Deltamethrin can be used as an insecticide for orchids

Also called decis, it is a pyrethroid insecticide newly developed in the 1970s. It was synthesized by Elliott in 1974 and produced by the French company Roussel-Uclaf in 1976. Its advantages are fast insecticidal action, strong knockdown power, and control of many pests, especially good control of pests with resistance. It uses small doses and few applications, has low toxicity to humans and livestock, causes little environmental pollution, and is harmless. It is a broad-spectrum insecticide with high efficiency, low toxicity, and low residue. Deltamethrin mainly acts by contact poisoning, and also has stomach poisoning, ovicidal, and antifeedant effects, but no systemic action. It is relatively toxic to fish, bees, silkworms, and other organisms. Formulations: 2.5% wettable powder and 2.5% emulsifiable concentrate. Target pests and methods of use: According to foreign reports, it can control more than 15O species of pests. On garden plants, it can be used to control aphids, whiteflies, slug moths, caterpillars, and many other pests. A use concentration of 10-2Omg/kg (PPm) gives good results. However, its effect on mites, weevils, and some scale insects is poor. It can also be used as a space residual spray to control mosquitoes, flies, cockroaches, and other pests. Precautions: It must not be mixed with alkaline agents such as Bordeaux mixture or lime sulfur mixture. Uniform and thorough spraying is required. After contact with soil, it is easily fixed by organic colloids in the soil, so it is not suitable for controlling underground pests. Safety protection should be noted when applying the pesticide. This pesticide can cause irritating allergic reactions to human eyes and skin. (Liu Zhongjian)