What Causes the Yellowing of Rose Leaves and How to Treat It
Sharing experiences on why rose leaves turn yellow and how to treat them, as well as related experiences about what to do when rose leaves turn yellow, the following details will be shared.
Causes of Yellowing Rose Leaves
There are many reasons for the yellowing of rose leaves, such as high temperature exposure, normal metabolism, root rot due to excessive watering, black spot disease, etc. Let's specifically introduce the reasons for the yellowing of rose leaves.
(1) High Temperature Exposure
The leaf tips become dry, and yellowish stains appear on the leaf surface after exposure to sunlight, which is usually caused by dehydration from exposure (starting from the leaf tips) or short-term sunburn. Remember to provide appropriate shade, especially during the noon to afternoon period.
(2) Normal Metabolism
The bottom old leaves turn yellow completely, which is a normal replacement of old leaves. Remove the yellow leaves, and if the upper part of the leaves is normal, there's no problem. If concerned, you can sprinkle some Ogreen 318S fertilizer granules near the roots.
(3) Root Rot Due to Excessive Watering
The normal leaves turn yellow with irregular coloration, and the pot surface stays damp for a long time, which may be due to excessive watering and root rot, often accompanied by bacterial diseases such as black spot and powdery mildew. Remember to ventilate more and control water appropriately.
(4) Fertilizer Burn
After fertilizing, a large area of leaf tips turns yellow with a burnt appearance, which is caused by too much fertilizer or fresh fertilizer. Remove the fertilizer, and for liquid fertilizers, lift the pot and water with clean water to flush out the fertilizer from the soil. In severe cases, change the soil directly.
(5) Black Spot Disease Yellow Leaves
After rain or if the water used for irrigation is not clean or the soil is not clean and contains fungi, it may cause fungal yellowing of the leaves.
Black spot is one of them. Leaves with black spots should be removed promptly, clean the soil surface near the pot and roots, and spray with Qibicai to inhibit fungi.
Moreover, black spot disease is one of the most common diseases in roses. In the early stages, black spots form on the leaves.
If not detected and treated in time, black spot disease can progress further, spread to other healthy leaves, and cause yellowing of the leaves.
(6) Spider Mites
Yellow leaves caused by spider mites have many spots and some spider silk. Spray miticides like Qihongsha or Aikacan around 3-5 PM, aiming at the affected areas, once a week. After no visible mites, spray once a month for prevention.
(7) Iron Deficiency Yellow Leaves
New leaves are light yellow with dark veins, which may indicate iron deficiency yellowing. Remember to water with an acidic nutrient solution or iron sulfate solution, diluted 1:2000, and water the roots. Initially, water every half month, and after the yellow leaves turn green, water once a month.
(8) New Potting Yellow Leaves
Yellow leaves in newly potted roses in the summer are normal. Use plenty of soil and compact it, but if there is too little soil or it is not compacted, the roots may not adapt to the pot, causing yellow leaves. After the roots adapt, the yellow leaves will gradually disappear.
The above sharing on why rose leaves turn yellow and how to treat yellowing of rose leaves provides specific information, hoping to bring some knowledge to netizens.