Raspberry protection against pests and diseases in spring and summer

raspberry protection against pests and diseases in spring and summer Blog

Few people manage to grow raspberries on a plot and avoid diseases and pests. If you notice the trouble in time or take some preventive or curative measures, then you will not notice a tangible loss of the harvest. What protection of raspberries from pests and diseases in the spring will be effective? At what signs of deterioration of raspberries should you raise the alarm and take some measures? We list the initial signs of raspberry pest infestation and disease development, as well as protection measures.

By the way, gardeners for the note: yellow raspberry is practically not affected by diseases and pests, but it is poorly distributed in our gardens.

Signs of raspberry diseases, photos, description and control measures
The tops of raspberries have begun to mound or the leaves have curled

Most likely, your raspberry has been invaded by aphids. You may not always see it sitting on the underside of the leaves, because the aphids may have already moved on to other plants or may have died after completing their main task of leaving their eggs. The tops of the raspberry shoots should be cut off (there will be no more berries on them!) and burned.

But when the leaves curl all over the shoot – it is a viral disease – raspberry curl. It is impossible to save the planting, as well as the harvest – the berries wither still green. Such bushes should be immediately removed and burned.

Pale green with yellow mosaic on the leaves

If this strange two-color pattern appears on raspberry leaves, it is a sign of a viral disease. Viral diseases of plants cannot be cured. Such raspberries, alas, can not be saved. Raspberry plants with mosaic leaves are dug up and burned. Experts advise not to plant raspberries, blackberries and strawberries (strawberries) in this place for three to four years.

Ludmila Gorbacheva from Krasnodar, a member of our “Garden and Garden in Kuban” group, published a photo of her raspberry. The raspberries are sick. It can be seen. But, frankly, it is difficult to diagnose from this photo.

There can be at least three reasons for this pattern on the leaves.

The first one is chlorosis, that is, a lack of iron in the soil in the available form. The solution – dissolve iron sulfate (4 g or 1 teaspoon) in 10 liters of water, add citric acid (2.5 g or 1/2 teaspoon) – and you’re done. It is better to water with this solution under the root of the raspberry plants. By the way, in cold weather with sharp fluctuations in day and night temperatures, plants are not able to absorb iron. Therefore, wait for stable warm weather and feed your plants.

The second cause of yellow streaks on raspberry leaves is a viral disease. Perhaps the photo shows the initial stage of the disease. It would be necessary to observe … There is no treatment. Only by removing diseased plants can prevent the spread of the disease to other raspberry bushes.

And the third cause is closely related to the second – aphids. Aphids are the main carrier of viral diseases. This applies not only to raspberries. All berry bushes in the garden can be affected by aphids. To protect your plot from this scourge, preventive spraying against the pests should be carried out. There will be no aphids on the site – there will be no disease carriers.

Raspberry shoots have begun to wilt

It’s unpleasant, but not so scary. Your raspberry has been infested by the raspberry stem fly. Its larvae gnaw out the shoots from the inside, causing them to wilt. But don’t wait too long to treat it! The sooner you see infested stems and cut them off, the less damage will be done to your plants. Only the affected part of the stem with the caterpillar can be cut off. Although, if there are few of them, cut to the base and burn out of harm’s way.

Flowers and berries wither during fruiting

Why do shoots, flowers and berries wither during fruiting? Such an unexpected effect is caused by gallica on raspberries. Look closely, for sure on such shoots you will find characteristic thickenings or bumps – galls. They can be 1-2 on the shoot, but there can also be several per shoot. It is not necessary to count on the harvest from such a shoot, it will not happen. Immediately cut such shoots below the thickening (galls) and burn them. Most often, galls become visible on shoots in autumn, when autumn pruning of raspberries is made – there are no leaves anymore and trunks are well visible and outgrowths are more visible.

But thickenings (galls) on the shoot with withered fruits may not be. What is the reason in this case? It is a fungus that has worked – purple stem blotch. A very harmful fungal disease. It can kill the whole raspberry. Cut such shoots and burn them. After harvesting, immediately treat plantings with systemic copper-containing preparations (Ridomil, Polychom, Oxychom).

What if you notice that the shoots and leaves wither first, and then the berries or flowers wither away? Most likely it is a lack of moisture. Water more often and the situation will be corrected. In this case, mulching raspberries with cut grass, straw helps particularly well. After mulching, it is useful to fill the dry grass or straw with slurry or cowpea.

Raspberry leaves turn red and berries start to wither
Reddened raspberry leaves indicate that the raspberry has contracted anthracnose. It is believed that this disease affects weakened plants. But in summer heat and drought, all raspberries are weakened. To help raspberries can be as follows: cut the fruit-bearing shoots immediately, burn them, and after the end of berry picking, spray Strobi. This drug has proven itself in the fight against anthracnose.

There’s a white stain on the tops of raspberry shoots
A whitish patina on the tops of raspberries indicates that your plants are affected by powdery mildew. It most often appears on plants (raspberries, gooseberries, currants) in cold and wet summer. In such weather, Horus works perfectly, which (if there is no heat) is also great with the rest of the fungal diseases of raspberries.

I post a photo of a gooseberry bush with powdery mildew, because I have not found a photo of raspberries with such a disease in my archive. But powdery mildew on raspberries looks about the same – a whitish fluffy coating on the tips of the shoots.

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