Table 1. Concentration response of WCR-R, WCR-S, and reciprocal crosses of each WCR population to DvSnf7 dsRNA overlaid on artificial diet.

Population	N1	Slope ± SE	LC50 (95% FL)2	Resistance ratio3	χ24	p value5
WCR-S	105	1.39 ± 0.54	3.70 (0–15.8)	—	13.5 (11)	0.2616
WCR-R	253	NC6	>500	>130	—	—
WCR-S ♀ x WCR-R ♂	139	2.05 ± 0.61	1.48 (0.10–4.40)	0.40	9.2 (16)	0.9047
WCR-S ♂ x WCR-R ♀	254	3.26 ± 0.83	1.42 (0.56–2.66)	0.38	22.2 (28)	0.7734

¹Total number of insects over all concentrations.

²DvSnf7 dsRNA (ng / cm2) after 12 days.

³Resistance ratio was calculated as LC₅₀ value / LC₅₀ value of WCR-S.

⁴Likelihood Ratio Chi-Square value and the degrees of freedom.

⁵p value: Goodness-of-Fit test p value based on Likelihood Ratio test.

⁶Not calculated as LC₅₀ never reached 50%.