Does herbicide affect fruit trees?

Herbicides have an effect on fruit trees, but as long as they master the method of use, they will not have much effect. In general, before the use of herbicides, you can spray some lime water, green protection, film-forming agents on the trees, which can effectively reduce the effect of herbicides on fruit trees.

What are the herbicides that do not harm fruit trees?

1. Herbicides for stem and leaf treatment

After the emergence of weeds, the herbicides that are directly applied to the stems and leaves of weeds to kill weeds are called stem and leaf treatment herbicides, such as glyphosate, 2.4 D butyl ester, paraquat, bentazone, etc., stem and leaf treatment, that is, the herbicides are diluted in a certain amount of water, and weed seedlings are sprayed to eliminate weeds through the absorption and transmission of drugs by weed stems and leaves. The control effect of stem and leaf treatment agent is closely related to temperature, light and wetting condition of herbicide on plant surface.

2. Soil sealing treatment agent

That is, the herbicide is sprinkled on the surface of the soil or mixed with the herbicide into the soil to establish a herbicide sealing layer to kill the germinating weeds. These herbicides can be absorbed by the roots, coleoptiles or hypocotyls of weeds. For example, isoproturon, Acetochlor and chlorotoluron all belong to this category. According to the time of application, these herbicides can be divided into two types: pre-sowing treatment and post-sowing pre-seedling treatment. The former refers to the closed treatment of the soil before sowing, in order to absorb the young roots and buds of weeds, and to prevent or reduce the volatilization and photolysis loss of herbicides. The latter carries out soil treatment before emergence after sowing. This method is mainly used for herbicides which are easily absorbed and transmitted upward by weed coleoptiles and young leaves, and are safe and harmless to the buds of seedlings.

3. Selective herbicides

Herbicides that can kill weeds without harming crops are called selective herbicides, which sometimes only kill one or a certain type of plants in pastoral weeds and have little effect on artificially planted plants in pastoral nurseries. If the cover grass can or steadily be used in the nursery, it can only kill the monocotyledonous weeds, but not the seedlings. Duer, Jingshu can be used in the seedling stage of weeds, as long as the concentration is appropriate, it is relatively safe for seedlings and other crops. Of course, the selectivity of herbicides is relative, and selective herbicides can also be used as non-selective herbicides when the dosage, application period and application method are changed. non-selective herbicides can also be safely used during the growth period of seedling crops through "jet lag selection" and "position difference selection".

4. Sterilized herbicides

Inactive herbicides, also known as non-selective herbicides, do no selective damage to plants, regardless of grass seedlings, and can kill weeds and crops at the same time. Glyphosate, gram without trace, farmer music and so on all belong to this category. This kind of herbicide is mostly used in tea mulberry, orchard, coffee, rubber and other cash crops to control weeds. Glyphosate and glyphosate are broad-spectrum biodegradable herbicides, which can quickly destroy the green tissue of plants and have no killing effect on the trunk and stem of non-green parts. Nongle is a newly developed one with strong sterilization and no residue, which can be directly used in ponds, lakes and other water surfaces to control all kinds of weeds and wet weeds. It is used for all kinds of orchards, mulberry gardens, tea gardens, etc., and can be used for weeding in industrial and mining areas, warehouses, roads and urban and rural areas. The method of smearing can also be used to remove the non-ornamental weeds in lawns and garden scenic spots. Contact herbicide: after contact with plants, this kind of herbicide is difficult to transmit or move poorly in the plant, and is limited to the damage to the contact area of the herbicide. This local contact effect is to cause the death of weeds, such as herbicide, paraquat, paspalum and so on. The application of this kind of herbicide should be uniform, and the control of perennial root weeds can be killed many times.

5. Conductive herbicides

These herbicides can be absorbed by roots, stems, leaves, coleoptiles and other parts of plants, and can be transmitted in the body of plants. Therefore, conductive herbicides are also called internal absorption herbicides, such as glyphosate, 2.4 Mel D, dimethyltetrachloride, chlorosulfuron and other herbicides. Glyphosate can kill weeds because the solution is absorbed from the leaves and then transmitted to the roots, causing the weeds to die slowly.

The above is the introduction of the effect of herbicides on fruit trees. I hope it will be helpful to you.