Symptoms mainly affect the ear. Ears with early onset were pale or straw-colored, and were infected within two weeks after silking. The ear turned grayish brown and the entire ear atrophied or rotted. The light or small ears are erect, when the ear and the inner or inner lobe are closely adhered, the mycelium grows and reproduces, and the black conidiospores are produced on the lobe, on the calyx, and on the edges of the grains in the later period. Device. The ear of the plant was infected at the late growth stage and the appearance was not obvious. Infestation begins at the base of the ear and extends upward from the spike. When peeling or threshing, it can be found that there is a layer of white mold between the grains, and the top has changed color.
The main damage ear. Early onset of the ear, the temporal lobe is pale or straw-colored and becomes infected within two weeks after silking. The ear turns grayish brown and the whole ear atrophies or...
pathogen
Diplodiazeae (Schw.) Lev. S. spores is a semi-chicken fungus. Synonyms Maydis(Berk.)Sacc. The pathogen produces a dense black sphere to conospheric conidia at the host epidermis, 350-500 μm in diameter. Conifers light brown, cylindrical or elliptic, with 1 diaphragm, twin cells, size 13-333-7(m); in the field, colorless transparent filamentous spores are sometimes seen. In addition, it has been reported that D.macrosporaEarle said that the large spore color of the second saturated D.frumentiE11. etEv. Dry spores are also known to cause similar lesions.
Transmission routes and conditions
The pathogens overwinter on diseased seeds or straw by means of confinement devices, and conidia propagate with the wind in the following year. When corn vomiting, the leaf sheath is loose, and the bacteria that fall into the leaf sheath directly or through the wound can invade directly from the base of the stem, adventitious buds, or the filaments and spikes of the stem. The bacteria can be transmitted long distances with seed transport. The temperature of pathogenic bacteria is 28-30°C. The conidial germination germination temperature of 20 °C. High temperature and rain are conducive to the infection and expansion of pathogens.
Control methods
1, preparatory. Avoid planting corn on low-lying and cold plots, and implement crop rotations such as legumes for more than 2-3 years. After the harvest, the diseased body and disease ear were removed in time to reduce the sources of overwintering bacteria.
2, selected varieties. According to local conditions, disease-resistant varieties were selected, and 50% carbendazim wettable powder plus new high-fat film dressing was used to repel insects in the ground, isolate virus infection, reduce disease incidence, and increase seed germination rate. Appropriate sowing, reasonable close planting.
3, balance water and fertilizer. Adding organic fertilizer, spraying a new high-fat film to enhance fertilizer efficiency; pay attention to irrigation and drainage, reduce field temperature, improve plant disease resistance; spraying splendid spike during booting stage, can strengthen crop physiology, improve pollination, grouting quality, increase Thousand grain weight.
4, exposure ear. After harvesting, the ear was soaked so that the moisture was controlled at 18% and the removed grain was kept below 15% in order to be safely stored. Http://
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