Annotation: The most economically important part of the mulberry tree is the leaf, which is the silkworm's only food. Mulberry leaves contain nutrients that fully satisfy the needs of the silkworm - sugar, protein, fat, water, enzymes and various vitamins. As soon as the silkworm seed comes to life, it feeds on the mulberry leaf and eventually spins a cocoon. Therefore, the more mulberry leaves, the more worms can be fed and the more cocoons can be produced.