Hello everyone, I am a plant grass worm, love greening love to raise flowers, today some netizens asked, my rhododendron potted plant what happened? The leaves are covered with loess-like patches, and red spiders cannot be found.
Knock on the key: rhododendron is indeed prone to diseases and insect pests, common is red spiders, insect shell insects, as well as powdery mildew, leaf spot disease and other diseases and insects, as well as fertilizer, water damage and other hazards, rhododendron in the high temperature and humid summer, indeed the same to pay attention to the prevention and control of diseases and insect pests, reasonable fertilization, otherwise it is easy to yellow dead leaves, serious direct root dead seedlings.
Let's take a look at the pictures provided by netizens:
The picture above is the azalea potted plant maintained by netizens, we look at the description of the netizens, this pot of rhododendron leaves appear loess-like color spots in the summer, spread to the whole plant, and finally so that the leaves are going to fall off, the whole plant into a light pole, but not necessarily dead, I feel that this is the cause of the heat, because when this phenomenon occurs, even if you get to the north window sill to avoid the sun, this spring new leaves will fall off, sad to the extreme, what is the reason, please crane friends and the god to point out, here thank you first, and did not find the red spider, Insect pests such as scallops.
What's the problem with the yellowing of the leaves of the rhododendron potted plant like rust? It turned out that the military insects were at work
Obviously, this pot of azaleas of netizens is endangered by the military insects, we come to know the next military insects, in fact, also called rhododendron crown net bugs, mainly endanger the leaves of the rhododendron, causing the leaves to turn yellow and green, and the leaves look rusty, which is not good for the growth of the rhododendrons, because after destroying the leaves, the photosynthesis of the leaves has an impact, resulting in the growth of the rhododendrons getting weaker and weaker.
For military insects, you can use parathrin pesticides such as cypermethrin, cypermethrin, enemy killing, nicotinic pesticides such as imidacloprid, acetamidium, small white medicine furazine, as well as avermectin, methyl vitamin salt, oxidized fruit and other broad-spectrum insecticides can be, the egg period of the insect is about 15 days, for safety reasons can be sprayed again every 15 days, sprayed 2 to 3 times. It is best to spray in the evening after the sun has set, and spray both sides of the leaves.