What are the white particles artificially placed on the back of corn leaves?

Also known as corn, corn, corn, and corn

Corn belongs to the family of the family Gramineae, the genus Maize, and its scientific name is maize. Corn is commonly known as corn, corn, corn, and corn. Produced in Latin America along the Andes foothills in Mexico and Peru. After Columbus discovered the American continent, he brought corn to Spain on his second return trip (1499). With the development of the world's maritime industry, corn gradually spread to all parts of the world and became one of the most important food crops. Corn Photography_Vegetables_Biological World Corn is known as a longevity food. It is rich in protein, fat, vitamins, trace elements, cellulose and polysaccharides. It has great potential to develop high-nutrition and high biological functional foods.

Corn is not only the main source of human food, but also a popular health food. It often appears on the dining table and is popular in the European and American world, which was once known for its exquisite food. According to reports, former U.S. President Ronald Reagan had cornflakes porridge for breakfast every morning. [1]

Note: Corn is a common food crop, mainly produced in the north. There are two types: yellow corn and white corn. Yellow corn contains more vitamin A, which is very beneficial to human vision. . [2] Its nutritional value exceeds that of flour and rice. Regular consumption can prevent arteriosclerosis, cardiovascular and cerebrovascular diseases, cancer, hypercholesterolemia, hypertension and other diseases.