Journal
EXPERIMENTAL AND APPLIED ACAROLOGY
Volume 37, Issue 1-2, Pages 83-91Publisher
SPRINGER
DOI: 10.1007/s10493-005-1020-5
Keywords
genetics; mancozeb; resistance; selection; Typhlodromus pyri
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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 F-1 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.
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