Annotation: It is known that the growth and development of worms and the degree of formation of silk in their bodies depends on the nutritional value of mulberry leaves, that is, the amount of protein, carbohydrates, vitamins, trace elements, water and other substances in them. Based on these features, the Silk Research Institute is the only scientific center for mulberry breeding in Central Asia, and more than 70 varieties of mulberry have been created by Uzbek breeders. Currently, 9 varieties are included in the State Register. The newly created selective varieties are distinguished by their adaptability to the severe continental natural-climate conditions of our region, resistance to winter frosts, and abundant leaf production..