Biological control is based on biological pesticides, pollution-free pesticides, specific pesticides, low-toxicity, low-residue pesticides, to replace the current method of applying a large number of chemical pesticides to prevent pests. With the development of economy and improvement of living standards, people are increasingly concerned about their own health and living environment. Traditional chemical prevention and control will be gradually replaced by low-toxicity, low-residue pesticides and biological control, which deserves more attention in flower cultivation. .
Biopesticides generally refer to agents that control pests and diseases with living organisms (mycelium, semi-cystine crystals, insect viruses, etc.). Compared with chemical pesticides, biopesticides have no residue, no pollution, no environmental pollution, and can be used for specific effects. For related diseases, pest species (ie target). At present, the most widely used at home and abroad are bacterial pesticides, antibiotics, insect hormones, entomopathogenic nematodes and insect virus pesticides.
I. Biological pesticides for controlling flower leaf pests
The following insecticides are used to prevent and treat flowers such as ulnar, poisonous moths, caterpillars, yellow-spotted moths and tussah moths.
1. Insect growth regulators (bionic pesticides)
Diflubenzuron series insecticide is a new type of insect growth regulator. Its mechanism of insecticidal action is to inhibit chitin synthesis of insect epidermis. Diflubenzuron is mainly a stomach poison, but it can also invade the insect epidermis. The medicament has the advantages of special action mechanism, good control effect, long residual effect period, low prevention and control cost, resistance to rain shower, insect resistant to drug resistance, flower plant and environmental safety, and the like.
(1) Diflubenzuron No. 1: Diflubenzuron No. 1 is also known as diflubenzuron, enemy killing spirit. It is stable in acidic and neutral media and decomposes in alkaline media. Low toxicity to humans and livestock. The formulation contains 20% diflubenzuron suspension agent and 25% Trifluralin WP. Diflubenzuron 1's main role is stomach poisoning and contact toxicity, so that when the larvae do not form a new skin epidermis, parasite malformation and death. It has special effects on Lepidoptera pests and is also effective against many pests such as Coleoptera and Diptera. When controlling the armyworm, yellow thorn moth, hawkmoth, and ulnar gills, dilute about 2000 times with water to spray.
Diflubenzuron 1 has a significant precipitation phenomenon. When used, it must be shaken first and then diluted with water; it cannot be mixed with alkaline pesticides; flowers cannot be used when there are mulberry gardens nearby.
(2) Diflubenzuron 3: Also known as Suurea 1 or Diflubenzuron. Pure product is white crystal. The performance of light and heat is relatively stable, and the alkali and strong acid are easily decomposed. Stored at room temperature is relatively stable. It is a non-toxic pesticide and is safe to natural enemies. The formulation was a 25% diflubenzuron suspension.
Diflubenzuron 3 is an insect growth regulator. The agent is mainly stomach poisoning, but also some insect larvae can not immediately molt and die immediately. The larvae no longer take food after taking the medicine. Generally, the larvae begin to be disabled within 3 days after spraying and reach a peak of disability after 5 days. Since the adult does not molt, the agent is not effective for adults. Diflubenzuron 3 has special effects on Lepidoptera pests. For the control of pests such as big moths, ulnar catfish, and yellow caterpillar moths, 25% diflubenzuron can be used for spraying from 2000 to 2500 times. The use of diflubenzuron 3 dilute water 800 to 1000 times spray control leaf miner and other effects are very good. Diflubenzuron No. 3 suspension has a precipitation phenomenon. When used, it should be shaken and diluted with water. Before the third instar larvae, the application of pesticides has high control effect, and the application efficiency of the pesticides is low in the larvae at the advanced stage. Therefore, the dosage should be increased appropriately. In addition, it should be stored in a cool place.
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