Jinhu County, Yinji Town, Wang Keyuan, December 28, 2015: Over 300 acres of wheat were planted on November 5th. More than 10 days ago, the wheat seedlings in some plots began to show chlorosis, yellowing, dehydration and dryness. Symptoms, such as the normal growth of the heart, yellowing and underdevelopment of the roots of the diseased plants, 60% of the seedlings in the field. Low-lying fields and fields with accumulated water occurred in the early days, and the young wheat was in the 3-leaf and 1-heart stage; the high-lying fields did not occur, and the young wheat was in the 5-leaf and 1-heart stage. Two and a half months ago, some 7.5% of zicillut dispersible granules were used for weed control per acre in some plots. However, the same problems occurred in plots that did not use pesticides, except that the fields where herbicides were applied had severe symptoms and no weeding was applied. The field plots of the agents are lighter. He asked how the wheat seedlings in these plots were remedied. The cold damage of wheat and the injury of herbicides all lead to the symptoms of dehydration, dryness and whiteness. According to the weather information, on December 15-18, 2015, cool weather occurred in Jinhu and other places. The minimum temperature dropped to -4°C and the maximum temperature was around 5°C. Before the low temperature hits, the temperature is higher for a long time, the minimum temperature is above 0°C, and the maximum temperature is above 8°C. Before and after December 18th, wheat began to show symptoms such as water loss, dryness, and whiteness. It was just after this low temperature that it suffered cold damage. Due to the high temperature before the low temperature comes, sudden encounter with cold wheat seedlings is susceptible to freezing. In November 2015, continuous wet and rainy weather occurred in our province. The affected plots were squatting on the terrain. During the rainfall, water accumulated in the fields. The wheat seedlings were easily affected by the waterlogging. The cold weather was more likely to be chilled in the low-temperature frost weather. Sulfisomamide is a stem and leaf treatment agent that can control wheat weeds, acorns, wild oats, barnyardgrass, leeks, and common weeds such as grass weeds and broad-leaved weeds. The drug is absorbed by weed leaves, leaf sheaths, stems and roots, accumulates at growth points, inhibits acetolactate synthase, fails to synthesize branched-chain amino acids, affects protein synthesis, affects weed cell division, and causes weeds to stop growing and yellowing. Then died. Dow Corning's 7.5% furfural water dispersible granules are registered for winter wheat stem and leaf spraying to control annual weeds. The recommended dosage per hectare is 10.55 to 14.06 grams, approximately 9.4 per acre. ~12.5 g. The activity of the drug is relatively high, and it is necessary to strictly follow the recommended dosage, application period and method, otherwise it is prone to phytotoxicity. The drug should not be applied before adverse weather such as low temperature frost (lowest temperature below 2°C), and should not be used in wheat fields suffering from smolt, frost damage, salt damage, disease, and malnutrition, and should not be flooded within 2 days before or after application. Produce phytotoxicity. In the above-mentioned plots, low temperature frost weather occurred about 2 days after the application of sulbacam, and the wheat seedlings were further damaged by herbicides after freezing injury, and yellowing and growth inhibition were observed. If there is no affected field where the herbicide is applied, if only the large leaves of the wheat seedling are frozen and the heart leaves grow normally, they can normally recover after a certain period of time, and no special measures are required to remedy the problem. Herbicide-applied plots were sprayed with humic acid foliar fertilizer on a victim wheat seedling or protected with 0.136% erythrochlorpyrifos wettable powder, which was conducive to the recovery of wheat seedlings.
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