Most Common Black Raspberry Plant Pests:
Identification and Treatment Guide

Black raspberries are a delicious and nutritious fruit that many gardeners enjoy cultivating. However, like any plant, black raspberry bushes are susceptible to a variety of pests that can damage the plants and reduce fruit production. In this guide, we will discuss some of the most common pests that affect black raspberry plants, how to identify them, and the best treatments to keep your plants healthy and thriving.

Japanese Beetles

Identification: Japanese beetles are metallic green with copper-brown wings and are about half an inch long. They skeletonize leaves by eating the tissue between the veins, leaving only the veins intact.

Treatment:
– Handpick the beetles off the plants early in the morning when they are less active.
– Use neem oil or insecticidal soap to control Japanese beetles.
– Apply a layer of floating row covers over plants to prevent beetles from landing on them.

Raspberry Crown Borer

Identification: Raspberry crown borers are small, whitish larvae with brown heads that bore into the canes near ground level. Infested canes may wilt and die.

Treatment:
– Prune out and destroy infested canes.
– Apply beneficial nematodes around the base of plants to target larvae in the soil.
– Wrap a thick layer of aluminum foil around the base of plants to deter adult moths from laying eggs.

Spider Mites

Identification: Spider mites are tiny arachnids that suck sap from plant tissues, causing leaves to become stippled or bronzed.

Treatment:
– Spray plants with a strong blast of water to dislodge spider mites.
– Apply insecticidal soap or neem oil to control spider mite populations.
– Introduce predatory mites or ladybugs to feed on spider mites.

Anthracnose

Identification: Anthracnose is a fungal disease that causes dark sunken lesions on canes, leaves, and fruits. Infected tissues may also develop a pinkish spore mass in humid conditions.

Treatment:
– Prune out infected canes and dispose of them properly.
– Apply fungicides containing copper or sulfur to protect plants from anthracnose.
– Improve air circulation around plants by spacing them properly and pruning for better airflow.

Raspberry Fruitworm

Identification: Raspberry fruitworm larvae are small yellowish-white caterpillars with brown heads that feed on developing berries, often leaving behind frass inside fruits.

Treatment:
– Handpick infested berries and destroy them.
– Apply Bacillus thuringiensis (Bt) spray to target fruitworm larvae.
– Use row covers to protect berries from adult fruitworm moths.

Raspberry Sawfly

Identification: Raspberry sawfly larvae are green caterpillars with black spots that skeletonize leaves by feeding on the leaf tissue between veins.

Treatment:
– Handpick sawfly larvae off plants and drop them into soapy water.
– Prune out heavily infested branches to reduce sawfly populations.
– Apply insecticidal soap or neem oil to control sawfly larvae.

Cane Borers

Identification: Cane borers are slender, cream-colored larvae that tunnel into raspberry canes, causing wilting and dieback of affected canes.

Treatment:
– Cut out and destroy canes with borer entry holes.
– Seal pruning wounds with a tree wound sealer to prevent cane borers from entering.
– Keep plants healthy and well-watered to reduce stress on raspberries, making them less susceptible to cane borers.

By being vigilant about monitoring your black raspberry plants for signs of pest infestations and taking proactive measures to control these pests, you can ensure a healthy harvest of delicious berries year after year. Remember to always follow label instructions when using any pesticides or treatments on your plants to protect yourself, your garden, and the environment. Happy gardening!