Michigan State University Extension
Ornamental Plants plus Version 3.0 - 00001427
11/12/99
TAGETES INSECT PROBLEMS
Tarnished plant bug causes distorted flowers and leaves
when it injects a poison as it feeds.
Leafhopper causes cupping and in-rolling of leaf margins.
The petioles are twisted and the undersides of infected
leaves turn purplish as they are exposed to the sun. The
branch tips and leaflets wilt and the leaflets turn yellow
and dry. New shoots develop below the point of attack.
Dwarf varieties are more severely infested than taller
types. The repeated killing of the branch tips delays
flowering.
Greenhouse leaf tier webs the leaves or flower buds
together. The insect feeds on the undersides of the
leaves.
Slugs may be detected by the silvery slime trails they
leave. Slugs can be controlled with slug baits used
according to label directions.
Mites are the most frequent pest on marigolds especially
during hot weather. The leaves (Vis. 1) lose their green
color and severe infestations cover the plant with fine
webbing.
Related information.
Pesticide Recommendations
Leafhoppers
Spider Mites
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This file was generated from data base ZZ on 01/19/00.
Data base ZZ was last revised on 11/12/99.
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