Neem oil is an organic pesticide that is also effective against aphids and beetles, as well as leaf diseases such as mildew and rust. Chemical pesticides include malathion, carbaryl (Sevin) and acephate. You will need to look at the list of ingredients on pesticides to find many of these generic insecticide names.
Other summer insects include slugs, snails, thrips, earwigs and borers. Slugs and snails must be treated regularly or they eat holes in leaves of annual and perennial flowers and vegetables. They only feed at night so you seldom see any signs except holes and their slimy trails. Snail and slug bait lasts about a week and then must be reapplied. The most common slug baits contain Mesurol. However, baits with iron phosphate are safer for use around pets and wildlife.
Thrips are tiny insects that live inside flower buds. If you have flower buds that fail to open properly, shake a bud over white paper to reveal these long bodied insects. They are hard to reach with a spray. Spinosad is an organic systemic insecticide that will control them.
Earwigs also feed at night. Two of their favorite foods are flowers and corn silks. Earwigs are best controlled by earwig and cutworm bait.
Dead twigs and branches in woody plants may indicate borer damage. Borers eat the tissue under the bark. Cutting through the bark may reveal tiny tunnels. Spinosad also controls borers.