- #1,786
turbo
Gold Member
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- 56
Until this year, I killed Japanese beetles whenever I saw them - actually not a real good idea. The trick is to look them over good before you kill them. If they have one or more white spots on their backs (usually up on the thorax), leave them alone. The white spots are the eggs of a parasitic fly. The adult flies visit flowers and eat nectar and pollen, but the maggots need a live host. This beetle has 6 eggs on it. Within a day, the maggots will hatch out and burrow into the beetle. The beetle, sensing the attack will drop to the ground and try to burrow in - that gives the maggots a nice safe place to develop. When they are ready to molt into the adult form, they will dig themselves out and starte eating and mating to produce the next generation of beetle-killing maggots. I'm a bit concerned about the maggots' viability in this case - I have never seen 6 eggs on one beetle, so I hope that's enough food for all of them.