Raspberry diseases
Since we live in the north, we have to bend the raspberries to the ground in winter. As usual, this year in the fall they cut off the old branches, leaving new shoots, but when they began to bend them to the ground, the strong-looking and good shoots broke off right at the root, the inner part of the stem was eaten by some kind of larva or worm. Tell me, who knows what this could be and how to deal with it.
It looks like a raspberry gall midge - it is a larva that makes its way into the stem of a plant through small cracks, and then the stem begins to break and rot. You can fight it with chemicals. But prevention is more effective. In the fall, you should carefully examine the raspberry bushes. Where the swelling has formed is where the parasite nests. The affected stem should be cut off.
You have larvae on your raspberries, but we have a different reason: for some reason it blooms well, but as soon as the fruits begin to set, the whole bush dries up, and we don’t know what the reason is!
Symptoms of the disease: small brownish-purple spots appear on annual raspberry shoots (mainly at the site of leaf attachment).
As didymela develops, the spots increase in size (up to 2 cm or more), the spots become dark brown with a light center, where brown and black tubercles appear.
Next season, the spots on the raspberry shoots become lighter, and the tubercles on them appear more clearly. After some time, the tubercles crack and the bark peels off (fungal spores come out).
Massive damage to raspberry shoots was noted at the end of September.
Measures to combat didimela (raspberry shoot burn): raspberry plantings should not be allowed to thicken, because this prevents ventilation and lighting of the bushes.
If necessary, to combat raspberry didymela, you can use nitrafen or Bordeaux mixture (300 g per 10 liters of water) in the spring before the buds open.
At the beginning of the growing season (when shoots grow 15-30 cm), before flowering and after harvesting, spray with 1% Bordeaux mixture (100 g per 10 liters of water).
Spraying is carried out in compliance with all rules
Cause of the disease: fungal disease.
Didimela (stem spotting, shoot blight) of raspberries is spread by conidia in the summer.
It is better to treat in advance with special means. This crap can do a lot of harm.
Or maybe someone knows what to do with aphids on raspberries? Have you already sprayed it for prevention, but it still appears every year? Is this related to the ants that live next to the bush?