Affiliation:
1. UESB: Universidade Estadual do Sudoeste da Bahia
2. Universidade Estadual do Sudoeste da Bahia
3. UFV: Universidade Federal de Vicosa
4. UnB: Universidade de Brasilia
5. Bonfim Indústria e Comércio Ltda
Abstract
Abstract
Background: To control the boll weevil Anthonomus grandis grandis (Coleoptera: Curculionidae), a key pest of cotton in the Americas, insecticides have been intensively used to manage their populations, increasing selection pressure for resistant populations. Thus, this study aimed detect insecticide resistance and assess insecticide control failure likelihhod of boll weevil populations exposed to malathion, profenophos+cypermethrin, and fipronil insecticides.
Results: Twelve populations of the boll weevil were collected from commercial cotton fileds of the state of Bahia, northeastern Brazil. These populations were exposed to malathion, profenophos+cypermethrin mixture and fipronil, at their respective maximum label dose for field applications. Three replicates of ten adult beetles were exposed to the insecticides and mortality was recorded 24 hours after exposure to the insecticides. The control failure likelihood was determined after 48 hours. The highest median lethal times (LT50) were observed for malathion and the profenophos+cypermethrin mixture. Resistance to at least one insecticide was detected in 11 populations; three populations were resistant to malathion and profenophos+cypermethrin; seven were resistant to all insecticides used. The resistance levels were low (<10-fold) for the three insecticides. Among 12 populations tested, 58% exhibited significant risk of control failure for the insecticide’s malathion and to profenophos+cypermethrin. The insecticide fipronil was efficient for the control of the boll weevil in 83% of the populations.
Conclusion: The results confirm the significant risk of insecticide control failure in the boll weevil populations to the main compounds used in the region. Thus, proper insecticide resistance management plans are necessary for the boll weevil in the region, particularly for malathion and fipronil insecticides.
Publisher
Research Square Platform LLC
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