Shasta Daisy Vascular Wilt Incited byAcremonium Strictum

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Abstract
A new vascular wilt of the Shasta daisy (C. maximum) in California [USA] was investigated. Symptoms included vascular browning, wilting, stunting and unilateral chlorosis and necrosis of the lower leaves. A. strictum was isolated consistently from the stems, roots and occasionally petioles of diseased plants. Although rarely seen, hyphae and conidia were found in yellowed xylem vessels of diseased plants. Disease symptoms were reproduced in the greenhouse and the field, although these were not as severe as in naturally infected field stock. Symptom expression in the field was cyclic and correlated with the recovery of A. strictum from affected plants. The host had to be stressed by excessive soil moisture or by the onset of flowering to obtain symptoms comparable to those of field plants. The host range of A. strictum included monocotyledonous and dicotyledonous agricultural plants as well as several species of weeds.

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