These berries are attractive not only for people, but also for insects. But not only pests cause damage to raspberry bushes - no less damage from diseases, and it is much more difficult to get rid of them.
The most common diseases are gray rot, didimella, septoz, ulcer spot, and yellow mesh. Of insects, the most dangerous raspberry beetle.
Common raspberry diseases and their treatment methods
Didimella, or purple raspberry blotch
The causative agent is a mushroom Didymella applanata. Young shoots appear small purple spots that grow and ring the shoot. By the fall, the spots dry up and crack, the wood of the stems becomes brittle, because of which they break easily.
Affected shoots overwinter poorly, bear fruit poorly and in most cases dry out in the second year already at the beginning of the growing season.
Control measures. Use healthy planting material, discard diseased shoots. To effectively combat this disease, spray the raspberry bushes with a Bordeaux mixture as you grow shoots, before flowering and after harvesting.
The causative agent is a mushroom Botrytis cinerea. In the years with an abundance of precipitation, large, brown, drying out spots appear on the leaves. Fluffy smoky-gray sporulation develops, spores infect inflorescences, berries and shoots, which are covered with gray bloom. On the stems appear watery brown spots that crack in winter, and the stems die off.
Control measures. If you are faced with a raspberry disease according to a gray rot-like description, pick up the affected berries and spray the bushes with Skor.
Ulcer stains of stems
The causative agent is a mushroom Coniothyrium wernsdorffiae. On young shoots appear brown, slightly dented spots. Over time, the spots grow and brighten, the bark dries out, cracks, under it opens a longitudinal ulcer with raised edges. The affected shoots dry out quickly.
Control measures. Discard diseased shoots, prune the sprouting stalks immediately after harvest. For the treatment of raspberries from this disease, spray the plants with Bordeaux mixture or its substitutes when the shoots grow, before flowering and after harvesting.
Septoria, or white spotting
The causative agent is a mushroom Septoria rubi. The spots on the leaves are numerous, small, brown, which gradually brighten, but the brown border remains.
As can be seen in the photographs, raspberry leaves affected by this disease dry out prematurely:
Often, young shoots are also affected, on which blurred spots appear around the kidneys.
Control measures. Collect the plant residues, spray the bushes in the spring, before the leaves grow back and after the flowering of the Bordeaux mixture.
The causative agent is a virus Raspberry-Yellownet virus. On the leaves along the small veins, reticular chlorosis is manifested as individual spots. Around the main veins fanlikely expand the yellow-green areas. Plants are stunted and poorly fruited. The virus is transmitted by raspberry sprout aphids.
Control measures. Discard and burn diseased plants. To treat this raspberry disease, spray with Fufanon, Kemifos or Actellic.
Raspberry pest Byturus tomentosus: photos and control measures
Raspberry beetle (Byturus tomentosus) has a greyish yellow body
Look at the photo - the larvae of this pest raspberry grayish-white with brown plates on the back:
Beetles hibernate in the soil, come to the surface in early May. They feed on the kidneys and the growing leaves of raspberry, skeletonizing them. Females lay eggs one by one in flowers and on green ovaries. After 10 days, the larvae hatch, bite into the receptacle and feed into the fruits and 40 days. Damaged berries quickly rot.
Control measures. For processing raspberries from these pest spray plants in the period of the nomination of buds, i.e. before laying by females of eggs, one of the preparations: “Fufanon”, “Aktellik” or “Iskra”.