Soybean rust affects apple growers, too

One would not expect a disease impacting soybean crops to have any direct impact on apples. But, as a sign of how tightly woven farming of all crops are tied together, this article discusses how the product used to protect soybeans from this disease can have a toxic effect on nearby apple trees.

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Additional information from All About Apples
Back in 2000 and 2001 a study was done on a set of apple varieties to determine those that showed a phytotoxic response to the azoxystrobin fungicide. The results can be found here.