Raspberry itself is quite unpretentious, gardeners grow raspberries for years, take rich crops, making a minimum of effort to maintain plants in good condition. For what reason, besides natural autumn wilting, can this happen?
To find out a specific problem that is relevant for a particular case, you need to consider why raspberries can turn yellow.
External factors causing yellowing of raspberry leaves
The main external causes of yellowing should be called moisture deficit and lack of nutrients. The lack of watering in a drought has a bad effect on the health of raspberries, it is necessary to exclude drying of plants, providing, if necessary, additional regular watering. That plants lacked nutrients, should be annually enrich the soil with fertilizers, primarily - nitrogen, but no frills. Excessive amount of fertilizer is also bad for the condition of the bush.
Yellow Raspberry Disease
Yellowing of raspberry leaves can be observed with good care, when everything is fine with soil moisture, fertilizers. Pale, yellow, coiled leaves are observed in diseases - fungal, viral, bacterial. First of all, mention should be made of raspberry root cancer - root goiter, when the root system acquires growths up to 10-12 cm in diameter. They have no form, at first they are light, then they darken. Plants cannot receive proper nutrition through the roots, which leads to yellowing.
The disease is transmitted through wounds on the root system, the disease develops most intensively in drought, with raspberries on the same soil for a long time, especially if it is alkaline. With yellowing of leaves and a sharp decrease in productivity, it is necessary to check the root system. If structureless growths, root tumors are found, it is necessary to completely dig out the affected bushes and burn them. Then it is recommended to disinfect the soil.
Interesting fact: Do not plant new raspberry bushes where old ones used to grow. This approach will eliminate a lot of problems. After raspberries or before planting, the soil is perfectly restored due to mustard, alfalfa, which are worth sowing in the above-mentioned spaces.
Rust and raspberry chlorosis
A fungal disease called rust occurs in many plants. It is accompanied by a strong decrease in productivity, deterioration in the taste of fruits, and a decrease in winter hardiness. Particularly strong rust spreads in conditions of high humidity at high ambient temperatures. Symptoms vary well, already from spring - on small leaves appear small yellowish-red pads in which spores mature. The affected plant quickly loses strength, develops poorly. Pillows with spores burst, the disease spreads. If the leaves turn yellow with the appearance of such symptoms, it is necessary to spray with drugs.
Chlorosis also causes yellowness on the sheets, it begins to spread from space along the main veins.The affected plant gives weak shoots, the berries dry on the vine, become small. Parasites carry the disease, it can begin with an invasion of aphids, ticks. If diseased plants are found, they must be dug up, burned.
How to avoid yellowing raspberry?
To eliminate the risk of yellowing raspberry leaves, it is necessary to ensure timely watering of plants and fertilizer. It is also necessary to take preventive measures, exclude diseases. It makes sense to choose varieties that are obviously resistant to disease. Periodic spraying from pests is also beneficial.
It’s also worth it to discharge raspberry, remove part of the leaves with excessive density, plant shrubs, pruning - such measures help ensure plants health.
Thus, raspberry leaves turn yellow with a lack of moisture, nutrients, or from diseases. To exclude yellowing, it is necessary to properly care for the bush.
