1986 Fiscal Year Final Research Report Summary

Utilization of introduced phytoseiid mite for biological control of spider mite

Research Project

Project/Area Number	60480043
Research Category	Grant-in-Aid for General Scientific Research (B)
Allocation Type	Single-year Grants
Research Field	植物保護
Research Institution	Hokkaido University
Principal Investigator	MORI Hans Hokkaido University, Faculty of Agriculture Prof., 農学部, 教授 (10001398)
Project Period (FY)	1985 – 1986
Keywords	Introduced predator / 薬剤抵抗性カブリダニ
Research Abstract	Susceptibilities to five chemicals on two different strains of Phytoseiulus persimilis were compared. One was introduced from University of California, Riverside (UCR, susceptible), the other from Biologische Bundesanstalt fur Land- und Forst-wirtschaft, Institut fur biologische Shcadlingsbekampfung, Darmstadt, Federal Republic of Germany (DAS Strain), in 1984. Susceptibilities to fenitrothion, carbaryl and chinomethionat were low in the DAS strain. However, suseceptibility to acephate was the same and that to permethrin was very high in both strains. The effectiveness of P. persimilis, DAS strain as a predator of Tetranychus urticae was studied on the chemical sprayed greenhouse. Ecellent biological control of the two spotted spider mite was observed on the greenhouse cucumbers sprayed fenitrothion.