Determine what shape or image the reader will see first and make sure the main headline pairs that to make a coherent statement. The reader will look first at the largest image, then to big display type, to decide if the graphic is worth spending time with. If the link between the two is too obscure, the reader might lose patience and turn the page. It's much better to have a straightforward headline than one readers have to puzzle over. Good headlines may play on words or movie titles, etc., but not at the expense of clarity.
Specific headlines are more interesting and accessible.
That suggests you'll be giving mostly general information about termites. If a graphic presents a lot of complex data, a headline that helps the reader understand that data is helpful. That way, the reader doesn't have to study dozens of little dots to find trends. Moses leads seminars in design and graphics at Poynter and is a frequent speaker for design and journalism groups on typography, journalistic graphic design, visual editing and work relationships. Al's Friday Meeting Communication towers may be killing 40 million birds per year.