若何防治玉米顶尖糜烂病(国外英文资料).docVIP

如何防治玉米顶尖腐烂病(国外英文资料) How to control corn top rot The symptoms of the top rot disease are most obvious before and after the corn heading (from late July to early August), which can cause rapid onset of whole or part of the plant, resulting in serious loss of yield. Tenth pieces of 1, symptoms of severestrains and above the leaf browning, decay, adhesion can not be carried into cattle whip, some plant leaves by other packages will not be extended to form the arcuate form when curled up in the whip. After the dissection, the new leaves and the male ear which were not extracted were decomposed, and the rotten parts were more smelly. There were no brown lesions in the vascular bundles in the stalk anatomy. The symptoms can also be seen on plants in front of the big bell mouth. Light plant leaves whitening thinning, from tip to the edge of the dead, no smell, or only in the new leaf margin showed white, dead. 2, after survey of a number of plots in different regions of the findings: first, there are differences between the incidence of maize top rot severity cultivars, Zhengdan 958 and Xundan 20 was the most serious, is common. Second, low-lying, Yu Bi, soil, heavy land parcel serious onset. Third, the summer sown corn sowed early plots more seriously. Fourth, the early corn thrips and Swedish fly and other heavy insect heavy corn disease. Fifth, the outbreak of Corn Brown Spot and corn borer sprayed with fungicides and insecticides were less serious in big trumpet stage. 3. Analysis of the causes of the disease Preliminary isolation and identification of pathogenic bacteria. Corn top rot is caused by mixed infection of fungi and bacteria. The thrips, Swedish flies and other pests in the corn is generally heavy, caused by wound infection of pathogenic bacterium through channels. Start from the top, from the outside and inside by leaf anatomy found: in 69 strains of plants, thrips strain rate was 45%, amount of insects per plant ranged from 1 to 8, average 4.5 head: Dipter