During the rainy season, there is much rain and rainfall, and ginger is prone to root rot. At the early stage of disease, the tip and the leaf margin of the lower leaf turn yellow, then spread to the entire leaf, and gradually develop to the upper leaf until the whole plant yellows and wilt dies. The base of the diseased plant stem was rotted and rotted. The underground root tuber was examined for browning and roots were undeveloped. The biggest difference between this disease and Jiangyan is that it starts from the periphery of the base of the stem, and the ginger does not show flesh-colored necrosis, no rot, no odor.
The disease is a fungal disease (Jiangyan is a bacterial disease), soil-based, ginger block after the colonization of the temperature and humidity changes, even in rainy weather or flooding, easy to disease, heavy spasm, partial nitrogen fertilizer, low-lying weeds, weeds The incidence of heavy land was heavy.
Root rot of ginger is a soil-borne disease. After the onset of spraying, the effect of foliar spray is poor. It is advisable to apply the mixture by mixing soil and irrigating roots. At the beginning of the disease, it can be used to kill three thousand 46.1% copper hydroxide water dispersible granules 500 to 1000 times liquid or 75% chlorothalonil wettable powder 1000 times to irrigate the diseased plants, each irrigating liquid 100 to 150 ml, Irrigation once every 10 days, even irrigation 2 times. Three thousand 46.1% of copper hydroxide dispersible granules can be killed as copper preparations, and they can not be mixed with pesticides and chemical fertilizers to prevent phytotoxicity.
Prevention of ginger root rot should pay attention to the following points. (1) Choose pest-free, mildew-free ginger, soaking for every 100 kg of ginger with 50% carbendazim WP 200 grams of water plus 100 kg soaking, drying after 4 to 5 minutes to be sown. (2) Severely affected fields, with 70% thiophanate-methyl WP or 50% carbendazim WP or 50% enesulphonate wettable powder 1 to 1.5 kg per mu in the site preparation 30 kilograms of soil is applied. Lime disinfection in acid soils can prevent soil-borne diseases. (3) More than 2 years of rotation with grass crops. (4) The soil with good ginger and good air permeability can be used to make 2500 kg of soil miscellaneous fertilizer per mu, 1 kg of borax, 1.5 kg of zinc sulfate, and improve the soil.
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