Causes of Yellowing Wheat Leaf Tips and How to Handle Them
SummaryFertilizer burn: fertilizing wheat at high concentration burns the leaves and causes yellowing, so the concentration should be controlled. Herbicide injury: misuse of herbicides, dichlorvos and similar chemicals can cause yellowing. Nutrient deficiency: a lack of trace elements can cause yellowing wheat leaf tips, so a moderate topdressing is needed. Water deficiency: if it is caused by drought, water reasonably. Freeze injury: a large day-night temperature difference can cause yellowing leaf tips. Yellow dwarf virus disease: pay attention to controlling aphids and choose varieties with good disease resistance. Overcrowded planting: photosynthesis will be affected, so plant at a reasonable density.
1. Fertilizer burn
When watering and fertilizing during the wheat flowering stage, some fertilizer sticks to the tip leaves of the young plants, and because the fertilizer concentration is too high, leaf burn occurs. If the yellowing tips of the wheat match the distribution pattern of fertilizer application in the field and appear after fertilizing, this situation should be considered.
Solution: Therefore, the amount of fertilizer used on wheat should strictly follow the concentration, and attention should be paid to the type of fertilizer and the timing of application.
2. Herbicide injury
Because of the misuse of herbicides, dichlorvos and similar chemicals, damage to wheat can also occur, and this type of chemical injury causes scorched spots to form on the wheat. To prevent chemical injury to wheat, the use of herbicides should be strictly controlled in terms of dosage, and broadleaf weed herbicides must not be used in wheat fields.
Solution: Once chemical injury occurs in wheat it is very troublesome, and there is almost no good remedy, so prevention is generally the main approach.
3. Nutrient deficiency
Copper deficiency in wheat and other causes lead to a lack of trace elements, which makes wheat leaf tips turn yellow.
Solution: When watering wheat, an appropriate amount of urea can be used for topdressing, and foliar fertilizers and similar products should be used in good time to increase the wheat's nutrition, but fertilization should be done at the proper stage and the fertilizer concentration should be strictly controlled to avoid fertilizer burn.
4. Water deficiency
Because of too little watering, or soil that struggles to retain water, or wheat being unable to absorb water normally, all kinds of drought can cause dehydration-related dry tips at the top of the wheat. This phenomenon is often accompanied by leaf curling and yellowing of the lower leaves.
Solution: When growing wheat, soil conditions should be chosen reasonably and watering should be done appropriately.
5. Freeze injury
If the wheat variety is overly sensitive to temperature, and it is combined with weather that has a large day-night temperature difference, yellowing of the tip leaves may occur. This situation can be judged according to the weather.
Solution: If the freeze injury is not especially serious, paclobutrazol wettable powder can be mixed with water and sprayed. If the wheat has already been killed by frost, the field should be plowed early and replanted with other crops.
6. Yellow dwarf virus disease
Spread by aphids, after wheat is infected with this disease, yellowing and drying begin at the leaf tips and continue until the lower leaves turn yellow.
Solution: 1. Varieties with relatively good local disease resistance and tolerance should be selected, and attention should be paid to properly controlling aphids; seed dressing can be carried out.
2. If it is confirmed that the yellowing wheat leaf tips are caused by yellow dwarf virus disease, wuyiencin can be used for control.
3. Weeds should be removed in good time. For winter wheat, sowing can be appropriately delayed; for spring wheat, all kinds of issues should be considered and sowing should be appropriately early; winter wheat can also use plastic film mulching.
7. Overcrowded planting
Overcrowded planting can affect the photosynthesis of wheat, and this cause can also lead to yellowing of the wheat tip leaves, so the wheat planting density should be appropriate.