What are the common weeds in rapeseed cultivation?
What weeds occur in rapeseed cultivation? What herbicides can be used to control them? An introduction: I. Main weeds in rapeseed fields. Main weeds in dryland rapeseed: cleavers, corn spurry, speedwell, small goosefoot, flixweed, shepherd's purse, wallflower, Cardamine, bluegrass, wild oat, knotgrass, white campion, thistle, small bindweed, etc.
What weeds occur in rapeseed cultivation? What herbicides can be used to control them? An introductionI. Main weeds in rapeseed fields
Main weeds in dryland rapeseed:Cleavers, corn spurry, speedwell, small goosefoot, flixweed, shepherd's purse, wallflower, Cardamine, bluegrass, wild oat, knotgrass, white campion, thistle, small bindweed, etc.
Main weeds in paddy-field rapeseed:Polypogon fugax, cleavers, giant chickweed, bog chickweed, large vetch, bittercress, shepherd's purse, speedwell, Lapsana apogonoides, etc.
Weeds in spring-sown rapeseed fields:The main weeds include wild oat, goosefoot, knotgrass, sow thistle, large thistle, climbing knotweed, cleavers, creeping yellowcress, Elsholtzia, Galeopsis, amaranth, barnyardgrass, lightflower microphysa, horsetail, etc., with wild oat causing the most serious damage.
II. Weed control methods in rapeseed fields
1. Pre-emergence closed treatment method for seedbeds or direct-seeded fields:Because the period of weed damage is short and the rapeseed seedlings readily gain population dominance, it is only necessary to ensure the safe early growth of the seedlings. Therefore, 60% butachlor emulsifiable concentrate 75-120 ml, 50% thiobencarb emulsifiable concentrate 200-250 ml, or 48% alachlor emulsifiable concentrate 200-250 ml can be selected, mixed with 40-45 kg of water for manual spraying, and applied after sowing but before seedling emergence for control.
2. Chemical stubble-clearing method before sowing or transplanting:For no-till rapeseed, before sowing or transplanting, the weeds already germinated in the field after harvesting the previous crop, or regrown plants from the previous crop, should be controlled with a non-selective herbicide. 41% glyphosate aqueous solution 100-150 ml, or 20% Gramoxone (paraquat) emulsifiable concentrate 200-250 ml, or similar chemicals can be selected, mixed with 30 kg of water for manual spraying.
3. Soil treatment method at sowing or transplanting:For rapeseed fields dominated by grass weeds such as Alopecurus japonicus, 48% trifluralin emulsifiable concentrate 100-150 ml can be selected and applied 3-5 days before sowing or transplanting, incorporated into the soil; or 65% S-metolachlor 45-60 ml, 48% clomazone emulsifiable concentrate 50 ml, or 50% acetochlor emulsifiable concentrate 75-100 ml can be selected and applied after sowing but before seedling emergence in direct-seeded rapeseed, or before transplanting or the next day after transplanting. For rapeseed fields where grass weeds are mixed with broadleaf weeds such as giant chickweed, shepherd's purse, and mouse-ear chickweed, Dual or Command, or a mixture of pretilachlor and Command, can be selected and applied before sowing or transplanting.
4. Post-emergence foliar spray method:For rapeseed fields dominated by grass weeds, 10.8% haloxyfop-P-methyl 20-30 ml, 10% quizalofop emulsifiable concentrate 35-50 ml, 6.9% Whip (fenoxaprop-P-ethyl) emulsifiable concentrate 40-50 ml, etc. can be selected and applied before the weeds reach the 4-leaf stage.
For fields dominated by small vetch, flixweed, Lapsana apogonoides, hemistepta lyrata, wild geranium, etc., 50% Benazolin suspension concentrate 30-40 ml or 33% Stomp (pendimethalin) emulsifiable concentrate 50 ml per mu can be used, mixed with 40 kg of water for spraying, and applied in autumn and winter for control. For fields dominated by hard grass and bluegrass, 24% clethodim emulsifiable concentrate 20-30 ml per mu can be used, applied at the 3-4 leaf stage of the weeds.
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