![]() ![]() Remove the infected tree and do not replace it with a woody ornamental until the soil has been fumigated and aerated thoroughly. The bark over the canker becomes sunken, and reddish-brown sap oozes out. Reddish-brown cankers develop in the inner bark of the main trunk and branches. Promote plant vigor by protecting the tree from stresses. Leafhoppers and spittle bugs carry the bacteria from tree to tree. The light-brown area is separated from green tissue by a dark reddish-brown band and a narrow but distinct yellow halo. Leaf margins on localized, individual branches brown in mid- to late July. In a nursery situation, apply a fungicidel at bud break and at 7- to 10-day intervals until the weather dries and the daily average temperature is above 65☏. Usually, little damage occurs and no treatment is necessary. Under very wet spring conditions, some defoliation can occur. Small, brown fruiting structures of the fungus are found near the affected leaf veins. Sugar maple: large, irregular, brown or red-brown areas develop along and between the veins similar to injury due to drought and heat stress. If pruning is necessary, prune during the dormant season and avoid pruning in spring when the sap is running. Remove badly-placed or crossing shoots to encourage a lovely branch pattern. If you need to reduce height and width, follow long branches back to a side branch and pruning it out at this point.Norway maple: narrrow, purple to brown streaks occur along the leaf veins. Mid spring or late summer are perfect months to do this.
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