The scientific name of Iris tectorum Waxim is also known as Iris tectorum. It is also known as the blue butterfly, pheasant seven, frog seven, shandong dog, cold water dan, and flat bamboo. Is an iridaceae family perennial herb. Rhizome medicine. With blood stasis, expelling wind and dampness, detoxification, consumer product and other functions. Most provinces and regions in the country are distributed.
Symptoms are also called eye patch. The main damage leaves, and sometimes also harm stems and flower buds. The leaves began to appear round brown spots, and then turned into a light yellow oval lesions, the final center was gray, dark brown edges, and water-like halo pattern, black spots on the lesions, serious illness Spot fusion, resulting in partial leaf tissue or dry leaves.
Heterosporium gracile Sacc. Hemorrhoids browning of the appendix is ​​called a fungus of the fungus Suberonia. Conidiophore brown, size 18-578-14 (μm). Conidiophore brown, cylindrical, with 1-8 membranes, size 40-60l5-21 (μm). The sexual state is Didymellina macrospora.
Transmission routes and pathogenic conditions The pathogens overwinter in the soil or on the sick and sick. Sprinkling of rain can cause stems near the ground to become infected, and calcium and phosphate fertilizers in the soil are susceptible to disease. Humidity, over dense planting, and continuous disease are serious.
Prevention methods (1) Strengthen management. In autumn and winter, the diseased body is removed in time to reduce the source of bacteria in the next year. In severe areas, avoid continuum, density appropriate, pay attention to ventilation, light, timely drainage after rain, to prevent moisture retention, the use of formula fertilization techniques, appropriate application of phosphate fertilizer and calcium fertilizer, improve host resistance to disease. (2) Early stage of onset of spraying 25% benomyl EC 800 times or 50% benomyl WP 1500 times, 36% thiophanate-methyl suspension 600 times, 50% carbendazim WP 800 Double fluid.
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