The buildup of sooty mold fungus on the honeydew that is deposited on the upper surfaces of the foliage of pecan, Carya illinoensis (Wang) K. Koch, as a result of feeding by Monellia costalis (Fitch) and Monelliopsis nigropunctata (Granovsky) was measured throughout the growing season. The percentage reduction in light transmission by sooty mold was as high as 25%. Therefore, sooty mold could have a serious effect on pecan production.
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Tedders et al. (1976) studied this question.