Recently, Mr. Xin of Suichuan County, Mr. Wang of Xincai County, Mr. Zhao of Dianchi County and other readers dialed the Hotline 110 of the newspaper to consult about the issue of ginger borer. On this issue, the reporter interviewed experts from the expert advisory group of the newspaper. Experts pointed out that ginger atrophy, also known as ginger rot disease, generally reduces production by 20% to 30% after the onset of disease, and even causes greater losses to growers.
First, the harmful symptoms of ginger rickets mainly harm the roots and underground stems.
Rhizome infection, generally occurs in the base of the stem near the ground and adjacent roots, the initial occurrence of spotting stains, enlarged disease was pale brown, gradually lose luster of the epidermis, after the root tissue turns brown, later softening and rot, leaving only the epidermis The surface of the epidermis can overflow with white mucus, with a foul smell.
The aboveground part of the plant began to necrotic as a result of the internal tissues of the rhizomes, resulting in leaves withering, pale leaves, chlorotic curls on the leaf margins, and leaves detaching until the whole plant withered.
Ginger stored after harvesting can continue to be infected, the internal tissue becomes brown and rot, overflowing with off-white odor and mucus, and the spread is aggravated.
The disease is caused by the infestation of bacteria Pseudomonas gingivalis. Pathogenic bacteria in the diseased ginger species and with the remnants of diseased plants left over in the winter. Planting disease-prone ginger is the main primary source of infusion, and it is also an important way for germs to spread to distant areas of the new ginger area. When the environmental conditions are suitable, ginger is infected and transmitted through rainwater, irrigation water, etc. It is penetrated by the natural cracks or mechanical wounds of the plant roots and turmerics, spreads after the onset of the incubation, and undergoes multiple re-dyeing. The pathogen is hi-temperature and high-humidity environment, and the onset temperature range is 4°C to 40°C; the optimal onset environment is 5cm soil temperature 25°C to 28°C, and the soil moisture content is 30%. Both the whole growth period and the storage period can be susceptible to disease, and the incubation period is 5 to 10 days.
Second, prevention and control measures (A) choose to retain species. The disease-free ginger was selected and the disease-free seeds were planted and selected. After harvesting, the ginger is dehumidified in a ventilated place and heat-treated at 20° C. to 33° C. for 7 to 8 days to promote wound healing and then stored or refrigerated in an environment below 15° C. (b) Passage rotation. Onset field advocates two to three years of rotation with cruciferous and other vegetables to reduce the source of field bacteria. (c) Strengthen field management. Rational close planting, scientific fertilization, good drainage drainage system, no flood irrigation, to prevent water damage caused by rain. (D) clean up the pastoral. The diseased plants were found to be uprooted in time, and the diseased bodies were promptly removed after harvest, brought out of the field and buried deep or burned, and deep-spilled the soil to accelerate the decay of the diseased body. (e) Chemical control. At the beginning of the disease, start the medication and water the roots with 300 to 500 grams per hole. The agent can be selected from 30% DT wettable powder 1000 times, agricultural streptomycin sulfate 4000 times, 70% Dukesson wettable powder 1000 times and so on.
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