Aphids suck juices but are controlled by malathion, Diazinon dust, Sevin, or rotenone. Black blister beetle feeds on flowers and foliage in the middle of June. Sprays of Sevin should control the pest. Tarnished plant bug punctures the terminal shoot below the flowers and injects a poison causing the flower to die. Tarnished plant bug may be controlled with sprays of Sevin, or malathion.
Mites cause the plants to lose their good green color and appear stippled.
Heavy infestations develop noticeable amounts of very fine webbing. Mites are controlled with applications of Diazinon dust. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension.