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Soil Testing
and Plant Diagnostic Services
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Plant Diagnostic Clinic
573-882-3019
Discolored or rough areas in the bark may be seen on dead twigs or branches. Lombardy poplars may die from basal cankers. Prune out affected areas well below the diseased area.
Brown, circular spots with a dark-brown margin. Premature defoliation may result. The fungus also causes a twig blight, resulting in dieback. Rake and remove fallen leaves. Use Bordeaux, other copper-containing fungicides, chlorothalonil or maneb. May be applied in early spring as new leaves are emerging.
Mycosphaerella (Septoria) leaf spot and on poplar
Leaf spot appears as sunken, black flecks that coalesce to form large and
irregular blotches. Cankers (sunken and discolored areas of bark) may girdle stems,
resulting in dieback. The most effective means of control is to plant clones with
resistance. Use thiophanate-methyl or chlorothalonil for leaf spots if necessary.
Note
Check with local nurseryman or catalogs for information about resistant
clones.
Updated 10/9/07
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