| Class | Definition | Entry Number |
|---|---|---|
| Class 1 | Insecticides | 2075 |
| Class 2 | Herbicides | 1801 |
| Class 3 | Fungicides | 1537 |
| Class 4 | Plant growth regulators | 1335 |
| Class 5 | Acaricides | 882 |
| Class 6 | Rodenticides | 743 |
| Class 7 | Avicides | 479 |
| Class 8 | Nematicides | 408 |
| Class 9 | Bactericides | 327 |
| Class 10 | Synergists | 256 |
| Class 11 | Bird repellents | 228 |
| Class 12 | Miscellaneous | 226 |
| Class 13 | Algicides | 199 |
| Class 14 | Molluscicides | 169 |
| Class 15 | Insect attractants | 106 |
| Class 16 | Insect repellents | 78 |
| Class 17 | Antifeedants | 15 |
| Class 18 | Chemosterilants | 13 |
| Class 19 | Mammal repellents | 8 |
| Class 20 | Herbicide safeners | 7 |
| Class 21 | Plant activators | 5 |
| Class 22 | Mating disrupters | 4 |