N. Havis, D. Walters, W. Martin
May 1, 1994
Citations
0
Influential Citations
22
Citations
Journal
Pesticide Science
Abstract
The 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 graminis DC f.sp. hordei Marchal, Uromyces viciae-fabae (Pers.) Schroet, Botrytis fabae Sardina, Podosphaera leucotricha (Ell. & Ev.) Salm. and Phytophthora infestans (Mont.) De Bary). E-TED was also effective in vitro, with growth of P. infestans and Pyrenophora avenae Ito & Kuribay completely inhibited at 1800 and 360 mg litre−1 respectively. When P. avence was 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 in S-adenosylmethionine decarboxylase activity in P. avenae exposed to E-TED at 36 mg litre−1 were not statistically significant. Diamine oxidase activity remained unchanged in fungal tissue exposed to E-TED.