What are the differences in the occurrence of three smut diseases in wheat? The three smut diseases in wheat are significantly different in their occurrence.
(1) Wheat black stalk: When the wheat is harvested, the granules fall into the field or the wheat is threshed and the spores of the stalks adhere to the appearance of the tassels. After the autumn sowing, the wheat seeds germinate and the germs germinate, and the germs invade from the sprouts of the wheat sprouts and reach the growth point. In the spring of the second year, when the wheat is booting, the germs invade the ovary, destroying the seeds, and the seeds are all turned into black powder.
(2) Wheat smut: When the wheat is flowering, the spores of the disease are transmitted to the stigma of the healthy plant by the wind, and the spores germinate and invade the ovary. When the wheat matures, the dormant hyphae sleep in the embryo. In the autumn, the seed of the disease is germinated, and the germs in the embryo begin to germinate and reach the growth point. In the spring of the second year, when the wheat was booting, the germ spreads rapidly to the wheat ear, and the wheat spikes all become black powder except the cob.
(3) Wheat smut smut: In the late stage of wheat growth, as the diseased plant dies, the spores of the pathogen fall into the soil, or the threshing of the field will stain the surface of the seed. After the wheat is sown, the wheat germinates, and the pathogens in the soil or outside the seed also germinate and invade the interior from the bud sheath of the wheat sprout. In the spring of the next year, as the wheat grows and develops, it enters the leaves, sheaths and stems to form silver-gray stripes, and the pathogen forms black powder under the epidermis of the diseased tissue.
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