Reported Resistance Case(s)

Species: psylla pyricola

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

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
G3958	1981	Field Evolved Resistance	USA-- Oregon	Riedl, H., Westigard, P. H., Bethell, R. S. and Detar, J. E. (1981). Problems with chemical control of pear psylla.. Calif. Agric., 35 7-9.

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