothe morphological and cultival characteristics, ITS-rDNA sequence analysis, the pathogens ofDaylily leaf streak, Pachysandra leaf blight, Weigela florida black spot, Impatiens wallerianadamping-off, Begonia damping-off were identified as Kabatiella microsticta Bubak (syn.Aureobasidium microstictum (Bubak) W. B. Cooke), Volutella pachysandricola B.O. Dodge,Alternaria alternata (Fr.) Keissler, Rhizoctonia solani Kühn AG4-HG-I, Rhizoctonia solaniKühn AG1-IB, respectively.3. Biological characteristics of five pathogens were studied, such as influences of differentcarbon source, nitrogen source, temperature, pH, dry mycelium weight on mycelium growth.The effects of pH, temperature and light on spore germination, lethal temperature of myceliumand conidia of pathogen were also tested.4. Fungicides were screened for control of four fungal diseases with methods of myceliumgrowth rate indoor. The results showed that Paenibacillus Polymyza WP, Bacillus Subtilis WP,Jingangmycin Bacillus cereus8%32%WP, Endophytic Bacillus WP, Flusilazole Prochloraz25%SL, Carbendazim50%WP, Difenoconazole30%SE, Thiophanate Methyl70%WP werethe best pesticides to the pathogen of Daylily leaf streak; Bacillus subtilis WP, Trifloxystrobin Tebuconazole25%50%WG, Propiconazole25%SE, Hymexazol70%SP were the bestfungicides to the pathogen of Pachysandra leaf blight; Triflumizole30%WP, ThiophanateMethyl70%WP, Iprodione50%WP, Dimethachlon40%WP, Tebuconazole25%EW were the best fungicides to the pathogen of Weigela florida black spot; Endophytic Bacillus WP, BacillusSubtilis WP, Trifloxystrobin Tebuconazole25%50%WG, Flusilazole40%EC were the bestfungicides to the pathogen of Impatiens walleriana damping-off disease; Chlorothalonil75%WP, Trifloxystrobin Tebuconazole25%50%WG, Pyraclostrobin25%EC, Procymidone50%WP were the best fungicides to the pathogen of Begonia damping-off disease. These fungicidesshould be the preferred ones for the field trials.5. Daylily leaf streak, pachysandra leaf blight, perpetual Weigela black spot were firstlyreported in China.