PURPOSE: To reduce a cost and labor by evaporating and diffusing a foliar absorbent nutrients and insecticides having sublimatability in a vinyl house, etc., thereby absorbing the nutrients from the leaf surfaces of agricultural products and exterminating insect pests.

CONSTITUTION: Containers 4, 6 housing the growth agents 3 formed by mixing the foliar absorbent nutrients and the insecticides both having the sublimatability are hung or placed on shelves 7 in the vinyl house 1, etc., where the agricultural products 2 are planted. The foliar absorbent nutrients and the insecticides are evaporated and diffused into the air in the vinyl house 1, etc., by which the nutrients are absorbed from the leaf surfaces of the agricultural products 2 and the insect pests in the vinyl house 1 are exterminated.