By the appearance of the yellowing leaves I think your plants have a nutrient deficiency, predominantly nitrogen and potassium. All plants need nitrogen, potassium and phosphorous to thrive, plus various trace elements. Without nitrogen the leaves turn yellow and growth is spindly. Potassium generates good flowering and fruiting and helps ripen wood. Plants lacking potassium tend to have blue, yellow or purple tinted foliage and a poor crop.
Without phosphorous, which aids strong roots and shoots, leaves tend to be small and discoloured. The most common trace element deficiencies are manganese and iron, which cause yellowing leaves with brown edges.
Although you said you have been feeding with Miracle Grow twice a year I think it would be more beneficial to feed once a year in the spring ideally March when the canes are starting to grow. As a guide If your plants have good, thick stems that grow 4 to 6 feet tall, you are fertilising correctly.
Maxicrop Original Organic Seaweed Plant Growth Stimulant will give your fruit canes the valuable nutrients they require and aid their general health but it will also help protect them from pests and diseases. For plants to successfully grow, flower and fruit they need nitrogen, potassium, phosphorous and different trace elements. Without one or more of these, plants will start to display physiological symptoms — low nitrogen causes weak, yellow leaves, while a potassium deficiency results in poor harvests and discoloured foliage.
In summer, raspberries fail to thrive, the crop is poor and the leaves have a general unhealthy look. Pelleted poultry manure gives a quick boost of nitrogen, while organic compost gives a longer-term solution. Add bonemeal if your raspberries are short of phosphorous. Add sulphate of ammonia for nitrogen deficiency. Raspberries are also prone to getting viruses and if your canes are very old it may be an idea to invest in some new ones and plant them in a different position.
Most viruses are spread by aphids, so you must remove the old canes before planting the new ones. Use a fruit specialist, such as Pomona Fruits.
You can either buy bare-root in winter or plant containerised canes in the growing season. Autumn varieties don't need wire supports and they have a tougher constitution then summer varieties.
The opinions expressed are those of the author and are not held by Saga unless specifically stated. The material is for general information only and does not constitute investment, tax, legal, medical or other form of advice. You should not rely on this information to make or refrain from making any decisions. Ruby Gray wrote: This site has some words of wisdom which seem to confirm the rootrot diagnosis. Many plants get yellow leaves when there is an excess of rain, due to nitrogen being leached out of the soil, especially in cool spring weather.
Adding nitrogen and magnesium can help in this case. It's hard to tell from the photo whether the affected leaves are on primocanes this year's or floricanes last year's. The younger shorter leaves look OK. So perhaps cutting off all last year's canes would solve the problem, if it's not root rot. Otherwise, they would need to be dug out, destroyed, and new virus-free canes planted in a different spot.
Forum: berries. Raspberry leaves yellow and dying suddenly. Johnny Gisson. Optional 'thank-you' note:. The leaves on my Heritage are turning yellow and brown and dying. It's been raining almost everyday for two weeks. I hope it's not root rot. I just noticed it s I cut off the dead looking leaves. Maybe I should spray them with sulfur? I also just noticed some of the leaves have been chewed off. Yesterday I saw 4 deer in the yard.
One of them were walking in the area of the plants. I opened the window and slammed it and they all took off. Could the plants be dying because of deer chewing at them? Thanks Steve.
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