Fig. 4

Efficacy of boosted SIT in suppressing Aedes albopictus population in La Vilavella (site 2) (Valencia, Spain) during a field trial from June to October 2021: relative density (\(\theta\))— fitted with a spatial Poisson model and probability of success (\(P\left( \theta \le 0.20 \right) \ge 0.95\)) for Aedes albopictus eggs (graphs a, b), and adults (graphs c, d). The observed relative density were the density observed in traps located in the treated site (\(n=35\) traps/collection day), divided by the expected density, i.e., the average observed density in the control site (\(n=20\)). The probability of success was the proportion of traps in La Vilavella (site 2) with a high probability (\(P \ge 0.95\)) that the actual relative density was 0.20 at the most.