Photographic Diagnosis of Pecan Leaf Disease
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Ever since Texas Governor James Stephen Hogg in 1906 requested that a pecan tree serves as his headstone and that the nuts of the tree be distributed to make Texas a “Land of Trees,” pecans have been a big part of many Texan’s identities. So much so did Texans love pecans that the pecan tree became the official tree of Texas in 1919 in the context of the 36th Texas Legislature. Fusicladium effusum, commonly called pecan scab, is the most economically impactful disease of trees in the south-eastern United States. In 2013, there was an estimated 20-25 million pound loss of pecans due to weather conditions that allowed pecan scab to thrive. The fungus is a problem for pecan growers as it reduces both yield and profit. Our work will aid researchers and farmers in identifying and monitoring pecan scab infections in their orchards by analyzing a photo of a pecan tree leaf taken by the user with a mobile phone. Having this tool will allow farmers to react faster to pecan scab, have a good idea of how much fungicide is appropriate to deal with the level of infection, and compare disease severity over the time the user has sampled the pecan leaves.
Froeschke, Harrison Parker (2018). Photographic Diagnosis of Pecan Leaf Disease. Undergraduate Research Scholars Program. Available electronically from