The thrip is another tiny insect which lives inside flower buds. If you have flower buds which fail to open properly, shake a bud over white paper to reveal these long bodied insects. They are hard to reach with a spray, so a systemic insecticide such as acephate or spinosad is needed to control them.
Slugs and snails must be retreated regularly or they eat holes in leaves. They only feed at night or in high moisture conditions, so you seldom see any signs except holes and their slimy trails. Snail and slug bait lasts about 2 weeks and then must be re-applied. The most common slug baits contain Mesurol. However, baits with iron phosphate are safer for use around pets and wildlife.
Earwigs with their rear end pincers look ferocious, although I have handled them and never received any injury. They also feed at night. Two of their favorite foods are flowers and corn silks. The earwig is best controlled by cutworm and earwig 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. Cyfluthrin, and Spinosad are two systemic chemicals which can be used to get inside tissue and kill borers.
You will need to look at the list of ingredients on pesticide labels to find generic insecticide names.