QINGZHOU HUIHAI VEGETABLES CO.,LTD.

Ginger spot disease, also known as white star disease".

Symptoms: the disease mainly harmed leaves, smaller leaf lesion, early onset of negative was hygrophanous, positive white, prismatic or oblong, 2-5 mm long, central lesion easily rupture or perforation, severe lesions, clouds, photosynthesis, plant growth weakened or stop growing, the incidence was center.

Etiology and pathogenesis of the disease: the disease is caused by the infection of ginger spot fungus. In mid August at the beginning of center of diseased plants, then spread the whole field, 9 months late for the popular stage, end in late October, during this period, the average daily temperature high temperature above 30 degrees, the minimum temperature of 20 degrees Celsius, the highest temperature is the annual period; high rainfall, annual precipitation is the most concentrated period, high temperature and high humidity is the main reason of the disease occurs. In September 8, and the rain day, ginger to spot with the rain sputtering spread. In addition, a piece of ginger to the more fixed years of planting soil in the accumulation of a large number of bacteria source; single fertilizer, nitrogen fertilizer amount, phosphorus and potassium application is less, an important factor is the weak ability of plant disease resistance occurred.

Ginger spot disease occurred in the morning and evening with the occurrence of the early morning and evening. Flood season came early, ginger spot disease occurred early.

Prevention and treatment methods; the conditions to avoid continuous cropping, increasing the organic fertilizer and phosphorus and potassium fertilizer, strengthen the healthy seedling cultivation, improve plant disease resistance. A field survey found early strain in the early stage, 70% wettable powder and 75% chlorothalonil wettable powder mixture 600 times or 30% azoxystrobin 1000 times, 25% West Amie SC 1500 times liquid, or 30% Aimiao (benzoyl propiconazole EC *) 4000---5000 times liquid ethylicin 1500 times liquid spray, 50 kg per mu, focusing on the incidence of spray, spray again every 6-7 days, continuous control of 3-4, the control effect reached 80% above.