Fungicides derivatives n- (3-nitrophenyl) -N'-phenyl-, n- (2-chloropyridin-4-yl) -N'-phenyl-and n- (1,2,3-thiadiazol-5 -yl) -N'-phenyl-fluorinated ureas for use in horticultural crops and ornamental plants.

摘要

Fungicides of N - (3-nitrophenyl) - N '-phenyl-N - (2-chloropyridin-4-yl) - N'-phenyl-N and - (1,2,3-thiadiazol-5 -yl) - N '-phenyl-ureas for use in horticultural fluorinated and ornamentals crops.; A method for protecting plants against diseases caused by phytopathogenic fungi is described, which consists in applying to the plant and / or crop area a fungicidally effective amount of a N - (3-nitrophenyl) - N - (2- chloropyridin-4-yl) -, or N - (1,2,3-thiadiazol-5-yl) - N '-fluorofenilureas of formulas (I), (II) and (III) respectively, wherein R { 1}, {2} R, R {3}, {4} R and R {5} are hydrogen atoms or fluorine in all possible combinations. Particularly notable is the fungicidal activity of some of these ureas against two major soil fungi involved in the complex syndrome called `collapse '' wilt disease and death of plants Melon, Monosporascus cannoballus and acremonium cucurbitacearum, whose growth inhibit 100% in vitro at concentrations of only 1 ppm.; 1