What about the rust spots on the leaves of hibiscus
First, symptoms
The leaves of the plant gradually grow some round or irregularly shaped markings, which are relatively small, showing about 1 mm to a few millimeters, looking yellowish brown and some dark brown. Unsurprisingly, these brown spots are surrounded by a yellow halo, and these plates are made up of brown spots. Seriously, it will show that the whole leaf is covered with these terrible things, the leaf will change, and then it is easy to fall.
Second, the reason
It can be said that it is mainly due to the fact that a fungus called the subphylum fungus and a variety of other bacteria damage the plant together or in a mixture. These bacteria are in the form of hyphae or fruiting bodies that spend the winter on diseased leaves and then spread through wind and rain. It is usually due to the poor permeability of the planting area or the fact that the weather is always warm and rainy.
III. Methods
The first step is to quickly pick off these diseased leaves and burn them all together, so as to avoid further spread of the bacteria.
(2) Prevention and treatment. The branches and leaves can be regularly sprayed with 600 to 800 times the liquid of Guoguang Yintai, coupled with Guoguang Sitalin, which can effectively prevent disease while replenishing it.
If you are just sick and not too serious, you can spray 25% of prochloraz EC or 50% of polymanganese zinc wettable powder on the branches and leaves for 2 or 3 times in a row. Once a week.
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They are the ones that raise succulent plants in April, which are even more terrible than scale insects.
Many meat friends have been very depressed recently, looking forward to the meat gaining weight in the spring, but competing with diseases and insect pests. First, they are in a great hurry to eliminate scale insects, but as a result, aphids and powdery mildew come again, which is really annoying to death! Today, Huahua will tell you how to kill insects and pests so that the flesh can grow up safely!
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What if the leaves of Cymbidium are too long?
The emergence of this phenomenon has a great impact on the ornamental. If the plant grows too much, the result is that the leaves are too long. The most likely reason is that the surrounding environment is too dark. Well, the corresponding solution is, of course, to put it in a place with better light. In addition, a little KH2PO4 solution can be sprayed on the leaves at the right time, which is beneficial to increase the width and hardness of the leaves. However, there is another situation, that is, the problem of variety. Some varieties have relatively long leaves, so there's no need to worry.
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