Symptoms and treatment of ginger spot disease

Ginger spot disease is also called "white star disease".

Symptoms: The disease mainly damages the leaves, and the lesions are small. In the early stage of disease, the leaves are water-stained on the reverse side. The front surface is yellow-white, prismatic or oblong, and is 2-5 mm long. The middle of the lesion is easily broken or perforated. , Dense spots, affecting photosynthesis, plant growth weakened or stop growing, the incidence of obvious.

Causes and causes of the disease: The disease is caused by the infection of P. gingivalis. In mid-August, we saw the central diseased plant and then spread throughout the whole area. In mid-to late September, it was the most prosperous period, and the end was in late October. During this period, the average daily temperature was high, the temperature reached above 30°C, and the minimum temperature was about 20°C. The year when the temperature is highest; rainfall is large, it is the most concentrated period of precipitation throughout the year, high temperature and high humidity is the main reason for the disease. In August and September, it was raining more and more conducive to the spread of ginger spotted disease by rain splashing. In addition, ginger seeds are relatively fixed, and after years of planting, soil has accumulated a large number of bacterial sources; single fertilizer, excessive nitrogen fertilizer input, phosphorus and potassium fertilizer application is less, weak resistance to plants is also an important factor in the occurrence of this disease.

The sooner or later of the occurrence of ginger spotting is related to the appearance of the early or late flood season. As early as the flood season comes, ginger spotting occurs early.

Control methods; conditional to avoid continuous cropping, increase organic fertilizer and phosphorus and potassium fertilizers, strengthen seedling cultivation, improve plant disease resistance. Do a good job in the field investigation and early detection of diseased plants. In the initial stage of disease, use 70% thiophanate-methyl WP and 75% chlorothalonil WP to mix 600 times solution or 30% azoxystrobin in 1000 times, 25% Micida suspension agent 1500 times, or 30% love Miao (benzoic acid * propiconazole) EC 4000 - 5000 times solution, I-Allicin 1500 times spray, 50 kg per mu solution, focus on the center of the disease The spray is sprayed once every 6-7 days, and it is controlled 3-4 times in a row, and the control effect is over 80%.

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