Lhb. Kanga et al., PYRETHROID RESISTANCE IN FIELD-COLLECTED BOLL-WEEVILS FROM SOUTHEAST ARKANSAS IN 1994, The Southwestern entomologist, 20(3), 1995, pp. 247-253
An adult vial test was used to determine the responses to selected ins
ecticides of field-collected boil weevils from southeast Arkansas wher
e control difficulties with pyrethroid insecticides were reported in 1
994. Resistance ratios at LC(50) and LC(90) were 8-27 fold and 2-8 fol
d with the pyrethroids cyfluthrin and cypermethrin, respectively, in c
omparison to a laboratory reference strain. There was about 2-4 fold t
olerance to oxamyl, 0.2-1.4 fold tolerance to endosulfan, and 0.2 fold
tolerance to azinphosmethyl in field-collected boil weevils compared
to the reference strain. The high sensitivity of field boil weevils to
azinphosmethyl suggests that organophosphorus insecticides may be the
best choice in a boil weevil eradication program. These data in combi
nation with those published earlier validate the use of the adult vial
test to monitor insecticide resistance in the boil weevil and suggest
the test may be useful. in the eradication program.