| % | Frequencies | Sources of information |
| 9 | 9 | Agricultural extension |
| 5 | 5 | Plant protection |
| 1 | 1 | Farmers’ union |
| 16 | 16 | Friends |
| 69 | 69 | Pesticide dealers and companies |
| - | - | Research centers |
| 100 | 100 | Total |