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: chlorpyrifos

MOA:	Acetylcholine esterase inhibitors, Organophophates
Group:	OP CAS #: 2921882 Shaugnessy Code: 59101

Resistance Case(s)

Case Id	Year of Report	Location	Reference
	2008	Belgium -- MR-VL	Khajehali, J., Van Leeuwen, T., Grispou, M., Morou, E., Alout, H., Weill, M., Tirry, L., Vontas, J., Tsagkarakou, A. (2010). Acetylcholinesterase point mutations in European strains of Tetranychus urticae (Acari: Tetranychidae) resistant to organophosphates. Pest Management Science, 66, 220-228.
	2008	Greece -- Athens -- ATHRos-Pm	Khajehali, J., Van Leeuwen, T., Grispou, M., Morou, E., Alout, H., Weill, M., Tirry, L., Vontas, J., Tsagkarakou, A. (2010). Acetylcholinesterase point mutations in European strains of Tetranychus urticae (Acari: Tetranychidae) resistant to organophosphates. Pest Management Science, 66, 220-228.
	2008	Netherlands -- SAMB	Khajehali, J., Van Leeuwen, T., Grispou, M., Morou, E., Alout, H., Weill, M., Tirry, L., Vontas, J., Tsagkarakou, A. (2010). Acetylcholinesterase point mutations in European strains of Tetranychus urticae (Acari: Tetranychidae) resistant to organophosphates. Pest Management Science, 66, 220-228.
	2008	Germany -- Berlin -- WI	Khajehali, J., Van Leeuwen, T., Grispou, M., Morou, E., Alout, H., Weill, M., Tirry, L., Vontas, J., Tsagkarakou, A. (2010). Acetylcholinesterase point mutations in European strains of Tetranychus urticae (Acari: Tetranychidae) resistant to organophosphates. Pest Management Science, 66, 220-228.
	2001	Brazil	Nauen, R., N. Stumpf, A. Elbert, C.P.W. Zebitz, and W. Kraus. (2001). Acaricide toxicity and resistance in larvae of different strains of Tetranychus urticae and Panonychus ulmi (Acari: Tetranychidae). Pest Manag Sci, 57, 253-261.
	2001	Germany	Nauen, R., N. Stumpf, A. Elbert, C.P.W. Zebitz, and W. Kraus. (2001). Acaricide toxicity and resistance in larvae of different strains of Tetranychus urticae and Panonychus ulmi (Acari: Tetranychidae). Pest Manag Sci, 57, 253-261.
	2001	USA	Nauen, R., N. Stumpf, A. Elbert, C.P.W. Zebitz, and W. Kraus. (2001). Acaricide toxicity and resistance in larvae of different strains of Tetranychus urticae and Panonychus ulmi (Acari: Tetranychidae). Pest Manag Sci, 57, 253-261.