Metallic fungicide

① Quadrine: 33.5% Kuaining water suspension powder. It is an alkaline pesticide. It has claw-like binding effect and is stable to thermal and chemical action. Its effect is that copper ion hinders dehydrogenase. Kuaide Zheng has a therapeutic effect and is effective against phytophthora bacteria. The affected area can be directly smeared or diluted. When using this agent, it should not be mixed with pesticides and fertilizers with strong acids or bases, and the times of application should not be too dense or frequent. The water quality used should pay attention to its PH value so as to avoid drug damage or decrease in efficacy.

② copper metoprolol: a mixture of 15% metoprolol and 61.5% alkaline copper oxychloride, 76.5% wettable powder such as dew. It belongs to alkaline pesticide. It has preventive and therapeutic effect. It has control effect on bacteria such as bacterial Erwioia and fungal phytopthors septoria colletotrichum. It has good permeability and can kill most bacteria. Its biggest disadvantage is that it is easy to cause drug damage when applied under high temperature and humidity, and it is easy to develop drug resistance when used continuously. The use of this agent should avoid mixed use with strong acid, strong alkali fertilizers or pesticides, and there should be no fertilizer residues such as seaweed essence on the plant before and after use.

③ Cu-Zn-mn Naipu: 52. 5% basic copper oxychloride is mixed with zinc Naipu 10% and manganese Naipu 10%, and 72.5% copper, zinc and manganese Naipu miscible powder. It belongs to alkaline pesticide. It has the effect of prevention and treatment. It is effective for diseases caused by bacteria and most fungi, and is suitable for the prevention and control of leaf diseases due to the lack of trace elements such as copper, zinc and manganese. When applied in the period of high temperature and humidity, it is easy to produce insect pests. If an excessive amount of developing agent is added during application, it is easy to attach the liquid to the leaves to form spots, destroy the epidermis of the leaves, and block the stomata, accumulate too much, and easily cause the leaf tip to scorch. It is best to use this agent alone, not with strong alkaline pesticides and fertilizers, and try to use it when the daily average temperature is above ZO ℃ and when the humidity is low in sunny days, so as to avoid unnecessary loss.

The germicidal effect of copper pesticide is to spread on the national orchid body to form a film to prevent the spore germination of the pathogen, or to dissolve copper salt by water, rain and dew and the secretion of the pathogen to dissolve copper salt into soluble copper ion and replace the normal H ", MG" and K "plasma in cells, hinder dehydrogenase, kill or prevent spore germination. The copper pesticide can enter the plant through the stomata of the plant leaves and kill the bacteria that have invaded the plant. on the other hand, it will also hinder the role of plant enzymes, and the chlorophyll is easy to be fixed, resulting in sudden changes in plant physiology. therefore, after the first use of copper as a disease control agent, the plant can show a thick green leaf color and so on. If it is used continuously for many times, the plant physiology will be out of order.

Generally speaking, due to the symptoms of drug damage caused by improper application of copper pesticides, leaves will burn, leaf tips and leaf edges will be scorched, and too many steel pesticides will be accumulated in the medium, which can easily cause root growth disorders, nutrient absorption disorders, and then affect the balanced growth of the whole plant. When selecting pesticides for disease control, cultivation managers should be very careful when using copper type pesticides, and occasionally use them once in the right time and in a suitable climate, which can promote the assimilation of Chinese orchid, increase the amount of chlorophyll, and prevent plant aging. the benefits of improving quality and yield.