Climatic conditions in Iowa are generally unfavorable to the development of the potato disease known as late blight. It is of rare occurence here but in occasional seasons it causes serious losses.

The climatic conditions under which late blight occurs in Iowa are a high degree of humidity with heavy dews and midsummer temperatures lower than usual. An excess of rainfall and a predominance of cloudy weather are contributing factors.

The practice of shipping in northern grown potatoes for seed is common in Iowa. Such seed is apt to be infected with the late blight fungus.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.