Yellow leaves on raspberries indicate an iron deficiency. Plants often suffer from what is known as chlorosis due to an incorrect pH value.
Unfortunately, raspberries and other types of fruit get yellow leaves again and again in the middle of the season. Chlorosis, also known as chlorosis, is caused by a lack of chlorophyll. However, the green dye is essential for survival, as this is where photosynthesis takes place. Chlorosis, which is usually caused by iron deficiency, should therefore be better treated.
Preventing chlorosis in raspberries
There are several different types of chlorosis, but they all have one thing in common: the leaves turn yellow and can die off after a while. Raspberry bushes with chlorosis usually have a reduced yield, which is of course very unpleasant. In addition to an iron deficiency, a magnesium deficiency is often to blame for the yellow leaves in raspberries.
In most cases, an incorrect soil pH value is responsible for the lack of iron and magnesium. The nutrients are actually present, but the plant can no longer absorb them sufficiently. The pH value in the soil should therefore be measured as a check. There are many test sets that are not expensive and handling is easy in most cases. If the pH value is above 6.5, it should be lowered to 5 - 6 with Epsom s alt or rhododendron earth. The required amount of Epsom s alt is always stated on the packaging. Incorporating compost doesn't hurt either. This loosens the soil and prevents waterlogging. Waterlogging can also be responsible for jaundice.
Treating and combating chlorosis" in raspberries
In very few cases is there an actual deficiency of iron and magnesium. However, if the pH is in the right range and the leaves are still yellow, a real nutrient deficiency is really the culprit. Fertilization can help here. A high-quality long-term fertilizer inOrganic quality such as our Plantura organic universal fertilizer is well suited for this. The fertilizer should definitely contain magnesium and chelated iron (Note: There is no chelated form of magnesium). The so-called chelate makes it extremely easy for the raspberry to absorb iron. Incidentally, liming raspberries is generally discouraged, as this makes it much harder for the plants to absorb the iron.
For more information on fertilizing raspberries, see our special article here.