Symptoms also known as twisted leaf disease, double crown leaf spot disease. Seedlings, plants can be disease. Diseases at the seedling stage began to produce light green round to oblong lesions on the third and fourth leaves, and gradually expanded to irregular shaped lesions. The heart leaf curled dry, and severe seedlings twisted and deformed and died. At the jointing stage and heading stage, yellowish lesions were produced on the affected leaves and sheaths, and the upper black spots or painted black spots were found. The headings of the flag leaves couldn't be eared as "one stick of incense" shape. The initial phase was wrapped in white mycelia and the latter part. Spikelets or all appear black leathery, ie sclerotial conidia.
The pathogen, Dilophospora alopecuri (Fr.) Fr., said that it is a fungus of the subphylum Aspergillus spp. Synonyms D. graminis. Pathogens on the leaves and ears of the small black spots, the pathogen conidia, size 120 ~ 300μm, black. Conidia cylindrical to elliptic, unit cells colorless, with 0 to 3 membranes, size 8.5 ~ 161.6 ~ 2.5 (μm), both ends of each with 3 to 6 straight or bifurcated bristles, crown feathers shape. Conidial germination temperature 20 ~ 25 °C.
Transmission routes and pathogenic conditions The pathogens spread through wind and rain with mycelium on the sick body or with conidia attached to the seed for winter or summer. Those who damage the wheat ears are mainly transmitted by wheat worms, and pathogens often attach to the worms in the worms and carry them into wheat through nematodes. Therefore, there are curlers on the ear, which are usually also harmed by larvae, and wheat curl disease and nematode disease are mixed. However, in the field, it is also common to have the same strain of wired worm disease without curling disease, and some curl diseased plants and wireless worms.
Control methods (1) Seriously control wheat nematode disease. (2) Rotate with non-wheat crops. (3) Use disease-free seeds.
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