AbstractThe synthetic putrescine analogues (E)‐N,N,N′,N′‐tetraethyl‐l,4‐diaminobut‐2‐ene(E‐TED), the (Z)‐isomer (Z‐TED) and (E)‐N,N‐dimethyl‐1,4‐diaminobut‐2‐ene(E‐DMD) were prepared as their salts, and controlled five important crop pathogens (Erysiphe graminisDC f.sp.hordeiMarchal,Uromyces viciae‐fabae(Pers.) Schroet,Botrytis fabaeSardina,Podosphaera leucotricha(Ell.&Ev.) Salm. andPhytophthora infestans(Mont.) De Bary). E‐TED was also effectivein vitro, with growth ofP. infestans and Pyrenophora avenaeIto&Kuribay completely inhibited at 1800 and 360 mg litre−1respectively. WhenP. avencewas grown in the presence of 180 mg E‐TED litre−1, there were significant reducuons in putrescine and spermidine concentrations (58% and 35% respectively). An apparent increase in ornithine decarboxylase activity and a decrease inS‐adenosylmethionine decarboxylase activity inP. avenaeexposed to E‐TED at 36 mg litre−1were not statistically significant. Diamine oxidase activity r
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