Introduction to Diquat
Diquat is a bipyridine herbicide. It has good systemic properties and is mainly contact-killing. After application, it can be absorbed by leaves and conducted upward in the non-symplasm, but cannot be conducted downward in the phloem. Therefore, it has poor effect on the root system. The herbicide can combine with soil particles in the soil, quickly passivate and lose its activity. The residual period in the soil is very short and has no effect on the next crop. It is often used for weeding in non-cultivated land such as roadsides, barren mountains, in front of and behind houses, afforestation, orchard inter-row weeding, and nurseries.
Herbicide Mechanism
Diquat is a bipyridine herbicide. After the agent is absorbed by the plant, it inhibits the electron transfer during photosynthesis of the weed leaves. The reduced bipyridine compound is quickly oxidized under light induction to form active hydrogen peroxide. This substance accumulates in large quantities in plant cells, destroys the plant cell membrane, and causes the leaves to wither and die in a short time.
Main features
(1) Broad spectrum of weed control: Diquat is a herbicide that kills most annual broadleaf weeds and some grass weeds, especially broadleaf weeds.
(2) Good rapidity: Diquat can generally show obvious poisoning symptoms on green plants within 2 to 3 hours after spraying, and is currently the fastest weed-killing herbicide.
(3) Low residue: Diquat can be strongly adsorbed by soil colloids, so once the agent comes into contact with the soil, it loses its activity and basically does not leave any residue in the soil, and has no residual toxicity to the next crop. Generally, the next crop can be sown 3 days after spraying.
(4) Short duration: Diquat is inactive when it encounters soil and only has an upward conduction effect in the plant body. Therefore, it has poor root control effect and a short duration, generally only about 20 days, and weeds are prone to recurrence and rebound.
(5) Very easy to degrade: Diquat is easier to photolyze than paraquat. Under strong sunlight, 80% of the diquat applied to the stems and leaves of plants can be photolyzed within 4 days. After one week, very little diquat remains in the plants. It loses its activity due to adsorption in the soil.
Usage tips
(1) Mixed use: Diquat has a poor effect on grass weeds. In plots with more grass weeds, it can be used together with clethodim, high-efficiency flupyralid, etc. to achieve better weed control and a weed control period of about 30 days.
(2) Time of use: Diquat should be applied in the morning after the dew evaporates. At noon, it is exposed to sunlight and has a significant contact killing effect, which is more effective. However, the weed control is not thorough. If it is used in the afternoon, the agent can be fully absorbed by the stems and leaves, and the weed control effect is better.
(3) Even spraying: Diquat is mainly used. When spraying diquat, it must be sprayed thoroughly and evenly. Penetrants such as silicone can also be added to ensure that the surface of the weed leaves is fully exposed to and absorbed by diquat, achieving a better weed control effect.
Instructions for use
(1) Weeding in non-arable land: For weeding in non-arable land such as those in front of and behind houses, barren hillsides, roads, railways, ditches, and nurseries, generally, when weeds are in the early seedling stage, use 300-400 ml/mu of 20% Diquat water-based agent, dilute with 15-20 kg of water and spray evenly.
(2) Weeding in orchards: For weeding between rows in orchards such as apples, citrus, pears, cherries, and grapes, when the weeds are small, use 200-300 ml of 20% Diquat water-based agent, dilute with 15-20 kg of water and spray evenly.
(3) Drying and defoliation: 6-8 days before the harvest of soybeans and potatoes, use 200-250 ml of 20% Diquat water-based agent per mu, dilute with 15 kg of water and spray evenly.
