Table 4 Dose–effect relationship parameters and mean combination index (CI) values of the methoxyfenozide (M.)/spinetoram (Sp.) mixtures on laboratory (Susceptible) and resistant strains of S. littoralis.

From: Toxicity and biochemical impact of methoxyfenozide/spinetoram mixture on susceptible and methoxyfenozide-selected strains of Spodoptera littoralis (Lepidoptera: Noctuidae)

Mixtures

 

Dose–effect parameters

CI values

Strains

LC50

m

r

LC10

Graded symbols

LC50

Graded symbol

LC90

Graded symbols

M. + SP

SUS

0.046

1.29

0.98

0.10

 ++++

0.05

 +++++

0.03

 +++++

M. + SP

MS

62.32

1.16

0.96

0.15

 ++++

0.06

 +++++

0.02

 +++++

  1. The parameter m is the slope of the median-effect plot (which signifies the shape of dose–effect curve), and r is the linear correlation coefficient (which signifies the conformity of data to the mass-action law. LC 50 and m are used for calculating CI values, CI < 1, CI = 1, and CI > 1 indicate synergism, additive effect, and antagonism, respectively.LC10 LC25, and LC50 are the concentrations required to reach a response mortality of 10, 25, and 50%, respectively. Graded symbols (++ + ++) very strong potentiation, (++ ++) strong potentiation, (+++) potentiation, (++) moderate potentiation, (+) slight potentiation40,48.
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