1, head smut of corn, also known as black rice, grey bag and dumb corn. The pathogen is Rhizoctonia solani. You can eat it when it just happened and it hasn't cracked. It's delicious in miscellaneous sauce. This disease is a fungal disease, which can be aggravated by chlamydospores on the soil, organic fertilizers, diseased stems and seeds attached to winter, continuous cropping, application of organic fertilizers such as incomplete decomposition of cow dung, returning stems to the field immediately after harvesting and application of unsterilized seeds. The female ear is damaged by germs and becomes "black rice". The incidence rate is equal to the loss rate. Generally, it is about 5% in corn fields, and it is more than 20% in serious cases. The yield reduction is very serious.

This disease spreads all over the world. Head smut of maize is a soil-borne disease. When a certain number of bacteria are accumulated in the soil, even resistant varieties are easily infected by bacteria and get sick. It is suggested to rotate crops and dress seeds with chemicals.

Children call this "flame bag", "black rice" and "grey bag".

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