Still other problems are emerging as California's weather patterns grow more erratic.Early fall rains have been a problem for walnuts, spoiling ripening fruits.And heat waves - especially when they follow a rain event - can cause fruit to drop or spoil.Almost 40% of last fall's walnut crop was lost when Central Valley temperatures approached 115 degrees, according to Robert Verloop, executive director of the California Walnut Board and the California Walnut Commission.
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