Yellow leaves of ginger are a common phenomenon in the process of planting. As long as it does not occur in a large area, it will generally not affect plants. But if it happens in pieces, it will reduce production and even lead to the danger of no harvest. Generally, this situation may be caused by bacterial virus reproduction, which can be prevented by difenoconazole or carbendazim. At the same time, it is the most reliable to find the reasons and take precautions.

Reasons for the yellowing of ginger leaves ① Improper fertilization: The yellowing of ginger leaves may be caused by ginger fever, which shows that the first day or fresh leaves turn yellow after one night and spread widely and rapidly. This is a fungal virus, mostly because the organic fertilizer (farmyard manure) used is not completely decomposed, and ammonia gas produced by fermentation in the soil leads to a large number of fungal viruses.

② Inadequate land disinfection: Before sowing, the land should be plowed and raked, and at the same time, chlorinated soil fumigant should be sprayed on the soil, and then covered with film for disinfection to kill fungi. (The temperature above 20℃ can be eliminated in one week. )

(3) Uncovering the film in time: Yellow leaf disease occurred during the growth period, or it may be that the film was uncovered too late, and the film mulching led to the high soil, which led to the inadaptability of ginger and its death. (Tip: It is best to uncover the film in time and choose cloudy afternoon. )

(4) Weather factors: rainy weather is the high incidence period of yellow leaf disease, because wet and high temperature weather is the most likely to lead to the rapid propagation of bacterial viruses; At the same time, especially after the heavy rain, the root system of ginger was damaged because of poor drainage and long-term accumulation of water, and finally the whole plant died and the early leaves turned yellow. Therefore, it is necessary to check the combing drainage system at any time and arrange it in time when water accumulates.

At the same time, ginger has a long growth period and needs a lot of fertilizer. In addition to base fertilizer, topdressing is also very important. Topdressing in stages can meet its demand for growth nutrients. In the south of China, there is plenty of rain. In order to prevent nutrient leakage and loss, topdressing is generally used. The first time is seedling fertilizer, when Jiang Miao is 8~ 10 cm, human and animal manure is added, the second time is seedling fertilizer, and decomposed rapeseed cake fertilizer can be added in late June. For the third time, cooked vegetable cake fertilizer and ash fertilizer can be applied, and at the same time, pig manure in cowshed can be used to cover the soil to keep it moist; The fourth and fifth topdressing is Zhuangjiang fertilizer, which is applied in late July and late August respectively, which can greatly promote the rapid expansion of rhizomes. Generally, it is applied by human and animal urine, and nitrogen fertilizer can also be applied when it is yellow.

Summary: It should be noted that the concentration of fertilizer should not be too large, and it should not be poured on the leaves, so as not to burn the roots and Jiang Ye, which is one of the reasons why ginger leaves turn yellow.