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The 15 million wasp eggs scattered across neighborhoods in Sacramento and San Luis Obispo counties represent a rare return to historical methods of pest control. Deployed last week, the eggs will soon give rise to tiny wasps (Trichogramma platneri), each no larger than a grain of rice. The stingerless species...

The 15 million wasp eggs scattered across neighborhoods in Sacramento and San Luis Obispo counties represent a rare return to historical methods of pest...