Abstract
ABSTRACTPyrethroid resistance frequencies were determined in unsprayed Helicoverpa armigera populations collected at sites 300–400 km from northern NSW cotton growing areas. Results confirmed a gradual loss of pyrethroid susceptibility in the unsprayed populations. At the conclusion of the survey, the frequency of resistant H. armigera was greater than 50%. These resistance frequencies are very similar to those found in sprayed H. armigera populations from cotton areas. Untreated H. armigera obviously cannot greatly suppress resistance build‐up in cotton populations by supplying migrants from a susceptible gene pool. Resistant moths must readily disperse between sprayed and unsprayed areas.
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