Common Disease Problems
Botrytis Fruit Rot: Flattened, black masses of fungus appear on canes. Open flowers can become infected which in turn infect the berries. Berries become mummified. Burpee Recommends: Prune to improve air circulation. Allow fruit to ripen in an open canopy by pruning accordingly. Remove mummified fruit as the disease overwinters in the berries.
Crown Gall: Rough, wart-like growths or galls appear on the crown at or just below the soil surface. These can also form on the stems or canes of blackberries. Plants can become stunted, subject to drought stress and wind damage. Large enough galls may cause girdling which results in plant death. Burpee Recommends: Examine the canes prior to planting for any indication of galls. Avoid injury of the plant. You can remove the gall if it is small enough by cutting around it into healthy wood allowing that area to dry out, cutting into healthy tissue as little as possible. If plant is severely infected, remove it.
Orange Rust: This fungus causes plants to become stunted and weak with poor fruit production. Shortly after new growth appears in spring new shoots are weak and spindly, leaves are pale green to yellow. In a few weeks lower leaf surfaces are covered in bright orange powdery spores. Affected leaves wither and die by early summer. The disease is systemic, and remains throughout the plant so just removing infected leaves will not improve the health of the plant. Burpee Recommends: Dig up and remove infected plants and destroy nearby wild brambles. Remove plants before the spores are discharged if possible.
Phytophthora Root Rot: This soil borne disease thrives in poorly drained soils and can live in the soil for years. Above ground symptoms include pale or reddish leaves, small leaves, defoliation, branch die back, stunting and death. Burpee Recommends: Remove infected plants.
Raspberry Leaf Spot: This causes small spots to appear on the young foliage. As the spots grow the tissue may fall out leaving holes in the leaves. Eventually the leaves will drop and weaken the plant. The disease is worse when it occurs on the primocanes as the fruiting canes will die back after producing fruit anyway. Burpee Recommends: Remove affected plant debris. Provide good air circulation through pruning and removing canes that have fruited.
Common Pest and Cultural Problems
Aphids: Greenish, red, black or peach colored sucking insects can spread disease as they feed on the undersides of leaves. They leave a sticky residue on foliage that attracts ants. Burpee Recommends: Introduce or attract natural predators into your garden such as lady beetles and wasps who feed on aphids. You can also wash them off with a strong spray, or use an insecticidal soap.
Discolored Foliage: Brown foliage can result from drought stress, particularly in mid-summer. Burpee Recommends: Water regularly and use mulch to conserve water and control weeds.
Raspberry Cane Maggot: Larvae are white and legless and turn into small flies as adults. A plant affected by the maggot wilt and become discolored. Swelling in stems may occur. Burpee Recommends: Prune and destroy infested canes. Keep plants well watered to improve plant vigor.
Raspberry Crown Borer: Larvae have white bodies with brown heads. Adults are clear-winged moths with yellow and black banding. When attacked by the borer, plants will lack vigor and will be stunted. Wilting occurs in lateral cane growth. You can cut open the stems and see the tunnels the borers make. Burpee Recommends: Prune and destroy infected canes to prevent spreading. Ensure plant is not under stress as pests are attracted to plants that are weak.
Root Weevils: Adults are flightless, dull brown or gray. Adults feed on the foliage while the larvae feed on roots destroying root hairs and chewing their way through the bark and cortex of larger roots. They can tunnel through to the crown. Burpee Recommends: Check roots for larvae prior to planting. Contact your Cooperative Extension Service for control assistance.
Do I need two different varieties to get fruit? No, raspberries are self-fruitful.
Will I get fruit this year? No. Expect fruit one year after planting and 3-5 years after planting for full fruit.
Are there any raspberries for zone 10? Sorry, raspberries grow best in cool climates and are not recommended in zones warmer than 8.
Can I grow raspberries in containers? Raspberries are rangy plants on the large side, usually 4-8 feet in height and are challenging to grow in containers.
How far from blackberries, black raspberries and wild brambles should I plant my red raspberries? Plant at least 100 feet apart to avoid disease issues.