Effects of soil type and moisture on emergence of tuber flea beetles, Epitrix Tuberis (Coleoptera: Chrysomelidae) from potato fields
AbstractThe numbers of adult tuber flea beetles, Epitrix tuberis Gentner, emerging from different soil types in the lower Fraser Valley of British Columbia were compared in 1987 and 1988. Over- wintered beetles (PI) were released at known densities onto caged Russet Burbank potato plants grown in soils with different inorganic, organic, and moisture characteristics. The time from the introduction of PI beetles in June to the mean initial emergence of first generation (FI) beetles ranged from 38 to 47.2 days during the two years of study. The female:male sex ratio of 2210 FI beetles was 1 :0.94, with a slight but significant bias in females early in the emergence period. Although significantly more FI beetles emerged from some highly organic soils than from some mineral soils in both years, inorganic, organic and moisture factors of the test sites did not correlate consistently with the emergence of FI beetles in time or numbers. FI emergence from mineral soils was never significantly greater than that from highly organic soils. This work indicates that the economic injury level derived from studies of PI beetles in highly organic soils could be applied to other soil types with minimal risk to potato crops.
LicenseAuthors who publish with the Journal of the Entomological Society of British Columbia agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).