Insect on Bean Plants

Asked May 8, 2016, 11:59 AM EDT

Good morning! I am new to Maryland, and just planted a row of bean plants. I planted them three weeks ago, direct sow. It is heavy clay soil, and I have about 4 inches of miracle grow soil on top. They are planted in full sun, but it's a windy area. I know that the plants may not do well this year because of the soil, and next year, I am hoping to construct a raised bed with imported soil for better planting. The beans sprouted about two weeks ago, and each have two true leaves. It has been raining for the past two weeks (as I am sure you know) and today, they are covered in small red insects. There are of small red insects on the top of the leave and not the bottoms. At first I thought that they were spider mites, but under a magnifying glass, the bodies are brown and only the heads are red. I have attached a photo and would be happy to provide more. What type of insect are these? How do I get rid of them? Thank you so much for your help!

Anne Arundel County Maryland

1 Response

The insects on your bean plants look like spider mites.
Since you have a serious infestation we recommend that you discard the plants and start over. Beans are a warm season crop and will not be productive until the soils are warmer. They will just sit there in cold wet soils. Wait until all danger of frost is past and soils warm up before you replant. For a continuous harvest, you can plant snap beans every 2 to 3 weeks from the frost-free date through mid- to late July. See our vegetable profile on beans