Autumn tomatoes to prevent two diseases
ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztpipevalve.com
Viral disease High temperature and drought are the primary conditions for the onset of the disease. The appropriate onset temperature of viral disease is between 38 ° C and 43 ° C. Below 35 ° C or above 45 ° C is not conducive to disease occurrence. In the daily cultivation management, artificially controlling the temperature can be beneficial to avoid disadvantages. The specific measures are as follows:
Watering in time From the planting of the seedlings to the middle of the fruit setting, the surface of the shed should be kept moist. The surface water content should be no less than 75% to 80%, and the air humidity in the shed should not be less than 70%.
Temperature control Take the morning and evening to open the wind, open the wind at night (under the conditions of no rain at night), the management method of avoiding the wind at noon, especially when the light intensity is high at noon, it is better to avoid the wind early. The main purpose is to ensure that the air in the shed has a high water content, and reduce the evaporation of water, so as to ensure that the young leaves and growth points of the plants are not wilted due to the transpiration of water; the leaves of the plants on both sides of the tuyere are prevented from being sunburned by direct sunlight. The main methods are: (1) using hand pressure sprayer or motorized sprayer to carry out foliar spray hydration in time; (2) using sunshade net for physical control, generally pull the sunscreen net at 10 o'clock every morning, and uncover the light after 5 pm. Can effectively control the occurrence of viral diseases.
Chemical control In the early stage of the disease, use 1.5% phytopathogenic wettable powder 600-800 times in time. Or 20% virus A800 ~ 1000 times, or 60% virus king wettable powder 800 ~ 1000 times spray control, especially 60% virus king wettable powder on the control of disease occurrence and passivation of the virus effect is obvious and pollution-free.
Budding blight is a physiological disease that is greatly affected by the climate. High temperature and drought are the main factors. Symptoms are: growth point growth is significantly inhibited, spherical, under the first inflorescence, the leaves grow rapidly in the lateral direction, and the branches and leaves are hypertrophied.
Control methods: (1) Use shade nets to avoid strong light. The method is the same as the physical control method of viral disease; (2) The regulation method: using 920 growth regulator, one gram of water and 35 kg, the spray is quickly and evenly sprayed on the top of the plant, and the cure rate is over 95%.