Survival after 3 d in clay and subsequent 7 days of re-hydration was compared between the field population (re-hydrated both in the field and in the laboratory) and the laboratory population (re-hydrated in the laboratory) by means of a Generalized Linear Model(GLM) with quasibinomial distribution and logit as link function.Quasibinomial model was used instead of binomial model as the number of replicates was different among treatments. The sameanalysis was used to compare clay moisture between laboratory and field bioassays. Statistical analyses were conducted using R3.0.1 (R Foundation for Statistical Computing).