1.   Hanson anticipates ground spraying to kill adult mosquitoes by midweek.

2.   Aerial spraying to kill the larvae began on Friday.

3.   The two pieces of news prompted them to announce another round of extensive pesticide spraying to kill mosquitoes that carry the virus.

4.   Its appearance in the New York area last year was the first in the Western Hemisphere, prompting a massive campaign of aerial and ground spraying to kill mosquitoes.

5.   Its appearance in the New York area last year prompted a massive campaign of aerial and ground spraying to kill mosquitoes.