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Table 3 Resistance ratio and control failure likelihood in boll weevil (Anthonomus grandis grandis) populations exposed to the malathion, profenophos + cypermethrin, and fipronil insecticides

From: Risk of control failure to insecticides malathion, profenophos + cypermethrin mixture, and fipronil in boll weevil (Coleoptera: Curculionidae) populations from Bahia, Brazil

Insecticide

Meso-region

County

Boll weevil code

RR (CI 95%)

Mortality [Control failure likelihood]/%

Malathion

West

Luís Eduardo Magalhães

LEM1

2.69 (2.40—2.68)

26.7 [62.5]*

Luís Eduardo Magalhães

LEM2

2.54 (3.03—3.39)

20.0 [12.5]*

Southwest

Bom Jesus da Lapa

BJL1

2.80 (2.60—3.01)

73.3 [8.3]*

Candiba

CAN1

1.85 (1.76—1.94)

30.0 [0.0]

Candiba

CAN2

3.21 (3.03—3.39)

20.0 [29.2]*

Guanambi

GBI1

2.60 (2.46—2.73)

10.0 [20.8]*

Palmas de Monte Alto

PMA1

1.77 (1.66—1.87)

46.7 [0.0]

Palmas de Monte Alto

PMA2

2.96 (2.75—3.17)

63.3 [20.8]*

Pindaí

PIN1

1.00 (1.00—1.00)

100.0 [0.0]

Pindaí

PIN2

2.30 (2.14—2.45)

43.3 [0.0]

Pindaí

PIN3

3.09 (2.88—3.30)

60.0 [33.3]*

Vitória da Conquista

VCA1

1.00 (1.00—1.00)

100.0 [0.0]

Profenofos + cypermethrin

West

Luís Eduardo Magalhães

LEM1

3.23 (3.05—3.41)

20.0 [37.5]*

Luís Eduardo Magalhães

LEM2

2.57 (2.44—2.71)

16.7 [33.0]*

Southwest

Bom Jesus da Lapa

BJL1

2.34 (2.18—2.50)

43.3 [0.0]

Candiba

CAN1

2.71 (2.56 – 2.84)

26.7 [66.7]*

Candiba

CAN2

1.73 (1.62—1.85)

53.3 [8.3]

Guanambi

GBI1

2.94 (2.73—3.15)

63.3 [20.8]*

Palmas de Monte High

PMA1

1.63 (1.51—1.76)

73.3 [0.0]

Palmas de Monte High

PMA2

2.93 (2.74—3.12)

43.3 [12.5]*

Pindaí

PIN1

1.63 (1.51—1.76)

73.3 [0.0]

Pindaí

PIN2

2.94 (2.74—3.14)

56.7 [20.8]*

Pindaí

PIN3

2.38 (2.21—2.54)

50.0 [12.5]*

Vitória da Conquista

VCA1

1.00 (1.00—1.00)

100.0 [0.0]

Fipronil

West

Luís Eduardo Magalhães

LEM1

2.54 (2.40—2.68)

16.7 [8.3]*

Luís Eduardo Magalhães

LEM2

2.54 (2.40—2.68)

16.7 [8.3]*

Southwest

Bom Jesus da Lapa

BJL1

1.73 (1.62—1.85)

53.3 [0.0]

Candiba

CAN1

1.58 (1.46—1.71)

83.3 [0.0]

Candiba

CAN2

1.00 (1.00—1.00)

100.0 [0.0]

Guanambi

GBI1

1.00 (1.00—1.00)

100.0 [0.0]

Palmas de Monte Alto

PMA1

1.58 (1.46—1.71)

83.3 [0.0]

Palmas de Monte Alto

PMA2

1.68 (1.56—1.80)

63.3 [0.0]

Pindaí

PIN1

1.00 (1.00—1.00)

100.0 [0.0]

Pindaí

PIN2

1.55 (1.42—1.68)

90.0 [0.0]

Pindaí

PIN3

1.00 (1.00—1.00)

100.0 [0.0]

Vitória da Conquista

VCA1

1.00 (1.00—1.00)

100.0 [0.0]

  1. CI 95% Confidence interval at 95% of probability, RR Resistance ratio (LT50 of the resistant population/LT50 of the susceptible population). *Mortalities followed by an asterisk are significantly inferior to the minimum efficacy limit of 80% (unilateral Z test with confidence level of 95% with correction for continuity and correction of Bonferroni; n = 120), according at the Brazilian Ministry of Agriculture (MAPA 1995)