Control technology of leaf disease of ginger
发布时间:[2018-3-15 14:49:33] 浏览量:4541次
There are 4 diseases of ginger leaf disease: ginger leaf blight, ginger spot, ginger anthrax and ginger eye spot.
1. Disease type and diagnosis.
The ginger leaf blight. After the leaves were injured, the yellow brown spot was first produced in the disease area, and then gradually extended to the whole leaf. When the leaf was serious, the leaf became brown and withered. Disease often produces many small black points, which were a cystic disease.
The ginger spot disease. The infected leaves first appear white oval or irregular spots, middle gray white and brown edge, about the size of 2-5 mm. When wet spots grow on many scattered small black points, namely pycnidium. Dry disease of crack or perforation, if many spots connected, can make the blade part or all of the dry.
The ginger anthracnose. The infected leaves from the leaf tips and margins began to appear nearly circular or irregular shaped like wet green spots back, later connected into irregular shaped big spot, serious when can make the leaves dry up. When wet spots grow slightly rough black granules, namely conidia disc. The disease can also be harmful to the stem and leaf tip.
The formation of strip shaped lesions stems and leaves and shoots, long black small, serious when can make the leaves droop, but remain green.
The ginger eye spot. First, a brown dot is formed on the leaf, then it is extended to the shape of the shuttle shape, like the eye, so it is called the eye spot disease. The lesion was gray, brown edge shallow, lesion size is 5-10 mm x 3-4 mm, disease around the yellow halo obvious or not obvious, when humidity is big dark gray to black spots on both sides' mold shaped, namely the pathogen conidiophores and conidia.
Two. Condition of disease occurrence. All the above leaf diseases are caused by fungi. The pathogens are mostly overwintered with the somatic residues in the soil and spread through wind and rain, insects, or farming operations. High temperature and high humidity is favorable for the development of disease; continuous cropping, planting density, poor ventilation, the incidence of nitrogen fertilizer and plant growth; low viscosity, thin soil is favorable to the disease.
Three. Prevention and control technology.
The prevention and control of ginger leaf diseases should be based on agricultural control and chemical control mainly.
1, agricultural control: the cultivation and disease prevention to fertilizer and water management center. Promote the application of fully decomposed organic fertilizer, increase the application of phosphorus, potassium and organic fertilizer, to avoid applying or over applying nitrogen fertilizer. The amount of watering, timely cultivator earth, timely removal of weeds, reduce the humidity field. The illness can be implemented for more than 3 years the best rotation, rotation and grass or legume crops. The autumn and winter completely remove the debris field, the field after the onset of disease and timely removal of leaf buried or burned.
2, chemical prevention and control.
At the early stage of the disease began to spray chemical control, optional 70% wettable powder 1000 times liquid, or 75% chlorothalonil WP 800-1000 times liquid, or 30% copper oxychloride SC 300-400 times liquid, or 27% copper noble suspending agent diluted 600 times, or 50% speed Kelingke wet powder 1500 times liquid 50%, or benomyl WP 1000 times liquid, or 80% anthrax can be Fu WP 600-750 times liquid spray 1 times every 7-8 days later, 3-4 times. Notice that the above pesticides should be rotated in rotation.
