From your picture, this insect on bamboo is called bamboo bee. Bamboo bees don't eat bamboo, they just nest in bamboo. The shape characteristics of bamboo bees are obvious, and we can easily identify them through these characteristics. The bamboo bee is blunt and round, with a body length of about 25mm, black, dense and soft black fluff, and compound eyes 1 pair. The antenna is slightly curved, and the chest and back are densely covered with yellow hair. The wings are purple-blue, the base is dark, the tip is shallow, and the whole wing is shining with golden brilliance. Three pairs of black and short feet.

Bamboo bees belong to beneficial insects and feed on pests that harm bamboo.