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: methamidophos

MOA: Acetylcholine esterase inhibitors, Organophophates
Group: OP	CAS #: 10265926	Shaugnessy Code: 101201

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G2306	1974	Field Evolved Resistance	United Kingdom	Cranham, J. E. (1974). Resistance to organophosphates in red spider mite, Tetranychus urticae, from English hop gardens.. Ann. Appl. Biol., 78 99-111.
G2334	1974	Field Evolved Resistance	United Kingdom	Cranham, J. E. (1974). Resistance to organophosphates in red spider mite, Tetranychus urticae, from English hop gardens.. Ann. Appl. Biol., 78 99-111.

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