Contents

31 January 2020
Vol 367, Issue 6477

About The Cover

Cover image expansion

COVER Focus-stacked photograph of a Varroa mite on the abdomen of a honey bee. Varroa mites are major pests that weaken honey bee colonies by parasitizing bees and spreading viral disease. Researchers have genetically engineered bacterial gut symbionts of bees to kill these mites and boost bee resistance to RNA viruses, an approach that may eventually support honey bee health. See pages 504 and 573.
Image: Alexander Wild