Matters needing attention in pest control of Dendrobium candidum

Traditional Chinese medicine is a special commodity for people to prevent and treat diseases. The production of traditional Chinese medicine not only requires a certain output, but also needs to pay more attention to the quality of medicinal materials. Therefore, in the application of various measures for the prevention and control of diseases and insect pests of traditional Chinese medicine, we should not only control the harm of diseases and insect pests, but also not reduce the quality of Dendrobium candidum, and avoid the damage of pesticide residues and other pollution to traditional Chinese medicine. Agricultural prevention and control law is a method to reduce or control the capacity of diseases and insect pests through a series of measures such as adjusting cultivation techniques. Most of them are preventive, and this method mainly includes the following aspects:

(1) reasonable rotation and intercropping

In the cultivation system of medicinal plants. Reasonable rotation and intercropping are very important for the prevention and control of diseases and insect pests or the full use of soil slope fertility. For example, many soil diseases do serious harm to ginseng and American ginseng, and the land where ginseng has been planted can no longer be planted in a short period of time. Otherwise, the disease is serious and will cause a large number of deaths or destruction of the whole field. The length of rotation generally depends on the duration of survival of pathogens on the soil slope. For example, the rotation periods of root rot of Atractylodes macrocephala Koidz and sunflower of Rehmannia glutinosa are 3-5 years. Besides. Reasonable selection of rotation crops is also very important, in general, plants of the same family or the same host of some serious diseases and insects can not be selected as the next crop. The principle of crop selection should be basically the same as that of rotation crops.

(2) farming

Deep ploughing is an important cultivation measure, which can not only promote the development of plant roots and enhance the disease resistance of plants, but also destroy the dormant nests of insects and the overwintering places of bacteria. Directly destroy pathogens and pests. For example, ginseng and American ginseng require the land to play and relax for a year before sowing. Carry on the arch turn to dry the number to chase. To improve the physical properties of Tucheng. Reduce the number of pathogenic bacteria in Tucheng and. This has become one of the important prevention and control measures in the basin.

(3) weeding, pruning and garden cleaning

After harvest, the remains of medicinal plants harmed by diseases and insect pests and the dead branches and fallen leaves falling in the field. It is often a hiding place for diseases and insects and a place for overwintering, and it is the source of diseases and insects in the following year. Therefore, weeding, Qinggu pastoral and combined with pruning will be Dendrobium candidum disease and insect remains and litter, burning or deep burial treatment can greatly reduce the degree of disease and insect damage in the coming year.

(4) adjust the sowing date

Some diseases and insect pests are often closely related to the phenological phase of a certain growth and development stage of cultivated drugs. If we try to make the growth and development of Dendrobium candidum miss the dangerous period of mass transmission of diseases and insect pests. Avoid the harm of moistening insects. It can also achieve the purpose of prevention and control.

(5) rational fertilization.

Rational fertilization can promote the growth and development of medicinal plants, enhance their resistance and recovery ability after being damaged by diseases and insect pests. For example: Atractylodes macrocephala Koidz enough organic fertilizer, appropriate increase in majestic, potash fertilizer, can reduce mosaic disease. But the fertilizer or compost used must be rotten. Otherwise, the residual germs in fertilizer and the eggs of underground pests (such as tobacco squeezing, etc.) are not killed, which is easy to make underground pests and some diseases more suitable.

(6) breeding and utilization of varieties resistant to diseases and insect pests

Different types or varieties of medicinal plants often have significant differences in resistance to diseases and insect pests. For example, safflower with thorn type is more resistant to anthracnose and safflower fruit fly than safflower without thorn, and dwarf stem type of Atractylodes macrocephala is resistant to seed insects. Therefore, how to make use of these disease-resistant and insect-resistant characteristics. The ideal high-quality and high-yield varieties with resistance to diseases and insect pests were further selected. It is a very meaningful work.