What is the fine-grained topic of the following text: Residual insecticides labelled for ‘beetles’ or ‘crawling insects’ and applied to crevices and entry points around buildings are likely to kill Harlequin ladybirds, but beware; native ladybird species may also be present in the same hibernation sites within buildings. Only return the topic.
Use and impact of residual insecticides on Harlequin and native ladybirds