Rhododendron diseases and prevention methods

Azalea brown spot

When azalea is infected, small brown spots will appear on the leaves, which will gradually form large irregular spots. The leaves will then fall off, affecting flowering that year and the development of flower buds in the next year. Brown spot disease often occurs in the rainy season and in humid weather.

During daily maintenance, pay attention to increasing the environmental humidity, but also ensure timely ventilation and light. Apply organic fertilizer or nitrogen, phosphorus and potassium compound fertilizer in time to enhance the disease resistance of the plants. If the plant is found to be diseased, remove the leaves and spray Bordeaux liquid.

Azalea yellows

Azalea chlorosis is mainly caused by iron deficiency, especially in areas with alkaline soil, which will cause the plants to green up late. In severe cases, the edges of the leaves turn yellow. The chlorosis of azalea is most obvious on the top leaves, which is caused by iron deficiency.

Spray ferrous sulfate solution or alum fertilizer water regularly, of course household vinegar can also be used. If the plant is severely yellowing, you can poke a few holes about 15 cm in diameter in the potting soil with chopsticks and water it with a 1:30 ferrous sulfate solution, which can significantly increase the iron content in the soil.

Azalea root rot

When the disease occurs, brown water-like spots appear on the rhizomes of azalea, which gradually become wet and rotten and gradually spread upward. This will eventually lead to plant wilting, failure of terminal buds to sprout, root rot, and poor development. The leaves will also fall off, and some branches or the entire plant will appear as black and bare rods.

In daily maintenance, it is best to water the plant correctly using rainwater, river water, lake water or pond water. Well water or tap water should be left for 2 to 3 days before watering. In addition, spray fungicides in time when the disease occurs. In serious cases, remove the plant from the pot and clean the roots.