Chlorothalonil (2,4,5,6-tetrachloroisophthalonitrile) waa unug dabiici ah oo inta badan loo isticmaalo qaab ballaaran, fungicide aan nidaamsaneyn, oo leh isticmaalka kale sida ilaalinta alwaax, sunta cayayaanka, acaricide, iyo si loo xakameeyo caaryada, caarada, bakteeriyada, algae. Waa fangaska difaacaya, waxayna weerartaa habdhiska neerfaha cayayaanka iyo caarada, taasoo keenta curyaan saacado gudahood. Curyaannimada lama beddeli karo.