likn4468

Dr. Lisa Knolhoff

   
   Department of Entomology
 Phone:+49 (0)3641 57 1560Max Planck Institute for Chemical Ecology
 Fax:+49 (0)3641 57 1502Hans-Knöll-Straße 8
  emailD-07745 Jena

  Research    CV   Publications   Presentations      to staff list 

The diamondback moth (Plutella xylostella, Lepidoptera: Plutellidae) is a specialist on brassicaceous plants and besides being a major pest insect, is often studied in its relationship with these plants and their specific chemistry. It was therefore unexpected to find this insect infesting sugar snap peas (Pisum sativum, Fabaceae) in Kenya in 1999. Using colonies originating from that area in Kenya that are reared separately on both cabbage (Brassica oleracea, Brassicaceae) and pea, I have been studying the behavioral and genetic mechanisms behind this apparent host range expansion. Experiments on ovipositional choice show that females of the pea strain lay some eggs on pea, but there is still a strong preference for cabbage. Neonate choice appears to be a more important component to the host range expansion and is correlated to the ability to complete development on a particular host plant. The ability to survive to pupation on a diet of pea leaves seems likely due to a few dominant genes, and an AFLP (amplified fragment length polymorphism) analysis is currently underway to determine markers linked to survival and behavioral components thereof.


Publications

Fielden, L. J., Knolhoff, L. M., Villarreal, S. M., and Ryan, P. 2011. Underwater survival in the dog tick Dermacentor variabilis (Acari: Ixodidae). J. Insect Physiol. 57: 21-26.

Knolhoff, L. M., Glas, J. J., Spencer, J. L., and Berenbaum, M. R. 2010. Oviposition behaviors in relation to rotation resistance in the western corn rootworm. Environ. Entomol. 39: 1922-1928.

Knolhoff, L. M., Walden, K. K. O., Ratcliffe, S. T., Onstad, D. W., and Robertson H. M. 2010. Microarray analysis yields candidate markers for rotation resistance in the western corn rootworm beetle, Diabrotica virgifera virgifera. Evol. Appl. 3: 17-27.

Onstad, D. W. and Knolhoff, L. M. 2009. Finding the economics in economic entomology. J. Econ. Entomol. 102: 1-7.

Knolhoff, L. M. and Onstad, D. W. 2008. Resistance by Ectoparasites. In Insect Resistance Management: Biology, Economics, and Prediction. D. W. Onstad, ed. Academic Press, San Diego.

Onstad, D. W. and Knolhoff, L. M. 2008. Resistance to Crops. In Insect Resistance Management: Biology, Economics, and Prediction. D. W. Onstad, ed. Academic Press, San Diego.

Knolhoff, L. M., Onstad, D. W., Spencer, J. L., and Levine, E. 2006. Behavioral differences between rotation-resistant and wild-type western corn rootworm (Coleoptera: Chrysomelidae). Environ. Entomol. 35: 1049-1057.

last updated on 2011-06-14