Abstract
To control pests in turf soil, it is important to make insecticides penetrate into soil. Insecticides cannot penetrate by themselves even if they are very abundant. We made some experiments to choose the best chemical to help insecticides penetrate out of over twenty surfactants at home and abroad.
1. Surfactants (0.5%) were added to MEP diluted to 1/500, When TSG-79AG, which was test, wasaadded, the insecticides in Bsoil layer (2cm-4cm) was 13.3 times as much as when nothing was added. When TSG-1402, which was second best, was added, it was 12.6 times. Most surfactants made the rate of penetration higher.
2. The mortality of the third-stage larvae (Anomala schorfeldti Ohaus) kept in B soil layer was only 14.3% ten days after spraying in case of no addition. But it was 93.3% in TSG-1402 spot and 90.0% in TSG79AG spot. So addition of surfactants was very effective.
3. When third-stage larvae were kept in sandy soil spots of MEP of various density, the mortality of the larvae in the sandy soil spots of over 0.6ppm density was 100% ten days after spraying.
4. When we measured penetration into cloth and surface tension of various Kinds of surfactants, TSG-7606 was the highest. TSG-1402, which had the highest penetration, was lower than TSG-7606. It seems that penetration into plants has nothing to do which penetration into soil.
5. When we measured the amount of the insecticide in B soil layer twenty-four hours, forty-eights hours, seventy-two hours after spraying respectively, it increased in order. It seems to gradually move down slowly with water.
