Coleomegilla maculata (DeGeer), a polyphagous lady beetle, is one of the most common predators in corn fields in the eastern United States. Previous work on C. maculata showed an oviposition preference for the weed Acalypha ostryaefolia Riddell (hophornbeam copperleaf), compared with three other weed species and corn. In a separate field study, we found far more C. maculata eggs on Abutilon theophrasti Medic (velvetleaf) than on eight other plant species. Here we report on studies designed to assess the potential roles that prey densities and weed attractiveness may play in the selection of oviposition sites by C. maculata. We also examined diurnal and nocturnal predation of C. maculata eggs on Zea mays L., A. ostryaefolia, A. theophrasti, and Amaranthus hybridus L. (pigweed). We found that C. maculata’s choice of plants on which to oviposit was not significantly influenced by the availability of potential prey on those plants. There was no difference in the number of C. maculata adults captured on sticky traps placed over preferred weeds, nonpreferred weeds, or bare soil, suggesting that oviposition choices are made after the beetles land on plants. Coleomegilla maculata egg clusters on A. theophrasti and A. ostryaefolia were preyed upon less frequently than clusters on A. hybridus and corn, indicating that A. theophrasti and A. ostryaefolia provide refuge from predation (including cannibalism) of C. maculata eggs. Unlike the other plant species tested, both A. theophrasti and A. ostryaefolia possess numerous glandular trichomes, which may reduce foraging activity of potential predators of C. maculata eggs on those plants.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.