TABLE 4.

Estimation of h^2a of resistance from laboratory selection of the Melaka population of P. xylostella with Cry1Ac, Cry1Ab, B. thuringiensis subsp. kurstaki, and B. thuringiensis subsp. aizawai (F₄ to F₈) and reselection of Cry1Ac-SEL population with Cry1Ac (F₉ to F₁₃)

Strain	Estimate of mean response/generationb			pd	Estimate of mean selection difference/generation					h2h
	Initial LC50	Final LC50	Rc		ie	Initial slope	Final slope	ςpf	Sg
Cry1Ac-SEL	0.573 (−0.241)	>20 (>1.30)j	0.308	25	1.271	1.33	1.45	0.719	0.913	0.34i
Cry1Ac-SEL F15	0.573 (−0.241)	293 (2.47)	0.301	21	1.372	1.33	2.30	0.551	0.756	0.40
Cry1Ab-SEL	0.509 (−0.293)	2.13 (0.327)	0.124	34	1.078	1.32	3.51	0.414	0.446	0.28
B. thuringiensis subsp. kurstaki-SEL	2.183 (0.339)	6.02 (0.78)	0.088	34	1.078	0.89	3.81	0.426	0.459	0.19
B. thuringiensis subsp. aizawai-SEL	0.356 (−0.449)	0.68 (−0.17)	0.056	41	0.948	4.50	2.56	0.283	0.268	0.21

^aReference 52. 

^bInitial and final LC₅₀s were determined at F₃ and F₉, respectively (for Cry1Ac-SEL F₁₅, initial and final LC₅₀s were determined at F₃ and F₁₅, respectively). 

^cResponse to selection (R) = log (final LC₅₀) − log (initial LC₅₀)/n. 

^dPercentage of the population with values above the selection threshold (percentage surviving selection). 

^eIntensity of selection (11). 

^fPhenotypic deviation [0.5 (initial slope + final slope)]⁻¹. 

^gSelection differential (difference in mean phenotype between selected parents and entire parental generation, s = iς_p). 

^hh² = R/S. 

ⁱApproximately calculated, as LC₅₀ is approximated (Table 3). 

^jLog of LC₅₀s.