Fig. 2
Effective half-life of three treatments used under field conditions as estimated from larval survival rates. Regression analysis was used to calculate the effective half-life of the three treatments: fungus + neem oil (F + N); fungus alone (F); and neem oil alone (N). The horizontal line at 50% survival, which bisects the regression curves, was used to estimate half-life. The precise half-life was calculated by regression analysis and the values for Y and R2 and shown (insert)