Cranberry Pest Management
First of all, it’s important to clear up which kind of cranberries we’re talking about. This article is about cranberry vines (Vaccinium macrocarpon), which are often confused with cranberry bush (Viburnum trilobum). With that in mind, here are some of the most common bugs that eat cranberries and their methods of control: Cranberry Tipworm – Maggots feed on leaves, creating a cupping effect. Apply insecticide during the growing season’s first hatch period, usually in mid to late spring. Cranberry Fruitworm – Larvae eat fruit from inside out, leaving an entrance hole covered with webbing. Spray with insecticide or hand pick and dispose of fruitworms. False Armyworm – Larvae eat new growth, blossoms, and fruit. Late season flooding is good for control. Black-headed Fireworm – These pests link leaves and vine tips together with webbing and cause browning in uprights. Spring flooding and insecticide can be used for control. Cranberry Weevil – Larvae hollow out flower buds before opening. Some chemical control is effective, but weevils are continually building up resistance to it. Cranberry Flea Beetle – Also called the red-headed flea beetle, adults skeletonize leaves during high summer. Like many flea beetles, they can be managed with certain insecticides. Spanworm – Green, brown, and big cranberry spanworms are all active pests of cranberries. The larvae feed on leaves, blossoms, hooks, and pods. Most insecticides are effective. Cranberry Girdler – Larvae feed on roots, runners, and stems, turning foliage brown in late summer. Best treated with insecticides in late summer to early autumn. While rarely a problem, aphids will occasionally feast on cranberry plants and their honeydew can attract ants as well. By eliminating the aphids, you’ll take care of any ant problems.
