Induced sterility in female Glossina palpalis gambiensis mated with males that were irradiated as pupae with a single dose (110 Gy) or fractionated doses of 10 + 100 Gy and 50 + 60 Gy with 1-, 2- or 3-day intervals (D1, D2, D3). Females from the control group had mated with untreated fertile males. The boxplot shows the median and upper and lower quartiles. Dots represent experimental data.