First, herbicides don't hurt for a long time.
Check that there are no pests and diseases. This is caused by drug damage. Wuji farmers consulted that after spraying herbicides on the stems and leaves after seedling, the corn turned yellow for a short time, and the height was less than half of that of normal plants. The way of topdressing phosphorus and potassium fertilizer didn't work, and the antidote used in serious fields didn't get better. It can be seen that the drug damage is more serious. The main cause of phytotoxicity is the high temperature and dry climate during the application of herbicides, which affects the degradation of corn. Corn is inhibited by herbicides and does not grow seedlings.
Rescue method: apply quick-acting nitrogen fertilizer to water once and spray it on the leaves, and use it twice, that is, Aiduo or Dayun-120+ micro-fertilizer (containing zinc)+1% urea solution for 7 days. Or green wind 95+ love more harvest, use antidote to promote growth.
Second, maize rough dwarf virus disease (or dwarf mosaic virus disease) is not long. According to the monitoring, the number of Laodelphax striatellus is more than normal, and the sowing period of corn is longer. At present, there are corn at various growth stages. Early sowing has been heading, and late sowing is generally in the trumpet stage, which provides a good living environment and virus transmission conditions for Laodelphax striatellus. According to the investigation, maize rough dwarf disease is serious in some counties of Xingtai, with the incidence rate of 3% ~ 5% in the field and 25% ~ 30% in the heavy field. In Chengde, dwarf mosaic virus disease occurred, and the incidence rate was as high as 35%. Rough dwarf plants are not short, and their leaves are dark green. However, the heart leaves of dwarf mosaic virus disease plants have yellow stripes and are not short. The occurrence of maize rough dwarf disease will not occur in the whole field, but there are many diseased plants near the roadside and the fields are uneven.
Rescue method: pull out the diseased strain to prevent later infection. For example, farmers in Gaocheng recently reported that the female ear of a farmer's early corn was short and the seeds were exposed, which was the disease of maize rough dwarf disease in the later stage of corn. In addition, in order to avoid virus disease when multiple cropping corn, virus A with 0.2% seed weight was used for coating. Corn 1 leaf 1 heart stage was controlled with 800 ~ 1000 times of 20% copper guanidinoacetate wettable powder and 500 times of 20% virus a wettable powder.