Study on Application Techniques of Tricyclazole and the Influnce Factorson Its Control Effect against Rice Blast

The techniques of applying tricyclazole aganist rice blast (caused by Pyricularia grisea )and factors decreasing control effects were studied. Notable effects were obtained by foliar spraying and root-soaking with tricyclazole controlling rice blast, and root-soaking was more effective. The high control effect could last as long as 10 days after leaf-spraying or root-soaking of tricyclazole. The second treatment with foliar spraying three days after the first treatment could increase and elongate control effects. The control effect was 81.3% sprayed before Pyricularia grisea invaded, but the control effect was only 35.6% treated after P. grisea invaded. If leaves of rice seedling were damaged, tricyclazole had no any control effect. If it rains 1 h after tricyclazole treatment, control effect may be decreased. While it rains after 3 h, there was not any influence on the control effect of the fungicide.