Open AccessPyrethroid Resistance Increasing in Unsprayed Populations of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in New South Wales 1987–90
Author(s) -
GUNNING ROBIN V.
Publication year - 1994
Publication title -
australian journal of entomology
Language(s) - English
Resource type - Journals
eISSN - 1440-6055
pISSN - 1326-6756
DOI - 10.1111/j.1440-6055.1994.tb01255.x
Subject(s) - helicoverpa armigera , noctuidae , lepidoptera genitalia , biology , pyrethroid , resistance (ecology) , agronomy , horticulture , botany , pesticide
Pyrethroid 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.