Dichlorvos or 2,2-dichlorovinyl dimethyl phosphate (commonly abbreviated as an DDVP is an organophosphate, widely used as an insecticide to control household pests, in public health, and protecting stored product from insects.
Use
It is effective against mushroom flies, aphids, spider mites, caterpillars, thrips, and whiteflies in greenhouse, outdoor fruit, and vegetable crops. It is also used in the milling and grain handling industries and to treat a variety of parasitic worm infections in dogs, livestock, and humans. It is fed to livestock to control bot fly larvae in the manure. It acts against insects as both a contact and a stomach poison. It is available as an aerosol and soluble concentrate. It is also used in pet collars and “no-pest strips” in the form of a pesticide-impregnated plastic; this material has been available to households since 1964 and has been the source of some concern, partly due to its misuse.
Mechanism of action
Dichlorvos, like other organophosphate insecticides, acts on acetylcholinesterase, associated with the nervous systems of insects.
Application:
It is effective for pests of chewing mouthparts and piercing mouthparts. It can be used for vegetables, fruit trees and various farmland crops.

To control cabbage worms, cabbage armyworm, cabbage leaf bee, cabbage aphid, cabbage borer, and armyworm, use 1500-2000 times liquid spray of 80% EC.

To control 28-star ladybug, tobacco worm, whitefly, cotton bollworm, diamondback moth, lamp moth and armyworm, spray with 80% EC.

For the prevention of red spiders and aphids, spray with 1000-1500 times of 50% EC.

To prevent and treat small ground tigers, yellow squash, and yellow bentgrass beetles, spray or irrigate roots with 80% EC 800-1000 times.

To control the whitefly in the green house, spray it with 80% EC 1000 times solution to prevent the adult and nymphs. Spray one drink every 5-7 days and spray 2-3 times to control the damage. It can also be fumigated with Dichlorvos smoke agent by sealing the fumigation in the protected area before closing work in the evening, using 22 kg of Dichlorvos smoke agent 0.5 kg per mu. Or put a few burnt briquettes, use 0.3 to 0.4 kg of emulsifiable concentrate per mu.

To control bean stem borer, during the blooming period of cowpea (2 to 3 flowers are relatively concentrated), spray 80% of Dichlorvos 80% EC 1000 times when the petals open before 8 in the morning, focusing on spraying buds, flowers, tender pods and floor flowers, continuous spray 2 to 3 times.

1. Maggot control: Add 1 part of the original solution(50% emulsion) to 500 parts of water, spray on the pit or sewage surface, and use 0.25~0.5ml of the original solution per square meter.
2. Lice extermination: Spray the cover of the above dilution and let it sit for 2-3 hours.
3. Mosquito control: 2 ml of the original solution, add 200ml of water, splash it on the ground, close the window for 1 hour, or hang it in the room with a cloth strip soaked in the original solution, use about 3~5ml for each house, which can keep the effect for 3~7 days.
4. Extermination of bed bugs: 1 part of the original solution, 200 ml of water is added to brush the gap.