A genetic analysis of mancozeb resistance in Typhlodromus pyri (Acari: Phytoseiidae).
A field population of Typhlodromus pyri (Acari: Phytoseiidae) tolerant to mancozeb was selected in the laboratory. After 10 mancozeb selections the LC50 value for mancozeb was 73 times higher in the selected-10 strain compared to the standard susceptible strain. A genetic analysis using reciprocal crosses and backcrosses of female F1 progeny found no maternal effect. Resistance in the selected-10 strain was codominant in expression, dominance value was about -0.1. Backcrosses between F1 females and the susceptible strain indicate that the resistance to mancozeb could be principally conferred by a predominant gene, but additional factors would also be involved.
Auger
Philippe
P
ENSA-M/INRA, Unité d'Ecologie animale et de Zoologie agricole, Laboratoire d'Acarologie, 2, Place Pierre Viala, 34060 Montpellier cedex 01, France. auger@ensam.inra.fr
Bonafos
Romain
R
Kreiter
Serge
S
Delorme
Robert
R
D000818:Animals; D003433:Crosses, Genetic; D004351:Drug Resistance; D005260:Female; D005659:Fungicides, Industrial / Q000494:pharmacology*; D008297:Male; D008344:Maneb / Q000494:pharmacology*; D008925:Mites / Q000187:drug effects* / Q000235:genetics*; D012641:Selection, Genetic; D015038:Zineb / Q000494:pharmacology*
D005659:Fungicides, Industrial; D008344:Maneb; C013099:mancozeb; D015038:Zineb