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ECOLOGY AND POPULATION BIOLOGY Induced Plant Resistance and Susceptibility to Late-Season Herbivores
 

Summary: ECOLOGY AND POPULATION BIOLOGY
Induced Plant Resistance and Susceptibility to Late-Season Herbivores
of Wild Radish
ANURAG A. AGRAWAL AND MARGARET F. SHERRIFFS
Department of Botany, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
Ann. Entomol. Soc. Am. 94(1): 71Ð75 (2001)
ABSTRACT Wild radish is an annual plant that exhibits broad spectrum induced resistance to
herbivores. In two experiments, we placed potted plants [control, manually clipped, and damaged
byPierisrapae(L.)larvae]intheÞeldandassayedforovipositionbyP.rapae(aspecialistherbivore),
damage by ßea beetles (a specialist herbivore), and damage by rabbits (a generalist herbivore).
Induced responses attracted oviposition by P. rapae and increased damage by ßea beetles, while
having a minimal effect on rabbit herbivory. Plant families had different levels of resistance to
herbivory by rabbits and to oviposition by P. rapae, but not to herbivory by ßea beetles. Manual
clipping was a poor inducer of plant responses. Induced responses in wild radish can be a double-
edged sword, increasing herbivory by some herbivores under certain conditions, while reducing
herbivory by other herbivores.
KEY WORDS Raphanus raphanistrum, induced defense, plant-insect interactions, generalist ver-
sus specialist, trade-offs
MANY PLANTS ACTIVELY respond to herbivore damage by
producing chemicals or structures that reduce future

  

Source: Agrawal, Anurag - Department of Ecology and Evolutionary Biology & Entomollogy, Cornell University

 

Collections: Environmental Sciences and Ecology