Through comparing three chemical methods of controlling Japanese pine bast scale such as perforating on trunk,stem coating and spraying,this article considers that the method of perforating on trunk is simple,which has the advantages of not hurting natural enemies and beneficial insects,bringing little pollution to environment and it is not restricted by terrain.

Field efficacy of chloramine phosphorus by stem injection against Apriona germari

Studies of trunk injection fertilizing in pear trees;

The theories,injection apparatus,(characters),applications and key techniques with the techniques of trunk injection of chemicals were introduced in detail.

Trunk injection can add quickly the nourishment that the plants need urgently but get hardly from the soil or spraying, and have applied in some respects, and can decrease the environment pollution.