| 1 | You don't have to spray every year. | |
| 2 | A cheaper method would be to spray seawater into the air from boats. | |
| 3 | The tractor had slowed down because of a vehicle spraying insecticide for mosquitoes. | |
| 4 | In areas where insecticide is not sprayed, mosquitoes without the resistance gene do better. | |
| 5 | Taking care to keep above the swarms, they spray with the wind. |