Dieback of raspberry shootsis one of the most dangerous diseases affecting raspberry bushes. In order to overcome this disease, it is necessary to take both appropriate agrotechnical measures to prevent excessive moisture and thickening of shrubs, as well as spraying with fungicides. See how to recognizesymptoms of raspberry shoot dieback , how to conductfight diebackand learn about provenecological spraying for raspberry shoot dieback , thanks to which you will avoid the use of chemicals in the garden!
Dieback of raspberry shoots
Dieback of raspberry shoots - symptoms
Raspberry shoot dieback is a fungal diseasethat attacks mostly commercial raspberry plantations, as they are often overly dense, which favors the development of the disease. However, the fight against shoot dieback can also be a real challenge in allotment or home gardens. The disease is mainly caused by Didymella applanata fungus, but Botrytis cinerea (much better known as the cause of gray mold), Leptosphaeria coniothyrium and Phytophthora citricola are also not without fault.
The first symptoms of raspberry shoot diebackusually appear in the period from mid-May to the end of June. During this period, on this year's young shoots,purple-brown spots around the buds and at the base of the petiolesspots develop significantly at the end of the growing seasonlong streaks covering a large part of the shootsDuring the lignification of the stems, the spots turn dark gray and become covered with dark spots constituting the fungus sporulation. In the following yearsthe bark within the spots may crack and peel
The characteristic stains and peeling of the bark are typical symptoms of raspberry shoot dieback
Fig. made available by Mr. Adam, our Reader. Thank you!
The symptoms of this raspberry disease can also be seen on the leavesin the form of brown spots along the main nerve.
As a result ofraspberry shoot dieback , the yield drops significantly, the bushes become less resistant to frost and their shoots gradually die.
Dieback of raspberry shoots
Fig. made available by Mr. Adam, our Reader. Thank you!
Dieback of raspberry shoots
Fig. made available by Mr. Adam, our Reader. Thank you!
Dieback of raspberry shoots - combating
Raspberry shoot dieback is favored byexcessive soil moisture and excessive bushes thickening. To counteract the development of the disease, you shouldavoid planting bushes too densely , regularly prune raspberries to remove unnecessary shoots that excessively thicken the bush, and regularly care for plants and regularlyremove shoots with symptoms of infection (preferably cut the affected parts of the plants and burn them immediately). Weeds should also be removed on an ongoing basis, as weed infestation in the soil under raspberries creates a microclimate favorable to the development of fungal diseases. It is also advisable to mulch the soil under the bushes.
Good to know
Pest favors the development of raspberry shoot diebackstalk midgeIt lays eggs in cracks and wounds on young shoots of raspberries. Hatching midge larvae feed under the skin of the shootsfacilitating the penetration of the fungus inside them At the site of infection, shoots turn brown, become brittle, water conduction to the top of the shoot stops, and shoots die in early spring. The fungus itself, without the midge's participation, only damages the cortical crumb of the shoot, without penetrating into the wood.Spraying against this pestis performed during the flight of flies, usually when young raspberry shoots reach a height of 20-30 cm. We spray mainly the lower parts of the shoots. The insecticide Mospilan 20 SP will be helpful in amateur crops.
dieback of raspberry shoots - spraying
Unfortunately, removing infected shoots is not enough andspraying against dieback of raspberry shoots is also necessary
The first spraying of raspberries is done in spring, usually when young raspberry shoots reach 10- 20 cm in height, and every 7-10 days until harvest, with a grace period for individual agents. Fungicides with different mechanisms of action are used alternately. These can be such preparations as: Mythos 300 SC, Rovlar Auaflo 500 SC, Signum 33 WG, Switch 62.5 WG.
If we want to avoid the use of chemical preparations, it is worth reaching for the very effective in the fight against dying raspberry shoots , the biological agent Polyversym WP. This ecological preparation contains a beneficial fungus that parasitizes pathogenic fungi. On raspberriesit limits the development of shoot dieback and gray mold, so it fights two problems at once!
On autumn raspberriesPolyversum WP spraying against shoot diebackis performed when the young raspberry shoots reach 15-20 cm in height. The treatment can be repeated after 14 days.
On summer raspberriesthe first spraying is done in the spring, right after the vegetation starts, and the next spraying after harvesting the fruit to protect the new one-year-old shoots.2 g of Polyversum WP is enough to spray 100m² of raspberry beds.
