What are the reasons ginger seedlings turn yellow and grow weak after emergence?

Yellowing ginger leaves are a very common phenomenon. If a large area turns yellow, it may mean the ginger has a problem, and in severe cases it can cause a reduction in yield. So what are the reasons ginger seedlings turn yellow and grow weak after emergence?

1. What are the reasons for the yellowing and weak growth?

Yellowing ginger leaves may be caused by infection with ginger blast disease, which shows up as leaves that were fresh one day turning yellow and withered overnight, spreading widely and developing quickly. This is a fungal virus. It occurs because the organic fertilizer used was not fully decomposed, and during fermentation in the soil it produces ammonia gas, which causes the fungal virus to multiply in large numbers.

2. How should it be prevented and controlled?

1. Before sowing, plow the land deep and harrow it level, spray the soil with chloropicrin soil fumigant, then cover with plastic film to disinfect and kill the fungus. At temperatures above 20 degrees Celsius, the fungus can be eliminated in one week; if the temperature is low, about 2 weeks is enough.

2. If yellow leaf disease occurs during the growing period, it may also be because the film was removed too late; covering with film causes the soil temperature to become too high, making the ginger unable to adapt and die off. Ginger growers are reminded here to remove the film in time, and to do so on a cloudy afternoon.

3. Yellow leaf disease is most likely to occur during continuous rainy weather, because humid, high-temperature weather easily leads to rapid reproduction of bacterial viruses. Difenoconazole and carbendazim can be used for prevention and control.

4. After heavy rain, water will accumulate in the ginger field. If the standing water lasts more than 2 hours, it will damage the ginger roots and cause the whole plant to begin dying, with yellowing leaves appearing in the early stage. It is especially important to rake open the ridges in time and drain away the standing water.

After ginger emerges, if only a small amount turns yellow and grows weak, it is a normal phenomenon. If it happens over a large area, ginger growers must pay special attention, otherwise it will cause a reduction in yield. It is best to do a good job of prevention and control to avoid this situation.