Text/Small exquisite life
<h1>Raising camellias, 6 kinds of diseases and insect pests to be recognized, with pictures to illustrate, simple and intuitive</h1>
Camellia is one of the top ten traditional flowers in China, it has a beautiful plant type, thick green leaf color, rich variety, changeable flower color, and is deeply liked by flower lovers. However, although the camellia is beautiful, it takes a lot of effort to raise it well, and many novice flower lovers often encounter some diseases and insect pests in the process of raising camellias, but they don't know what to do, and they can only be in a hurry, not to mention prevention and control. So today's small exquisite life will learn the performance and control methods of several common pests and diseases of camellia flowers.
1. Fertilizer damage
When we apply base fertilizer or topdressing to camellia flowers, if the fertilizer is not fully decomposed or the amount is too thick, it is easy to cause fertilizer damage. The fertilizer damage is purely caused by improper human maintenance, which is manifested by yellowing or zoomed ulcers at the tip of the leaf edge, and gradually expands to the leaves of the whole plant, which will cause the camellia to fall and die when severe.
When fertilizing camellias, we must follow the principle of thin fertilizer and diligent application, and avoid applying raw fertilizer and thick fertilizer. If there is an unfortunate fertilizer damage, the fertilizer can be diluted with large water irrigation when it is mild, and it is necessary to remove the pot and replace the soil to re-pot when it is severe.
2. Bituminous coal disease
When camellias are in a high temperature, high humidity or airtight environment, it can cause bituminous coal disease. Bituminous coal disease mainly occurs on the surface of the leaves or young branches of camellia flowers, and there will be dark brown mold spots at the beginning of the victimization, and then it will gradually expand into a black mold layer, which not only affects the beauty of the plant, but also hinders the normal photosynthesis of the camellia and affects the health of the plant.
Bituminous coal pathogens are mainly transmitted by wind and rain, aphids and shell insects as vectors, and in the high temperature and high humidity of the unventilated environment, the bacteria will wake up and multiply rapidly and cause disease. Therefore, in the maintenance process of camellia flowers, we need to eliminate aphids and aphids in time, while paying attention to the ventilation and light transmission of the maintenance environment; if it has been infected with diseases, we can scrub clean the damaged leaves with clean water and spray wettable powder sterilizers.
3. Blight
In the warm and humid weather of spring, camellias are prone to dry shoots and trunk epidermal ulcers. Specific symptoms are sudden wilting of the new shoots of camellia flowers; the leaves are also withered, the base of the joint with the branches becomes black, but does not fall off immediately; and the base of the old branches will be ulcerated with yellow-brown spots. Lesions can change rapidly with increasing temperature and humidity, and in severe cases, can lead to the death of the entire plant.
Usually camellias should pay attention to maintaining environmental ventilation, if unfortunately infected, it is recommended to first cut off the diseased branches and leaves and thoroughly treat, and spray fungicides such as Bacillus Qing or Fumeishuang, apply more phosphorus fertilizer and potassium fertilizer, and apply less nitrogen fertilizer.
4. Sunburn
When the root system of camellia is weak and exposed to strong light, it is prone to sunburn, which is manifested by the bronze color of the leaf veins that have been unfolded, the yellowing phenomenon of the leaves at the beginning, and the gradual transformation of the spots to brown in the later stage, and finally death.
Avoiding strong light exposure is the main measure to prevent camellia burns, especially to avoid the sudden exposure of camellias with long-term shade. At the same time, watering should follow the principle of dry and thorough watering, avoid long-term accumulation of water, and do not dry for a long time, and the potting soil is the best state when it is wet and not wet.
5. Rust tick (rust spider)
When the young camellia leaves are yellow on the surface and russet spots appear on the back, it is likely that they are infected with rust ticks, rust ticks are very small, and mainly nymphs or adults suck the sap of young camellia leaves and young branches. In addition to the initial symptoms mentioned earlier, the later leaves will also have a reticulated white crack, and the sides and apex of the leaf will shrink and deform, and finally the leaves will fall.
In the case of high temperature and drought in summer and autumn, young camellias are easily infected with rusty ticks, so in addition to environmental ventilation, do not let the potted soil of camellias dry for a long time. If you have been infected with insect pests, you should clean up the diseased branches in time and spray insecticides such as avermectin on the front and back of the leaves to remove insects.
The above are 6 kinds of camellia common pests and diseases, we can identify and deal with the picture of the disease, due to the limited standard of living of small exquisites, there will inevitably be errors and omissions in the text, please add and correct in the comment area, let us make progress together!