Erysiphe graminis fungicides

The tetracyclic [l,2,4]triazino[4,3-/]phenanthridines 162 showed fungicidal activity, where they appeared to be the key requirements for control of Erysiphe graminis tritici (90MI3). 

The active substance FDN (10), N,N-dimethyl-N -(3-chlorophenyl)-guanidine, is a protective and eradicant fungicide of almost the same activity as dinocap against the powdery mildew of cucumber. It is a soil fungicide, the active substance being absorbed by the roots of the plant. It also has a satisfactory effect against Erysiphe graminis (Melnikov et al., 1974). Its acute oral lDj is 420 mg/kg for rats. 

The main application of BTH is to control powdery mildew in wheat and barley. BTH is an important defense response inducer, but it did not affect the pathogen metabolism like fungicides. In order to determine whether BTH played a role in SAR, a susceptible wheat cultivar was infected with Erysiphe graminis f. sp. triticL, then sprayed with BTH ten days after inoculation. A hypersensitive response was successfully initiated. This was a clear... 

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