Most Common Raspberry Plant Pests:
Identification and Treatment Guide

Raspberries are a popular fruit that can be enjoyed fresh, baked into desserts, or used to make jams and jellies. However, like any other plant, raspberries are susceptible to pests that can damage the plants and reduce fruit production. In this article, we will discuss the most common raspberry plant pests, how to identify them, and the best treatment options.

Spider Mites

Spider mites are tiny pests that belong to the arachnid family. They are not true insects but can cause significant damage to raspberry plants. These pests feed on the sap of the leaves, causing yellowing and stippling. In severe infestations, the leaves may dry up and fall off.

To identify spider mites, look for fine webbing on the undersides of leaves and the presence of tiny specks that move when disturbed. You may also notice a general decline in plant health and vigor.

To treat spider mite infestations, begin by spraying a strong stream of water on the undersides of leaves to dislodge and kill the mites. Introducing natural predators like ladybugs and lacewings can also help control the population. If chemical treatment is necessary, use insecticidal soap or neem oil following the manufacturer’s instructions.

Raspberry Crown Borers

Raspberry crown borers are insects that attack the base of raspberry canes. They lay their eggs near the crown of the plant, and the larvae bore into the cane, causing wilting and dieback. Infested canes may have sawdust-like frass at the entry hole.

To control raspberry crown borers, prune and destroy infested canes during the winter months when the larvae are dormant. Avoid planting new raspberries near old infested plants as the borers can continue their life cycle.

Japanese Beetles

Japanese beetles are metallic green beetles with copper-colored wings. They are a common pest in many gardens and can cause significant damage to raspberry plants. Adult beetles feed on the foliage, leaving skeletonized leaves behind. The larvae, known as white grubs, feed on the roots of grasses and can damage the raspberry plant’s root system.

To control Japanese beetles, handpick the adults from the plants early in the morning when they are less active. You can also use pheromone traps to attract and capture them. Applying insecticides labeled for Japanese beetle control may be necessary in severe infestations.

Raspberry Fruitworms

Raspberry fruitworms are small, cream-colored worms that feed on developing raspberry fruits. The adult fruitworm is a small brown or black beetle that lays eggs on the flowers or young fruit. The larvae tunnel into the fruit, causing it to turn brown and become mushy.

To control raspberry fruitworms, inspect the plants regularly for signs of infestation. Handpick any damaged fruits and destroy them. Applying insecticides labeled for fruitworm control during bloom and fruit development stages can also be effective.

Aphids

Aphids are small insects that suck sap from raspberry plants, causing stunted growth and distorted leaves. They reproduce rapidly, and a single aphid can produce dozens of offspring in a short period.

To identify aphids, look for clusters of tiny insects on the undersides of leaves or curled leaves caused by their feeding.

To control aphids, you can use a strong stream of water to dislodge them from the plant. Introducing natural predators like ladybugs and parasitic wasps can help keep aphid populations in check. In severe infestations, insecticidal soap or neem oil can be applied.

Raspberry Sawflies

Raspberry sawflies are small caterpillar-like larvae that feed on raspberry foliage. They have a green or yellow color and are often mistaken for caterpillars. Sawfly larvae can skeletonize leaves, causing significant damage to the plant.

To control raspberry sawflies, handpick the larvae from the plants and destroy them. Applying Bacillus thuringiensis (BT) spray, a natural bacterial insecticide, can also be effective in controlling sawfly infestations.

Conclusion

Identifying and treating common raspberry plant pests is essential for maintaining healthy plants and maximizing fruit production. Regular inspection and early intervention are crucial in preventing pest infestations from spreading and causing irreversible damage. Remember to use integrated pest management techniques and consider organic options before resorting to chemical treatments. By staying vigilant and taking appropriate action, you can enjoy a bountiful harvest of delicious raspberries year after year.