In modern times, chemical pesticides are used to control the diseases and pests of orchids. Excessive use of pesticides makes orchids vulnerable to drug damage. Long-term single use of chemical pesticides or frequent use will make pests and bacteria resistant and uncontrollable. Spraying pesticides will also pollute the environment, and in serious cases, it will poison people and animals. Pollution-free control of orchid diseases and insect pests has existed since ancient times and is common in modern times. Pollution-free control of orchid diseases and insect pests has the advantages of good effect, low cost, easily available materials, simple method, no pollution and no side effects, and is worth popularizing. The following are some folk remedies for pollution-free control of orchid diseases and insect pests.

First, tea bran

Tea bran, also known as tea bran and tea seed cake, is the residue left after tea seeds are pressed for oil, and farmers often use it to wash clothes. Tea bran contains saponins and glycosides, and its aqueous extract is alkaline, which has good stomach toxicity and contact killing effect on pests. Prevention and control methods:

1. Soak the crushed tea bran and boiling water in the ratio of 1: 5 for one day and night, and use it to water the orchid pots, and at the same time water the place where the orchid pots are placed and other orchid pots, which has a good control effect on snails.

2. Spraying blue plants with tea bran water has a good control effect on aphids and red spiders, which can reach 90%.

3. Tea bran water can also kill earthworms. Fill the pot with tea bran water, and after a while the earthworm will drill out of the surface and pick it out. Earthworms have different views on the merits of orchids. One view is that earthworms in flowerpots will destroy the hyphae of some orchids and hurt the root tips of orchids, so they are pests and must be removed. Another view is that earthworms in orchids can eat many rotten substances and rotten roots of orchids, and their activities can loosen the soil, and their feces can also be used as fertilizer for orchids without killing. Right and wrong should be observed by You Lan according to his own practice, weigh the pros and cons and make a judgment.

Second, cigarette butts

Tobacco leaves contain about 3% nicotine. Nicotine has strong contact toxicity and stomach toxicity to pests. Take 20 cigarette butts and 1 part quicklime, add water, stir, soak and filter, then add 30 parts of water and spray it on orchid plants, pot soil and pot bottom to kill wax-free pests such as ants.

Third, washing powder and detergent.

Washing powder can dissolve the cornea of scale insects, and at the same time form a layer of foam to wrap the insect body, so that the scale insects suffocate and die. Washing powder solution can control some pests and diseases. Control method: 1. Dissolve the washing powder in a small amount of warm water, dilute it with water to 1000 times, and spray orchid plants to kill aphids, whiteflies and red spiders. Diluted to 600 times, sprayed once every three days and sprayed three times, all the scale insects died. 2. Pig bile is mixed with clean water at the ratio of 1: 100, and a small amount of washing powder is used to spray orchid plants, which can prevent anthracnose and soft rot. Spray blue plants with washing powder solution. After the pest dies, the leaves must be washed several times with clear water to make the blue plant grow normally.

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