A study of Sensitivity of Phoma asparagi Sacc.Infecting in Asparagus to Fungicide Thiophanate methyl

The sensitivity of Phoma asparagi Sacc.infecting in asparagus to the fungicide,thiophanate methy1,was tested.The results showed that the sensitive period of asparagus infected by P.asparagi was in 1～5 days after germinating.The resistant ability of the plant to P.asparagi was higher and higher as the asparagus was growing up,of which the exponential regression formula was Y=80.148×0.957X,r=0.8489.The flatted test showed that the pycnidiospores could not germinate in thiophanate methy1 with the concentration of 1.4g/l,of which to germinating rate the regression was Y=-9.7137+2.6931X,r=0.9749.The girdle width of P.asparagi was 7.3～6.3mm,when it grew in the medium with 1.4～0.23 g/l thiophanate methy1 for 3 days,on which the mycelium cultured for 7 days didn’t grow.