61.   Q. I know that insecticides should be applied when the insects are susceptible, but how do I find out when that is?

62.   Scientists are not sure whether the lack of fossils means that these insects were not abundant millions of years ago, or that they just do not preserve well.

63.   Searching for clues, I decided to scour the riffles to see what insects may be prevalent.

64.   Shields says that many winged insects are experts at using the wind to help them fly.

65.   Some homeowners with termites volunteer as trappers during swarm season, when the insects are dramatically visible.

66.   Spray carefully in the evening, when aphid-eating beneficial insects like ladybugs are least active.

67.   Such ignorance is surprising, he said, because insects are our neighbors and the largest group of species on the planet.

68.   Talk about ways in which insects are helpful, particularly about child-friendly bugs like ladybugs.

69.   That cockroaches are able to distinguish the difference is just another example of how much smarter insects are than us.

70.   That is precisely what has happened in the Western hemisphere, and among the people who know it best, this particular insect is a formidable foe.