Injurious Insects of Japanese Pine Mushroom (VIII). : Economic Effect from Application of Insecticide.

In the present paper the author discussed economically how to control the injurious insects of Japanese Pine Mushroom (Armillaria Matsutakei ITO et IMAI) by the several insecticides. The experiments were carried out at Bisei-cho, Okayama Prefecture in 1958. In this experiments the insecticides were DDT, EPN, dieldrin, aldrin, malathon (powder) and lindane (Fumigant). These insecticides were used singly or jointly to control the larvae of injurious Dipterous insects. All of them were recognized the fair effect. It may be concluded from the results of this experiment that the use of insecticide has economical advantages in the following conditions: (1) The effect of insect control by insecticide is over about 50%. (2) The hervest of mushroom becomes over 50 kg/ha. (8) The price of insecticide is less than about 3000 Yen/ha.