Table 2. Mean pre-reproductive periods (± SEM) in days for adult females of three coccinellid species surviving two 24-h exposures to residues of copper sulfate and petroleum oil as larvae.

Species Control Treatment F df P Curinus coeruleus 22.2 ± 0.71 22.1 ± 0.69 0.020 1,36 0.888 Harmonia axyridis 16.0 ± 1.22 15.9 ± 0.92 0.005 1,46 0.941 Olla v-nigrum 12.2 ± 0.12 13.0 ± 0.36 5.533 1,53 0.023