Reported Resistance Case(s)

Species: metaseiulus occidentalis

Order	Family	Common Name(s)	Group	Host
acari	phytoseiidae	western predatory mite	PAR	mites

Active Ingredient: tetrachlorvinphos Z-isomer

MOA: Acetylcholine esterase inhibitors, Organophophates
Group: OP	CAS #: 22248-79-9	Shaugnessy Code: 83702

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G1611	1970	Field Evolved Resistance	USA-- Utah	Croft, B. A. and Jeppson, L. R. (1970). Comparative studies on four strains of Typhlodroums occidentalis.. II. Laboratory toxicity of ten compounds common to apple pest control. J. Econ. Entomol., 63 1528-31.
G1612	1970	Field Evolved Resistance	USA-- Washington	Croft, B. A. and Jeppson, L. R. (1970). Comparative studies on four strains of Typhlodroums occidentalis.. II. Laboratory toxicity of ten compounds common to apple pest control. J. Econ. Entomol., 63 1528-31.

*The population was created solely by selection and/or genetic manipulation.
**The population was selected further in the laboratory after collection.