Abstract
During recent years, in parts of the Northwestern states and western Canada, rust fungi have attacked a considerable portion of the growing grain. Wheat, barley, oats and rye in the maturing stage are hosts for special rusts. Wheat rust (<i>Puccinia graminis</i>) is the most prevalent. Over large sections of the country, given proper conditions of heat and moisture, no single plant stem escapes infection. Immense numbers of spores are developed, so that during the harvest season it is not uncommon to see binders working in the grain fields enveloped in a cloud of rust spores. Harvest workers must inhale great numbers of these fungi. I have seen three patients suffering from asthma, in whom the exciting cause of the attack was a proximity to these rusts. The history of each case is similar: there was a short period of exposure to the infected grain, during which the person was evidently
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