Reported Resistance Case(s)

Species: psylla pyricola

Order	Family	Common Name(s)	Group	Host
homoptera	psyllidae	pear psylla	AG	pear

Active Ingredient: azinphos-methyl

MOA: Acetylcholine esterase inhibitors, Organophophates
Group: OP	CAS #: 86500	Shaugnessy Code: 58001

Resistance Case(s)

Case Id	Year of Report	Type of Resistance	Location	Reference
G4244	1984	Field Evolved Resistance	USA-- Utah	Davis, D.W. (1984). Personal communication.
G2613	1974	Field Evolved Resistance	USA-- Michigan	Howitt, A.J. (1974). Communication to FAO.
G2614	1974	Field Evolved Resistance	USA-- New England	Jensen, G.L. (1974). Communication to FAO.
G2046	1972	Field Evolved Resistance	USA-- Oregon	Westigard, P. H. and Zwick, R. W. (1972). The pear psylla in Oregon.. Oreg. State Univ. Agric. Stn. Tech. Bull. 122, 22 pp..
G932	1965	Field Evolved Resistance	Canada-- British Columbia	McMullen, R.C. (1965). In: FAO 1967.
G933	1965	Field Evolved Resistance	USA-- Washington	Harries, F. H. and Burts, E. C. (1965). Insecticide resistance in the pear psylla (P.. pyricola Forster.). J. Econ. Entomol., 58 172-73.

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