Quantitative vertical resistance is confusing because its inheritance is qualitative while its effects are quantitative. It can easily be confused with horizontal resistance, and the best way to avoid it in a breeding program is by choosing only parents that exhibit the normal, qualitative, vertical resistance. Fortunately, quantitative vertical resistance is rare, and occurs mainly in the small grain cereals, such as wheat and barley. Vertical resistance to wheat Hessian fly (Mayetiola destructor), and rice blast, are examples.
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