Disease spread is most rapid in dense overcrowded plantings and in plantings weakened by drought, winter injury or attacks by insects. Use of a damp, heavy mulch which provides excessive moisture also encourages disease development.
Rogue and destroy all severely diseased plants. Thin thick plantings to increase light and air circulation. Remaining plants may be protected with a fungicide such as chlorothalonil (Bravo, Daconil 2787) or mancozeb Dithane, Penncozeb). Spray the plants two or three times at 10 to 14 day intervals. If volutella blight has been a problem in the past, it may be necessary to protect plants with two or three fungicide applications beginning when new growth starts each year.
Avoid heavy, thick mulches of materials, such as leaves or compost which hold moisture and favor the establishment of the disease.
Since the disease spreads rapidly in stands that have been weakened by insects, make an attempt to control them. Scale insects, particularly euonymus scale, can be very destructive. For control of scale, prune badly infested plants. Spray with an insecticide such as malathion, carbaryl (Sevin) or acephate (Orthene) during the first week of June and repeat in early July.
A horticultural oil can be applied in mid-April to early May. If coverage is good, excellent control can be achieved.
The information in this material is for educational purposes. The recommendations contained are based on the best available knowledge at the time of printing. Any reference to commercial products, trade or brand names is for information only, and no endorsement or approval is intended. The Cooperative Extension system does not guarantee or warrant the standard of any product referenced or imply approval of the product to the exclusion of others which also may be available.All agrochemicals/pesticides listed are registered for suggested uses in accordance with federal and Connecticut state laws and regulations as of the date of printing. If the information does not agree with current labeling, follow the label instructions. The label is the law.Warning! Agrochemicals/pesticides are dangerous. Read and follow all instructions and safety precautions on labels. Carefully handle and store agrochemicals/pesticides in originally labeled containers immediately in a safe manner and place. Contact the Connecticut Department of Environmental Protection for current regulations.The user of this information assumes all risks for personal injury or property damage.Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Kirklyn M. Kerr, Director, Cooperative Extension System, The University of Connecticut, Storrs. The Connecticut Cooperative Extension System offers its programs to persons regardless of race, color, national origin, sex, age or disability and is an equal opportunity employer.