Among the problems occurring in the greenhouse cucumbers, more than half are physiological diseases caused by unfavorable environmental conditions. These diseases are not contagious. As long as a good condition for cucumber growth is created, the symptoms of the disease can be eliminated. There are many kinds of cucumber physiological diseases, common are:
I. Phytotoxicity of bactericides or foliar fertilizers may cause phytotoxicity when the sprayer is used at the beginning or at the end of the last time. The obvious symptom of phytotoxicity is the appearance of spots or necrosis on the leaves, and sometimes the edges of leaves are yellow or Necrosis occurs in the same leaf position. Some foliar fertilizers may contain hormonal drugs. After use, the leaves and faucets are twisted to one side, deformed or stem segments are not long. The first use of the drug should be used strictly according to the instructions; the second is to try not to use the drug with unknown ingredients; third is to avoid high-temperature medication; fourth is not to mix pesticides indiscriminately; fifth is to put half of the water into the barrel before adding the drug. Mix the drug and then fill the bucket.
Second, the middle and lower leaves of the white net edge to the symptoms of the beginning of the tip, and along the leaf veins to both sides of the development, when serious to the internal development of the leaves, the latter leaves the edge dry. This is due to magnesium deficiency caused by excess phosphorus or potassium in the soil or low ground temperature. Should pay attention to balanced fertilization, do not over-application of phosphorus and potassium fertilizers, but also add foliar magnesium fertilizer leaf foliar.
3. Physiological water filling occurs mainly in the front of the shed. Because of the high humidity in the air, moisture in the leaves is not transpiration, and water is continuously absorbed by the root pressure and the water is squeezed from the cytoplasm. Out, flooded with cells, showing obvious water immersion, the symptoms disappeared after the sun came out, the time is longer, the cells are often filled with water where the necrosis, the formation of white necrotic spots between the leaf veins. Pay attention to ventilation and try to reduce the air humidity in the shed.
4. Irregular yellowing spots on leaves or melons are severe. Yellow spots appear on the entire layer of melons, and melon strips are stiff. Irregular yellowing occurs in the middle of the leaves. Severe yellowing of the faucet, which is also due to the lack of phosphorus and potassium fertilizers and the formation of the symptoms of deficiency, can be poured empty water, so that excess phosphorus, potassium sink or inject a small amount of nitrogen fertilizer.
5. Cucumber “baffle disease†and “parachute†leaves occur at low temperature and low light, mostly in the middle and lower leaves. There are many bumpy and small bubbles appearing on the front of the leaves. Brown, thick and brittle leaves. This is mainly because the temperature changes drastically during the winter, especially in the afternoon when the temperature drops too fast, and the photosynthetic products in the leaves are too late to accumulate in the leaves. Should pay attention to strengthen the temperature management, so that the photosynthetic products in the leaves are successfully shipped. The shed film should also be wiped regularly to increase the temperature of the light. "Parachute" Ye Chang and "Bubble disease" occur at the same time, but also due to severe temperature changes, especially the formation of long-term low ground temperature. Management should increase the temperature as much as possible, especially the night temperature and the ground temperature.
Precursors NO
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