Kidney bean seedlings "bad" response
Recently, vegetable growers have reported that when the bean stalks have just grown out of two leaves, the seedlings appear to be “burntâ€. After investigation, it is known that the bean seedlings “badly†are caused by the following reasons.
The first is a bacterial disease. The leaves of the seedlings are red-brown and ulcerous. Can be used 72% of agricultural streptomycin sulfate powder 3500 times spray, or 20% thiazole copper 2000 times spray control.
The second is whitefly, locust damage caused by bad head. In the heart of the leaves can be seen whitefly, aphids, available 3.3% Avi. bifentanyl EC 1500 times, or 10% nitenpyrazine 4000 times liquid spray.
The third reason is that due to low-temperature freezing damage, the leaves are curled inwards, white and dry, but not rotten. If the temperature is normal, you can recover quickly.
Fourth, due to low temperature, rain and sunshine, high humidity in the field, the young leaves of the seedlings are malnourished, grow slowly, and dwarf, but they will not rot. The roots of the seedlings are poor, with less white roots and dark roots. Drain the drains to reduce the soil moisture.
If it is a bacterial epidemic disease and there is a large amount of bad heads, spraying pesticides for prevention and treatment, and applying quick lime 75 kg/mu, then change the non-bean vegetable crops.
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