Antiphytovirale Wirkungen von 1,5‐Diacetyl‐2,4‐dioxohexahydro‐1,3,5‐triazin (DA‐DHT)*

Abstract

Abstract Antiphytoviral activities of 1,5‐diacetyl‐2,4‐dioxohexahydro‐1,3,5‐triazine Substitution of 2,4‐dioxohexahydro‐1,3,5‐triazine (DHT) by two acetyl groups resulted in an antiphytoviral compound, 1,5‐diacetyl‐2,4‐dioxohexahydro‐1,3,5‐triazine (DA‐DHT), which inhibits PVX, PVY, ToMV, TMV and TRV better than DHT, but only after, application at relatively high concentrations (10−2 mol/1). The antiphytoviral activity of DA‐DHT is enhanced by combined treatments with DHT as well as with cyanoguanidine, sodiumalkanemonosulfonate and 2‐anilino‐5‐adamantyl‐1,3,4‐thiadiazole., DA‐DHT reduced the number of symptoms of PLRV bearing potato eye cutting plants to a higher percentage than DHT. But the highest reduction was brought about by combined treatments with DA‐DHT, cyanoguanidine, sodiumalkanemonosulfonate and 2‐anilino‐5‐adamantyl‐1,3,5‐thiadiazole. Moreover, treatments with DA‐DHT increased more than treatments with DHT the mass of potato tubers produced by potato eye cutting plants. Combined treatments with DA‐DHT and the above mentioned substances reduced the natural infection with PLRV of a completely healthy potato stock for about 70 % and that of PVY for about 40 %. Thus, the DA‐DHT containing preparations may be capable of keeping potatoes in a good state of health even in regions with a high infection pressure.