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Nursery & Forest
Volume 58 Number 7 Date 06/13/2013 BOTRYTIS - Botrytis, or gray mold, was observed by nursery inspectors on begonia, bell flower, geranium, New Guinea impatiens, peony and salvia in Jefferson, Milwaukee, Rock and Washington counties. This very common disease of greenhouse floral crops is characterized by chlorotic lower leaves or distinct brown leaf lesions that develop a grayish brown mass of fungal spores. Symptoms can develop at any stage and may affect any plant part. Measures that increase air circulation should minimize its occurrence. SEPTORIA LEAF SPOT - Dogwood and spirea shrubs in Jefferson and Washington counties were showing symptoms of this common fungal disease, including small, dark purple lesions that first appear on the lower leaves and stems and later enlarge and spread to the upper leaves. Control consists of spacing plants to increase airflow. INVASIVE SPECIES RULE - Nursery inspectors report that the invasive plants, Ampelopsis brevipedunculata 'Elegans' (variegated porcelain berry), Elaeagnus angustifolia (Russian olive) and Hesperis matronalis (dame's rocket) were being offered for sale at nurseries and garden centers in Milwaukee, Outagamie and Washington counties. Under the Chapter NR 40 Wisconsin Invasive Species Rule, it is illegal to transport, import, transfer, sell or introduce any species included in the rule's prohibited or restricted categories. It is important for nursery operators and brokers to become familiar with these species since some may be available from out-of-state sources. Refer to the following website for a list of Chapter NR 40 invasive species: http://dnr.wi.gov/topic/invasives/classification.html. -- Liz Meils, DATCP Nursery Inspector 
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