Reported Resistance Case(s)

Species: tetranychus urticae

Order	Family	Common Name(s)	Group	Host
acari	tetranychidae	twospotted spider mite	AG	cotton, fruits, vegetables, walnut, ornamentals

Active Ingredient: permethrin

MOA: Sodium channel modulators, Pyrethroids, Pyrethrins, DDT
Group: PYR	CAS #: 52645-53-1	Shaugnessy Code: 109701

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G3397	1978	Field Evolved Resistance	USA-- California	Roush, R. T. and Hoy, M. A. (1978). Relative toxicity of permethrin to a predator, Metaseiulus occidentalis and its prey, Tetranychus urticae.. Environ. Entomol., 7 287-88.
G2361	1974	Field Evolved Resistance	United Kingdom	Cranham 1974b. (1974).

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