This study investigates needle droop and needle blight in red pine, highlighting their distinct characteristics.
Recent damage by needle droop in Wisconsin plantations has caused concern for fear it might become widespread, since no satisfactory explanation was available. This paper suggests the cause of the disease, and distinguishes needle droop from needle blight with which it previously has been confused.
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Patton et al. (1954) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: