Environmental reasons
Because the night temperature is too high, small temperature difference between day and night, excessive organic nutrient consumption, less photosynthetic product, root nutrition supply, root growth is slow, lead to nutrition supply shortage and yellow leaf.
Prevention and treatment: reduce the night temperature, widening keep in more than 10 degrees Celsius temperature gap between day and night, night temperature in 12 ~ 16 degrees Celsius, reduce consumption, promote accumulation of photosynthetic products.
Air pollution causes
Some farmers friends and the organic fertilizer or ammonia volatilization of applying not rotten eggplant leaf from down to up turn yellow.Is the use of smoke agent again the next day no ventilation in time after the discharge harmful gas can make the leaves turn yellow.
Prevention and treatment: timely ventilation discharge harmful gas, serious when watering.
Phytotoxicity causes
Serious pests, such as aphids, mealworms, starscream, thrips, spot hidden flies and other long-term governance, increase the drug concentration, leaves turn yellow.
Prevention and treatment: the correct use of pesticides, the best is according to the instructions for use.
Root injury
The rise of temperature in spring, the eggplant price is good, some farmers friends under price make eggplant more as a result, bear good fruit, excess water and fertilizer in soil solution concentration is too high, burning phenomenon such as root cause retting root, eggplant leaf is yellow at the bottom.
Prevention and treatment: reasonable fertilizer water, avoid by all means is too much.At the same time timely spraying zinc iron foliar fertilizer, prevent yellow leaves.
Trace elements is not reasonable
Manganese element can cause excessive leaves turn yellow, its symptoms to start veins become yellow, the leaves slowly turn yellow, serious when leaves fall off.
Prevention and treatment: don't spraying agent containing mancozeb on eggplant and bactericide containing manganese is too large.
