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Table 2 LD 50 calculation for the pesticidal activity using probit analysis

From: Pesticidal and pest repellency activities of rhizomes of Drynaria quercifolia (J. Smith) against Tribolium castaneum (Herbst)

Recording time

Dose (mg/cm2)

% of Average mortality

% Corrected mortality

Regression equation

LD50(mg/cm2)

95% Confidence limits

      

Lower

Upper

Record after 24 hours

1.77

96.66

97

Esimate 1

0.40

7.99

6.41

0.88

90.00

90

Y = 1.72 + 3.10X

0.44

53.33

53

Esimate 2

0.22

20.00

20

Y = 1.61 + 3.19X

Record after 48 hours

1.77

96.66

97

Esimate 1

0.37

7.33

15.65

0.88

90.00

90

Y = 1.93 + 2.97X

0.44

56.66

57

Esimate 2

 

0.22

23.33

23

Y = 1.88 + 3.02X