Which herbicides are prohibited for use on flowers, plants and nursery stock
Which herbicides are banned for use on flowers, plants and nursery stock
(Agricultural Wealth Network) Many herbicides are not suitable for use in gardens, flower nurseries and lawns.
1. Post-emergence herbicides for controlling broadleaf weeds. MCPA, 2,4-D, bentazone, dicamba, fluroxypyr, chlorimuron, and other such products must not be used in nurseries, gardens or Zoysia matrella lawns.
2. Post-emergence herbicides for controlling grass weeds. Post-emergence herbicides for grass weeds such as haloxyfop-R-methyl, fluazifop-P-butyl, quizalofop-P-ethyl, sethoxydim, clethodim and fenoxaprop-P-ethyl should not be used on grass-family lawns, because while controlling grass weeds, these herbicides also damage the lawn.
3. Herbicides with a long residual life. Sulfonylurea herbicides such as chlorsulfuron, metsulfuron-methyl, bensulfuron-methyl, pyrazosulfuron-ethyl, chlorimuron-ethyl, tribenuron-methyl and nicosulfuron; imidazolinone herbicides such as imazethapyr; and heterocyclic herbicides such as quinclorac and clomazone. These herbicides have too long a residual life in the soil. In nurseries where these herbicides have been used, flowers, plants and nursery stock planted even 3 years later may be harmed. Metsulfuron-methyl can cause damage to tall fescue lawns when sprayed, causing tall fescue to turn yellow and die. Clomazone can cause lawn plants to become albino.
4. Herbicides that have a toxic effect on the soil. Some herbicides of the amide, urea and triazine classes, as well as alachlor, acetochlor, fluometuron, metribuzin, simazine, atrazine, prometryn and monolinuron. If these herbicides are applied to lawns and then water accumulates, they affect the root system of lawn plants and thereby affect lawn plant development; where they are applied continuously, they cause deterioration and compaction of soil structure, affect the aeration of the soil around lawn plant roots, and subsequently cause lawn plants to turn yellow.
5. Herbicides with high toxicity or carcinogenicity. Sodium pentachlorophenol and paraquat are highly toxic and are absolutely prohibited in nurseries and lawns. Nitrofen has been banned in many countries because of carcinogenicity, and China has banned it since 2000. Alachlor has a carcinogenic effect on animals and is also unsuitable for use. Trifluralin has been banned in Europe because of carcinogenicity.
6. Herbicides with drift contamination. Dicamba, molinate and others have relatively serious drift contamination problems. Generally there are flowers, plants and nursery stock around lawns; spraying dicamba, molinate and other herbicides prone to drift on lawns will affect the growth of surrounding flowers, plants and nursery stock.
7. Herbicides with an off-odour. For example, the odour of MCPA is irritating to people, and after inhalation it affects the human stomach; it also causes phytotoxicity to nursery stock, so it is unsuitable for use.
8. Non-selective herbicides. Such as glyphosate (Roundup) and paraquat (Gramoxone). Although some nursery stock has a certain tolerance to low doses of glyphosate, sometimes the damage caused by glyphosate to nursery stock is difficult to judge clearly by visual inspection, and sometimes this damage is slow; in addition, drift is unavoidable when spraying glyphosate, which causes damage to surrounding sensitive flowers, plants and nursery stock.
In short, when choosing herbicides, in addition to considering the prevention of direct damage to flowers, plants, nursery stock and lawns, it is also necessary to prevent some potential, possible and hidden damage, so as not to cause irreparable injury to the yield, quality and surrounding environment of flowers, plants, nursery stock and lawns. In use, attention should be paid to selecting, according to different needs, varieties and periods, herbicides with a broad weed-killing spectrum, a moderate effective period, good eradication results and no pollution.
1. Post-emergence herbicides for controlling broadleaf weeds. MCPA, 2,4-D, bentazone, dicamba, fluroxypyr, chlorimuron, and other such products must not be used in nurseries, gardens or Zoysia matrella lawns.
2. Post-emergence herbicides for controlling grass weeds. Post-emergence herbicides for grass weeds such as haloxyfop-R-methyl, fluazifop-P-butyl, quizalofop-P-ethyl, sethoxydim, clethodim and fenoxaprop-P-ethyl should not be used on grass-family lawns, because while controlling grass weeds, these herbicides also damage the lawn.
3. Herbicides with a long residual life. Sulfonylurea herbicides such as chlorsulfuron, metsulfuron-methyl, bensulfuron-methyl, pyrazosulfuron-ethyl, chlorimuron-ethyl, tribenuron-methyl and nicosulfuron; imidazolinone herbicides such as imazethapyr; and heterocyclic herbicides such as quinclorac and clomazone. These herbicides have too long a residual life in the soil. In nurseries where these herbicides have been used, flowers, plants and nursery stock planted even 3 years later may be harmed. Metsulfuron-methyl can cause damage to tall fescue lawns when sprayed, causing tall fescue to turn yellow and die. Clomazone can cause lawn plants to become albino.
4. Herbicides that have a toxic effect on the soil. Some herbicides of the amide, urea and triazine classes, as well as alachlor, acetochlor, fluometuron, metribuzin, simazine, atrazine, prometryn and monolinuron. If these herbicides are applied to lawns and then water accumulates, they affect the root system of lawn plants and thereby affect lawn plant development; where they are applied continuously, they cause deterioration and compaction of soil structure, affect the aeration of the soil around lawn plant roots, and subsequently cause lawn plants to turn yellow.
5. Herbicides with high toxicity or carcinogenicity. Sodium pentachlorophenol and paraquat are highly toxic and are absolutely prohibited in nurseries and lawns. Nitrofen has been banned in many countries because of carcinogenicity, and China has banned it since 2000. Alachlor has a carcinogenic effect on animals and is also unsuitable for use. Trifluralin has been banned in Europe because of carcinogenicity.
6. Herbicides with drift contamination. Dicamba, molinate and others have relatively serious drift contamination problems. Generally there are flowers, plants and nursery stock around lawns; spraying dicamba, molinate and other herbicides prone to drift on lawns will affect the growth of surrounding flowers, plants and nursery stock.
7. Herbicides with an off-odour. For example, the odour of MCPA is irritating to people, and after inhalation it affects the human stomach; it also causes phytotoxicity to nursery stock, so it is unsuitable for use.
8. Non-selective herbicides. Such as glyphosate (Roundup) and paraquat (Gramoxone). Although some nursery stock has a certain tolerance to low doses of glyphosate, sometimes the damage caused by glyphosate to nursery stock is difficult to judge clearly by visual inspection, and sometimes this damage is slow; in addition, drift is unavoidable when spraying glyphosate, which causes damage to surrounding sensitive flowers, plants and nursery stock.
In short, when choosing herbicides, in addition to considering the prevention of direct damage to flowers, plants, nursery stock and lawns, it is also necessary to prevent some potential, possible and hidden damage, so as not to cause irreparable injury to the yield, quality and surrounding environment of flowers, plants, nursery stock and lawns. In use, attention should be paid to selecting, according to different needs, varieties and periods, herbicides with a broad weed-killing spectrum, a moderate effective period, good eradication results and no pollution.