Plant Disease (1998) 82, p. 264 (Sanderlin)

R.S. Sanderlin (1998)
Evidence that Xylella fastidiosa is associated with pecan fungal leaf scorch
Plant Disease 82 (2), 264-264
Abstract: A specific type of leaf scorch of pecan (Carya illinoinensis) was examined. This type is characterized by necrosis beginning at the tips or margins of the leaflets and progressing toward the midrib and base of the leaflets. The most distinguishing feature is a dark brown, black, or purplish band of tissue at the interface of the necrotic and green leaflet tissue. This band does not occur on all affected leaflets, but is a consistent feature with this symptomatology. Leaflets with this leaf scorch usually abscise before the entire leaflet becomes necrotic. The disease has beem named fungal leaf scorch because of the association with fungi and the observation that some fungicides reduced the severity of leaf scorch. Genera of fungi implicated in the development of this disease were Pestalotia, Epicoccum, Curvularia, and Fusarium. Diseased plants were tested for the bacterium Xylella fastidiosa using a commercial enzyme-linked immunosorbent assay. Positive reaction for the presence of X. fastidiosa in rachises was recorded from 10 of 10 trees but not from symptomless trees.
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Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Xylella fastidiosa	Pecan/hickory (Carya)