Introduction to diquat
Diquat is a bipyridine-based 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 a 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-arable 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 being absorbed by plants, it inhibits the electron transfer during photosynthesis of 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, destroying the plant cell membrane and causing the leaves to turn yellow and die in a short period of time.
Main features
(1) Broad spectrum of weed control: Diquat is a herbicide that has a good killing effect on most annual broadleaf weeds and some grass weeds, especially broadleaf weeds.
(2) Good rapidity: Diquat can generally show obvious poisoning symptoms in green plants within 2 to 3 hours after spraying. It is currently the fastest herbicide variety to kill weeds.
(3) Low residue: Diquat can be strongly adsorbed by soil colloids. Therefore, once the agent comes into contact with the soil, it loses its activity and basically leaves no residue in the soil. There is 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 can only conduct upward in the plant body. Therefore, it has poor root control effect and a short duration, generally only about 20 days. Weeds are prone to recurrence and rebound.
(5) Very easy to degrade: Diquat is easier to photolyze than paraquat. Under strong sunlight, 80% of Diquat applied to plant stems and leaves can be photolyzed within 4 days. After a week, very little Diquat remains in the plant. It loses its activity due to adsorption in the soil.
Usage tips
(1) Combined use: Diquat has poor effect on grass weeds. In plots with more grass weeds, it can be used together with clethodim, high-efficiency flupyramide, etc. to achieve better weed control effect. The weed control period can reach about 30 days.
(2) Time of use: Diquat should be applied in the morning after the dew evaporates. It will be exposed to sunlight at noon, and the contact killing effect is obvious and the effect is faster. However, the weed control is not thorough. Use in the afternoon, the agent can be fully absorbed by the stems and leaves, and the weed control effect is better.
(3) Uniform spraying: Diquat is mainly used. When spraying Diquat, it must be sprayed thoroughly and evenly. You can also add penetrants such as silicone to ensure that the surface of the weed leaves is fully exposed to and absorbed by Diquat, achieving a better weed control effect.
Instructions
(1) Weeding in non-arable land: For weeding in non-arable land such as in front of and behind houses, barren hillsides, roads, railways, ditches, and nurseries, generally, when the weeds are in the seedling stage, use 20% Diquat water solution 300-400 ml/mu, add 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 20% Diquat water solution 200-300 ml, add 15-20 kg of water, and spray evenly.
(3) Accelerating withering and defoliation: 6 to 8 days before soybean and potato harvest, use 200 to 250 ml of 20% diquat aqueous solution per mu, add 15 kg of water and spray evenly.
