Usage: hang one for every 25 square meters. The height is slightly higher than the crop 10cm-15cm, which can be increased by sticky card with the height of the crop. When the crop reaches a certain height, sticky card can be hung in the most dense place of flying insects in the crop gap, and can be increased or decreased according to the degree of pests. The principle is to stick all pests, and the storage temperature is not more than 50 degrees Celsius.