Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00000362
11/12/99

CHRYSANTHEMUM INSECT PROBLEMS-OUTDOORS


Aphids suck plant juices and are controlled with
applications of dust or sprays.

Rose chafers feed on the mums and are most common where
soils are sandy. These are light tan with red spindly
legs. Pesticides generally do a poor job of controlling
rose chafer due to the large numbers of insects present at
one time.

Stalk borer bores in the stem of chrysanthemum at
flowering time.

Four-lined plant bug causes sunken, round, brown spots on
the leaves.

Chrysanthemum leaf miner makes irregular tunnels in the
leaves near the margins.

Chrysanthemum lace bug sucks plant juices giving the
leaves a bleached out appearance.

Mites cause the leaves to lose their good green color. If
the infestation is heavy, fine webbing may be seen at the
branch tips.

The foliar nematode causes yellowish brown spotting of
the leaves. The spots are more or less bounded by larger
veins. The spots enlarge and run together so the entire
leaf is involved. The leaves die, become brittle and
fall. The brown areas in the leaf are usually wedge
shaped. Where the pest is a problem, propagate plants
from cuttings taken from tall shoots and not by division.
Do not replant the cuttings in the same area. The bed
should be mulched when the soil has warmed.

Related information.
Pesticide Recommendations
Aphids on Ornamentals
Spider Mites


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