Table 1 Estimates of pyrethroid (lambda-cyhalothrin) resistance among Aphis glycines at Iowa (Nashua and Sutherland) and Minnesota (MN1 and MN2) locations from leaf-dip bioassays, compared to susceptible controls from biotype 1 (SBA-ISU-B1) and biotype 3 (SBA-ISU-B3) specific laboratory colonies.

From: Association of voltage-gated sodium channel mutations with field-evolved pyrethroid resistant phenotypes in soybean aphid and genetic markers for their detection

Collection

Origin

n

LC50a

95% CIb

Slope

χ2c

df

RRd

SBA-ISU-B1

Laboratory

480

0.38d

0.29–0.46

2.51 ± 0.45

5.08

5

-

SBA-ISU-B3

Laboratory

540

0.43d

0.36–0.50

4.22 ± 0.98

7.27

6

1.16

SBA-MN1-2017

Field

540

18.33a

13.92–22.74

2.08 ± 0.404

6.53

6

48.23

SBA-MN2-2017

Field

480

14.66a

10.42–18.91

1.91 ± 0.412

9.96

5

38.57

SBA-Nashua-2018

Field

1080

6.19b

4.49–7.90

1.25 ± 0.13

18.00

6

16.28

SBA-Sutherland-2017

Field

540

1.51c

1.18–1.83

2.86 ± 0.48

10.60

6

3.94

  1. aLC50 values designated by different letters within a column are significantly different from each other through non‐overlap of 95% confidence intervals.
  2. bCI, confidence interval.
  3. cChi‐square testing linearity of concentration‐mortality responses.
  4. dResistance ratio (RR): LC50 of individual test population divided by LC50 of susceptible SBA-ISU-B1.
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