Petunia worms, also known as aspens, feed on pollen, young bark, shoots, leaves, roots, sap, fruits, fungi and other different habits. Flowering tenebrous species often feed on pollen. Gully tibia asphodel often feeds on young bark, shoots and leaves.

The larvae of the aspen moths eat tree trunks and branches, affecting the growth and development of the tree, weakening the tree, leading to the invasion of disease, but also easy to be broken by the wind. When the damage is severe, the whole plant dies, the wood is moth-eaten and loses its craft value. Tianniu is mainly a pest of woody plants, in the larval stage of the decay of tree trunks, branches and roots.

Some of the herbaceous plants, the larvae live in the stems or roots, such as chrysanthemum aspen, melon vine aspen. Individual species, such as the cotton capsule aspen, is harmful to the cotton capsule. There are also a few species where the larvae do not live in plant tissues but feed on the roots in the soil, such as the large-toothed and curved-toothed sawfly, grass asphodel, and so on.

Extended information:

Harm

The wood parasitized with aspen is made of wood, but also can go out and harm the debris. Beijing Xinhua bookstore storage and transportation company has a bundle of books, was invaded by a kind of aspen larvae, in the overlap of the five books, moth-eaten a pit. So the significance of Tianniu infestation is very significant, especially for fruit trees and forests, they are an extremely serious threat.

The aspen is a phytophagous insect, most of the harm to woody plants, such as pine, cypress, willow, elm, citrus, apple, peach and tea, etc., a part of the harm to herbaceous plants, such as cotton, wheat, maize, sorghum, sugarcane and hemp, etc.;

A few harm to timber, construction, houses and furniture, etc., is an important pest in forestry production, crop cultivation and construction of wood.