Biological control is based on biological pesticides , pollution-free pesticides, specific pesticides, low-toxicity and low-residue pesticides, replacing the current large-scale application of chemical pesticides to control pests and diseases. With the development of the economy and the improvement of living standards, people are more and more concerned about their own health and living environment. Traditional chemical control will be gradually replaced by low-toxicity, low-residue pesticides and biological control, which is more worthy of attention in flower cultivation. .
Biological pesticides generally refer to the use of biological living organisms (mycelium, hemispore crystals, insect viruses, etc.) to control pests and diseases. Compared with chemical pesticides, biological pesticides have no residue, no pollution, no pollution, and can be used exclusively. Relevant diseases, pest species (ie targets). At present, the most widely used pesticides at home and abroad are bacterial pesticides , antibiotics, insect hormones, entomopathogenic nematodes and insect virus pesticides.
1. Biological pesticides for controlling flower leaf pests
For the control of flower mites, venomous moths, caterpillars, yellow thorn moths, tussah, etc., the following medicines can be used:
1. Insect growth regulator (bionic pesticide)
The chlorfenapyr series insecticide is a novel insect growth regulator, and its insecticidal action mechanism is to inhibit chitin synthesis of insect epidermis. The chlorfenapyr is mainly a stomach poison, but it can also invade the insect epidermis. The medicament for controlling leaf-feeding pests has the advantages of special action mechanism, good control effect, long residual effect period, low control cost, rain-resistant showering, pest resistance, resistance to flower plants and environmental safety.
(1) Diflubenzuron No. 1: Diflubenzuron No. 1 is also known as diflubenzuron and dichlorfen. It is stable in acidic and neutral media and decomposes in alkaline media. It is low in toxicity to people and animals. The preparation contains 20% diflubenzuron suspension, 25% dichlorpyrifos wettable powder. The main role of chlorpyrifos No. 1 is stomach poisoning and contact killing, so that when the larvae molt, they cannot form a new epidermis, and the worm body deforms and dies. It has special effects on lepidopteran pests and is also effective against a variety of pests such as coleoptera and diptera. When controlling the armyworm, yellow thorn moth, hawk moth, and ruler, dilute with water to dilute about 2000 times.
Diflubenzuron No. 1 has obvious precipitation phenomenon. It should be shaken first and then diluted with water; it should not be mixed with alkaline pesticides; it can not be used when there is mulberry garden near the flowers.
(2) Diflubenzuron No. 3: also known as diurea No. 1 or chlorfenapyr. Pure product is white crystal. It is more stable to light and heat, and is easily decomposed by alkali and strong acid. Storage at room temperature is relatively stable. It is a non-toxic pesticide that is safe for natural enemies. The formulation is a 25% chlorfenapyr suspension.
Diflubenzuron 3 belongs to insect growth regulators. The agent mainly has a stomach poisoning effect, and some insect larvae can not be molted and immediately die. The larvae no longer take food after taking the medicine. Generally, the disability is started 3 days after spraying, and the peak of disability is reached in about 5 days. Because the adult does not molt, the agent is not effective against adults. Diflubenzuron No. 3 has a special effect on lepidopteran pests. When controlling pests such as the big bag moth, the ruler and the yellow thorn moth, it can be sprayed with 25% chlorpyrifos 2000 to 2500 times. It is very effective to use the Diflubenzuron No. 3 to dilute 800 to 1000 times with water to control the leaf miner. There is a precipitation phenomenon of the chlorpyrifos No. 3 suspension, which should be shaken and diluted with water. Before the larvae are three years old, the application of the drug is high, and the application of the larvae at the advanced age is low, so the dosage should be appropriately increased. In addition, it should be stored in a cool place.
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