There are insects that ends up beneficial to your garden or lawn, all the while some can be eating your plants or may give you potential health problems. To prevent these kind of species, you must first prevent attracting them. Plant species that are native to your place. To avoid mosquitoes, avoid water pooling in your garden or lawn. Call an exterminator to spray your lawn or plants. House geckos can be helpful too, they go after insects and mosquitoes.