Across
- 2. chemical
- 6. annual
- 7. herbicide
- 8. integrated
- 9. environmental
- 10. biological
- 11. sanitation
- 13. quarantine
- 14. ephemeral
- 17. declared
- 19. seed
- 20. contact
Down
- 1. physical
- 3. translocated
- 4. biodiversity
- 5. vegetative
- 12. solarise
- 15. perennial
- 16. economic
- 18. cultural