For drought-weary farmers in the West, hot weather and high winds have brought another threat to this year's dwindling crop. Hordes of Russian wheat aphids, which thrive on dry wheat and barley fields, are rampaging through 15 Western states, from California and Arizona to Montana. The tiny stalk suckers (size: 0.1 in.) have nearly wiped out harvests in some fields. The bugs are natives of the Soviet Union, Iran and Afghanistan, but were transplanted to Mexico by unknown means in 1980 and have been moving north ever since. Last year the insects caused $36 million in damage across ten states. Experts...
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