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According to observations from the vehicle spore catcher, the investigation was combined with reference to the relevant information. The pathogenicity rule of Shigulina smut was as follows: The pathogens wintered in bulbs (projection buds), diseased plant residues, and soil in winter spores and became the second year of invasion. The source of the infection was transmitted through air rain, and it was repeatedly infested during the growing season.
When the winter sporophytes (thick cypresses) germinate, they first produce burdens, without segregation, and each cell of the burden produces directly 1 to 4 densulates, also known as sporiciuun, which is colorless and oblong. The buds germinate to produce mononuclear primary hyphae. The primary hyphae form a nuclear secondary hyphae through the nucleus and the dinuclear secondary hyphae invade from the young leaf stomata and the edge water hole, and can also directly invade. When the secondary hyphae invade, an appressorium is firstly generated, and the host epidermis is adsorbed, then an infection-infiltrated silk is generated and invades the epidermis. The mycelia spreads and grows in the host cell tissue, and nutrition is obtained from the host mesophyll cells.
A study of the spores captured by the spore-harvesting vehicle found that, under appropriate conditions, vegetative propagation of the secondary mycelia continues to produce spores, which spread through wind and rain and invade young leaves and petioles of Sagittaria. In the growth season of Sagittarius, the spores are produced many times and continue to cause repeated infections. In the later period of sexual reproduction, the "thick hengzi group", which was transformed into a mass with the nucleus of the binuclear cells, was the winter sporadium of the pathogen and became the second source of infection. There is no dormancy period in the thick pods, and when they are in suitable conditions of temperature and humidity, they germinate in the season and cause infection.
The Sagittaria will generally suffer from some diseases during the production process, among which smut is commonly known as bubble disease is a very common disease. This germ mainly invades the young leaves and leaves a good petiole, which in turn harms the bulbs. Sagittaria can be pathogenic from cotyledon to adult stage. When the general Sagittaria began to extract the Portuguese, it reached the peak of incidence.