Remedial measures for yellowing and withered wheat leaves

Apply 70% isoproturon to wheat, and on the third day after treatment a cold wave hit; now the wheat leaves are yellowing and withering. Can it recover after some time, and are there any remedial measures?

Isoproturon reduces the cold resistance of wheat seedlings. If severe frost occurs after application, the seedlings are prone to frost damage, that is, “frost-herbicide injury”. After frost damage occurs, when the wheat seedlings are relatively tender and green or the damage is severe, the frostbitten parts first appear water-soaked like scalding by boiling water, then lose water, dry up and turn white; when the wheat seedlings are relatively old and sturdy or the damage is light, leaf yellowing symptoms mostly appear.

If the wheat seedlings in the above field show symptoms such as leaf yellowing, and this is caused by isoproturon “frost-herbicide injury”, the seedlings can recover later when the damage is light; when the damage is severe, especially when the seedlings are small, seedling death may occur. After wheat leaves are frostbitten, the leaves lose water quickly. If the field soil is dry, dry freezing is likely to occur, and seedling death becomes more serious. When the field soil is too dry, especially when the seedlings are small, after frost damage it is advisable to irrigate or water appropriately (do not irrigate or water when wheat leaves or the soil are frozen), or appropriately cover with straw and other materials for insulation, which helps preserve the seedlings.

At the same time, take measures such as supplementary fertilizer application according to the damage to the wheat seedlings in the field. If the damage to the wheat seedlings is not too severe, no special management and protection measures may be taken; if the frost damage is severe or even the seedling death rate is relatively high, appropriately apply supplementary fertilizer according to the previous fertilizer application situation to promote tillering and population recovery of the wheat seedlings, and if necessary spray humate foliar fertilizer and the like to promote recovery of the wheat seedlings. In places with many missing seedlings, around the 5-leaf stage of wheat, thin out seedlings from places with many seedlings to fill in the gaps.