Yellowing and dropping of rhododendron leavesis a common occurrence. When something like this catches our rhododendrons, we wonder what the cause could be. Are these mistakes made in the cultivation or maybe an attack of a disease or pest? Seewhy rhododendron leaves turn yellow and fallHere are proven ways to help rhododendrons with yellowing leaves!
Why do rhododendron leaves turn yellow and fall?
Fig. ANTOś 113, forum.PoradnikOgrodniczy.pl
Rhododendrons belong to the group of shrubs that require specific climatic and soil conditions for proper growth and development.If we do not provide them with a suitable position, they will become weakened and more likely to develop fungal diseases. Here are the3 Causes of Rhododendron Leaves Yellowing and Falling!
1. Rhododendron leaves turn yellow and fall off because the bush grows in unsuitable ground
Rhododendrons grow badly, get sick and die on calcareous soils , barren and dry, but also wet and too heavy, impermeable. In order to create appropriate conditions for them, it is advantageous to add acid peat to the substrate or crushed coniferous bark. You can also use a special soil mixture for rhododendrons. If we do not guarantee the acidic pH of the soil, preferably in the range of 4.5-5.5rhododendron leaves will start to turn yellow and fallAdditionally, when growing rhododendrons, use a mulch that will keep the substrate moist, appropriate pH and protect the tiles root system against frost, drought and weed infestation.
2. Rhododendron leaves turn yellow and fall off because it lacks micronutrients
Yellowing of rhododendron leaves may be caused by a deficiency of micronutrients, among others. iron.Rhododendron leaves turn yellow between the veins or completely, after some time they may fall off the bushIn the cultivation of rhododendron, it is worth analyzing the soil and supplying the appropriate nutrients, supplying the plants with soil and foliar fertilizers. You can reach for the iron chelate available on the market, with which we spray plants in a concentration of 0.5%, or regularly fertilize rhododendrons with specialized fertilizers, intended for acidophilic heather plants.
3. Rhododendron leaves turn yellow and fall off due to fungal disease attack
Prevention of rhododendron diseases consists primarily in maintaining the appropriate acidity of the soil and its constant moisture. Weak, poorly managed plants are more often attacked by rhododendron fungal diseases.
The most common disease of rhododendrons is phytophthora, i.e. root rot, which is manifested by the sudden wilting of the plant due to the die of roots. Rhododendron leaves turn yellow, curl in a boat and hang down on the stem or fall quicklyPhytophthorosis is often confused with a deficiency of micronutrients, but it is worth checkingif there are no brown tips on the tops and edges of the leaves spots, shoots do not turn brown, and necrosis does not spread to leaf bladesIf so, we are dealing with rhododendron fungus disease.
Infected plant parts should be cut a few centimeters below the necrosis, and then watered and sprayed with preparations such as Magnicur Energy 840 SL, Proplant 722 SL, Polyversum WP. Phytophthora is a dangerous disease which, unfortunately, sometimes causes rhododendrons to die completely. Then the rhododendron should be dug up, burned, and the place after it should be decontaminated with Magnicur Energy 842 SL.
The protection measures and fertilizers mentioned in the article are usefulin the care of rhododendrons and combating leaf diseasesyou can order in our store. We guarantee high quality products, low price and fast shipping.To see the available preparations, press the button below.
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MSc Eng. Joanna Białowąs
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