Preliminary Studies On Control Effect On Tomato Leaf Mould And Induced Resistance By Ls-1

The paper measured the toxicity of LS-1 to Fulvia fulva (Cookee ) Ciferri, and studied control effect of LS-1 on Tomato leaf mould in fields, and preliminarily studied induced resistance of tomato by LS-1, also screened adjuvants of LS-1, and studied the appropriate applying time of LS-1 and control effect of applying LS-1 mixted with adjuvants on Tomato leaf mould based on the experiment of screening adjuvant. The results were summarized as follows: The field control experiment showed that control effect of LS-1(20.00g/L) on Tomato leaf mould was 62.46%, and which was significantly better than the chemical fungicide (thiophanate-methyl),botanic fungicide(Yinguo) and Bio-fungicide(Junkeduke). Studies on induced resistance by LS-1 showed that PAL activity,POD activity and PPO activity in tomato leaves induced by LS-1 reached peaks in 7d at the same time, and significantly higher than Non-treatment. The results above indicated that LS-1 could induce activity of defensive enzyme in Tomato leaves , so as to amplify the capacity of tomatos' resistance to Fulvia fulva (Cookee ) Ciferri.Especially, PAL activity in tomato leaves induced by LS-1 reached peak 3d ahead than inoculation only,so as to reach the purpose of precaution effect on Tomato leaf mould. The experiment of screenring singular adjuvant showed that control effect LS-1(20.00g/L)+Y203(1.00g/L) on Tomato leaf mould was 77.89%, and control effect of LS-1(20.00g/L)+F302(0.50g/L) on Tomato leaf mould was 71.58%. The mixture rate of LS-1 mixed with two kinds of adjuvants based on screening singular adjuvant was LS-1:Y203:F302=200:30:3, and its control effect on Tomato leaf mould was 79.36%. The appropriate time of applying LS-1 mixed with adjuvants was between 7d before fungus invading tomato and 7d after fungus invading tomato, control effect in this period was from 54.09% to 86.90%,and the time internal was 5d~7d. In the experiment of control effect on Tomato leaf mould indoors, control effect of LS-1(40.00g/L)and LS-1(20.00g/L) were 89.80% 86.35%,which significantly were higer than the chemical fungicide (thiophanate-methyl),botanic fungicide(Yinguo) and Bio-fungicide (Junkeduke). Graduate:Zu YingzhiMajor:plant pathologySupervisor:Prof. Wen Jingzhi...