Ricinus communis
The symptoms are also called stalk blight. The main damage stems. On the stem, there was a primary spindle-shaped dark brown lesion with a lighter middle, and the posterior disease minister had a number of small black spots, ie pathogenic conidia. In later stages, the diseased part is often shredded and damaged, bast fibers are exposed, and it is easy to fold. The pathogen Macrophoma abuti10mis Nakata et Takim said that the genus Stenospore is a fungus of the genus Deuteromycorrhizal fungi. The conidia are yellowish-brown spheroids, semi-buried under the epidermis, and are 125-150μm in size. Many oval-shaped conidia accumulate inside the device, and they overflow from the top of the orifice when they are wet. The conidia unit cells are colorless, size 15-17.56-9 (μm). Transmission Pathways and Pathogenic Conditions Germs and mycelia with diseased tissue remain on the soil surface for wintering, and when the temperature and humidity are suitable for the following year, the mature conidia escaping from the orifices of the conidia are abundant. Infected with initial infection and re-infestation, the planting density is too large and the low-lying and dampness of Ma Tian is easy to induce the disease, partial application, over-application of nitrogen fertilizer, promote the use of formula fertilization techniques, pay attention to increase phosphorus and potassium fertilizer. (2) At the beginning of the disease, spray 1:0.5:100 times Bordeaux fluid or 60% DTM WP 500 times, 14% urea bath 300 times, 60% WP 800 - 1000 times liquid, 36% thiophanate-methyl suspension 500 times.
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