How to treat the worms in the trunk of the camellia tree?

Camellia is a traditional ornamental flower in China, which is cultivated all over the country, bringing huge economic benefits to the majority of flower and tree growers. Camellia sinensis is also a flower and tree with many pests and diseases. More than 30 species have been observed.

How to control camellia flower pests and diseases?

Rot diseaseCamellia rot disease is a devastating disease. The damaged seedlings will die within 2 to 3 years, which is one of the most harmful diseases of camellia planted at present. The disease is highly selective in different camellia species, and the 'Hongluzhen' of the same plot may be completely wiped out due to the disease, while the nay winter or tea plum may be undamaged.

Generally, more than 5 years old 'Hongluzhen' or other camellia with thick cortex are susceptible to infection, and seedlings more than 8 years old are seriously damaged. The pathogen mainly infects the trunk and near the branch point, and the cortex gradually cracks after infection, exposing the xylem. After the split skin area gradually expands, the tree body also declines more and more, which is very easy to cause other diseases, such as red leaf blight, brown spot, sunburn, etc.

Finally, the lesions form an annular peel, which completely blocks the flow of sap, and the above parts of the disease die. In general, the disease takes about 2 to 3 years from infection to death. At present, the incidence of disease in Ningbo, Zhejiang, Sanming, Fujian and other areas is serious.

Prevention and control methods:There is almost no effective way to treat the disease during the growing season. Therefore, the focus is on prevention, first of all, it is necessary to strictly control the seedlings and strictly prevent the introduction of seedlings from the epidemic areas.

In the dormant period of the disease (winter), for the plants that have just been infected, spraying 300 times the solution of 43% tebuconazole suspension + 100 times the solution of 5% octycosamine EC, or 300 times the solution of the tree protection general, or 3 5 Baumé stone sulfur mixture, can repair the plants that are not seriously damaged. In addition, in the growing season, high concentration of 500 1000 times of Pythium oligoandrogens can reduce the impact of the disease on growth. Plants that have shown obvious decline should be decisively cut down.

AnthraxAnthrax is one of the most common diseases of camellia, with an incidence rate of not less than 30% in the natural state, and is one of the important diseases in the cultivation of camellia, camellia plum and camellia. The disease infects leaves and young shoots, and both old and young leaves are susceptible to infection, causing a large number of defoliation, dead shoots and dead tops. The disease prefers high temperatures, and the general temperature above 26 is conducive to the infection of the disease, especially after the high temperature burns the leaves in July, the wound is easy to infect, so July and August are the peak period of the disease.

Prevention and control methods:Camellia sinensis is an acid-loving plant, so you must choose acidic or neutral soil for cultivation. In addition, Camellia sinensis is a shade-loving plant, and most varieties should not be exposed to the sun, and interplanting under trees is conducive to reducing diseases.

At the beginning of the disease, it can be used alternately with 25% prochloraz emulsifiable concentrate 800 times, 25% bromium clear wettable powder 500 times, 10% difenoconazole water dispersible 1000 times, oligoandrocytia wettable powder 7500 times, generally used twice in a row, with an interval of 7 to 10 days. In addition, in the high temperature season, prevention should be the mainstay, with the prevention and control of small green leafhoppers, thrips and other insect pests, every 15 20 days to prevent 1 time, can basically control the large-scale occurrence of the disease.

Camellia has poor adaptability, and cannot move the position of the pot at will during the budding and budding period from April to September, so as to avoid the leaves that originally leaned on the shady side from suddenly coming into contact with strong light and withering.

Apply a little lime to the trunk, lime has a certain bactericidal and insecticidal effect. When applied with lime, it kills the insects on the trunk.

First of all, it is necessary to cut off the branches and leaves that are already seriously infested and destroy them by fire. Secondly, it is necessary to use the method of spraying. It is recommended to use 500 times of 40% phosphodiphosphine EC, 600 times of 48% chlorpyrifos EC + 800 times of 25% thiazinone wettable powder, 1000 times of 3% hypertonic phenoxycarb EC, and 1000 times of 25% diaformamidine wettable powder in high temperature seasons above 30.