Thrips cause the leaves to turn reddish. The leaf surface becomes rough from the deposition of small black flecks. Use a house plant insect spray according to the label directions.
Cyclamen mite prevents young plants from forming normal flower buds. The flowers are distorted and fall prematurely and the blooming period is shortened. Infested leaves are deformed, curl from the outside, and become wrinkled into pockets and depressions. Use a house plant insect spray according to label directions.
Aphids suck plant juices and are usually found at the stem tips. A heavy infestation will coat the leaves with sticky honeydew. A black, sooty mold can grow on the honeydew. The insects can be green, white, pink or black.