| Active Ingredient | Category |
| abamectin | ABM |
| acephate | OP |
| acetamiprid | NICO |
| acetamiprid | NICO |
| acrinathrin | PYR |
| alanycarb | CAR |
| aldicarb | CAR |
| aldrin | CYCLO |
| allethrin | PYR |
| allethrin-bio | PYR |
| allethrin-bio-S-cyclopentenyl | PYR |
| amidithion | OP |
| aminocarb | CAR |
| amitraz | FORM |
| azadirachtin | MISC |
| azamethiphos | OP |
| azinphos-ethyl | OP |
| azinphos-methyl | OP |
| azinphos-methyl + PBO | OP |
| azocyclotin | TIN |