Little chestnut. Hazelnut, also known as chestnut, chestnut or pestle, is a deciduous shrub or small tree of the genus Hazelnut in betulaceae, with a height of about 1 to 7m. The fruit of hazelnut is yellowish brown. The taste of this fruit is similar to that of small chestnuts, belonging to the genus Castanea in Fagaceae. Its main characteristics are high yield, high quality, disease resistance and insect resistance. It is mainly used for food, protection and wood. Its origin is the School of Forestry, Central South University of Forestry and Technology.