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Cooperative research on walnut blight between UC Riverside and the UC Davis breeding program has led to several ways to evaluate new genotypes for blight resistance. The standard way is using natural incidence of walnut blight on trees that are old enough to have developed enough fruit that can be evaluated. This takes four to five years. Another method is to inoculate fruit, allowing susceptibility data to be collected regardless of rainfall events. Still, we have to use fruit for this assay...
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5/8/2020

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