Abstract

The use of weather-vane spore traps with vaseline coated slides is an effective means of timing initial fungicide applications for potato early blight control in Colorado. This technique is simple and more reliable than some methods currently being used. Effective control of early blight was achieved with fewer sprays by using this system rather than plant growth stage as the basis for initiating fungicide applications. The method promises to be most useful in areas where crops with diseases caused by fungi that produce spores similar to those ofA. solani are not grown in close association with potatoes.

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