Study design and statistical analysis
Randomized block design was used in semi-field studies
with two formulations in three concentration levels and their
control, each arranged in five replicates. Means of larval and
pupal densities in the five replicates were obtained after dipping
five times per each replicate. Regression relationship between
percentage reduction in larval and pupal density and posttreatment
days were plotted and time taken to give 50% and 80%
mortality (LT50 and LT80) calculated.