Dr. Jay A. Rosenheim, Professor of Entomology, Department of Entomology and Nematology, UC Davis, e-mail: [email protected]

I have been a professor in the Department of Entomology and Nematology since 1990, working in agricultural entomology.  I am working to develop a new approach to IPM research that capitalizes on the vast amount of data that IPM consultants generate each year when they scout fields.  By harnessing those data and combining them with other key sources of information (packout; pesticide use; weather; plant nutrients; etc.), we can dramatically accelerate research in citrus IPM.  We call this “ecoinformatics”, and AAIE members have been the most important collaborators in making this approach.


“Using data from California citrus farms to better manage spring pests on oranges and mandarins”


Joining me in this talk are three members of the research team: Dr. Bodil Cass, postdoctoral researcher; Ms. Hanna Kahl, graduate student researcher; Tobias Mueller, Junior Specialist.  We are using a different approach to agricultural entomology research: using data from commercial citrus farms to try to solve problems on commercial citrus farms.  We have built a database with data contributed by cooperating citrus pest management consultants (data on pest densities) and cooperating citrus growers (data on harvest packout).  Analysis of the database has produced new insights into several citrus pests that can damage young fruit after petalfall.  Because the database analyses produce only correlative evidence, which is not fully definitive, we have run complementary manipulative experiments to test the database results.  We have four basic results: (1) pest management on mandarins is not the same as pest management on navels; we will need to adjust our management practices depending on exactly which Citrus species we are growing; (2) some mandarins have natural resistance to pests that chew into small fruit (e.g., katydids, earwigs); thus, katydids and earwigs are not pests on some mandarins; (3) earwigs appear to be more significant pests than has been appreciated on navels, generating damage that may be confused with katydid damage; and (4) the window of fruit susceptibility to citrus thrips may be longer post-petalfall than has been appreciated, and again different Citrus species vary in their susceptibility.