Blueberry Twig Blight Caused byPhomopsis vaccinii

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Abstract
In North Carolina [USA] P. vaccinii causes a blighting of 1-yr-old blueberry twigs with flower buds, resulting in reduced fruit production. The primary mode of infection was through flower buds from budbreak through bloom. The fungus apparently entered the stem through the vascular tissue and progressed down the stem 50-150 mm. The entire stem was not killed. Systemic invasion also occurred when the fungus infected the leaf margins and progressed down the petiole into the stem. Infection of unwounded succulent stems resulted in small, raised lesions that failed to develop further. Rain-dispersed conidia of P. vaccinii were collected in traps throughout the growing season, the largest number being caught from blossom budbreak through bloom.

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