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Diazinon is effective for control of soil insects such as scarabs larvae. However, sometimes it does not give an expected effect. This study deals with the difference in insecticidal activity of different formulations. Equal amount of the active ingredient was used in every formulation. To compare the penetrable activity of diazinon formulations, these were applied to turf, and the activity was tested by a new laboratory test method designed by us. This method does not destroy soil structure. Emulsifiable concentrate was the most active formulation. Wettable powder was less active than emulsibiable concentrate. Granule was found to have no penetrable activity, even when the soil was irrigated every day for a month. Field tests also led to the same result. These experiment proved that different formulations had different insecticidal activities against insects in deeper soil. The results suggest that the selection of suitable pesticide. formulation is of importance, and that the suitable screening method is required for the selection.

Difference in Insecticidal Activity among Formulations of Diazinon Applied to Turf