Greenhouse evaluation of chemicals for control of powdery mildews. V. Tests with unsaturated compounds*

Abstract

SUMMARY Compounds containing one or more unsaturated links in the molecule have been tested for toxicity to the powdery mildews of apple and barley. Some of these compounds are known to be highly toxic to spores of other well‐known fungal pathogens, but none was effective against these powdery mildews. It would appear that unsaturation, even in molecular structures leading to high fungitoxicity to many fungal species, is not of great value in producing compounds toxic to powdery mildews, at least to those of apple and barley.