20 February 1998
Vol 279, Issue 5354

About The Cover

In a range of plants, herbivory can induce responses that defend against subsequent herbivore attack. Wild radish plants that were exposed to early-season herbivory by a caterpillar larva showed induced resistance that protected them from subsequent herbivory by phloem-feeding green peach aphids (on the cover), earwigs, and flea beetles. These plants also had reduced mortality and increased seed-set compared with uninduced control plants. See 1201. [Image: Jack Kelly Clark; courtesy of the University of California Statewide IPM Project]