Studies On Fungi Pathogens And Control Of Cool-Season Turfgrass Root Diseases In Zhengzhou

Through investigating, isolating and pathogen identifying, we found the pathogens of turfgrass root disease in Zhengzhou area were Fusarium spp., Rhizoctonia spp., Drechslera spp., Curvularia spp. and Pythium spp. etc. Fusarium and Rhizoctonia were positively correlated with turfgrass root diseases prevalence, Alternaria was negatively correlated, and the other fungi have no obviously correlation. F. solani and Rh. solani(AG-4) had the more isolating frequency and the severe virulence. So we think that the two pathogens were the dominant pathogens of turfgrass root diseases in Zhengzhou area.Through testing resistance of 29 cultivar (belong to Poa spp., Lolium spp. and Festuca spp.), the result indicated that: in test of inoculation of Rh. solani, for Festuca spp. resistant variety were Gold island, Juguar 3, Hound dog 5 and Fire phoenix, for Poa spp. were no, for Lolium spp. were Sonoran and Bison. In test of inoculation of F. solani, for Festuca spp. resistant variety were Roby and Gold island, for Poa spp. were Park, Bluechip and Blue moon, for Lolium spp. were Bason and Sakini. In test of inoculation of Pythium aphanidermatum, for Festuca spp. resistant variety were Juguar 3, Gold island and Hound dog 5, for Poa spp. were no, for Lolium spp. were Bason, Sakini and Tirna. In test of mixed inoculation of Rh. solani, F. solani, and P. aphanidermatum (1:1:1), for Festuca spp. resistant variety were Juguar 3 and Roby, for Poa spp. were Merit and Bluechip, for Lolium spp. was Caddiesshack.Result of test of pot cultivated and virulence of fungicides indicate: for turfgrass root disease caused by Rh. solani, effective obviously fungicides was Iprodione, and Paecilomyces lilacinus, RH, R16 and B01 (bacterium) were effective antagonists. Control effects were 66.3%, 56.3%, 50.6%, 44.2% and 53.0% separately, and results of Duncan' s One-way ANOVA shown that there are no remarkable difference in the above-mentioned 5 kinds of inhibitor under 5% remarkable level. Control effect of mixed fungicides (Triadimefon+Thiram) up to 55.1% obviously, better than Triadimefon (52.2%) and Thiram65(40.1%) separately.Result of test of pot cultivated and virulence of fungicides indicate: for turfgrass root disease caused by F.solani, effective obviously chemical fungicides was Iprodione, and R16 and B01 (bacterium) were effective antagonists. Control effects were 64.9%, 70.5% and 65.4% separately, and results of Duncan1 s One-way ANOVA shown that there is no remarkable difference in the above-mentioned 3 kinds of inhibitor under 5% remarkable level. Control effect of cotton seedling protective agent (CSPA), Triadimefon and mixed fungicides (Triadimefon+Thiram) were 64.1%, 42.3% and 46.5% separately.