Jacobs Journal of Agriculture

Abundance of Liriomyza trifolii (Diptera: Agromyzidae) and its Parasitoids on Five Vegetable Crops in Southern Florida

Published on: 2018-07-26

Abstract

In southern Florida and elsewhere, the American serpentine leafminer, Liriomyza trifolii (Burgess) (Diptera: Agromyzidae), is one of the most destructive pests of snap beans Phaseolus vulgaris L. (Fabaceae), cucumbers Cucumis sativus L., squash Curcurbita pepo L. (both Cucurbitaceae), and tomatoes Solanum lycopersicum L. (Solanaceae). In tests with these crops and with cabbage, Brassica oleracea L. (Brassicaceae), we determined and compared numbers of individuals in different L. trifolii life stages, proportions of the larvae surviving to adulthood, and numbers of parasitoids. Highest numbers of L. trifolii mines, larvae, pupae, adults, and parasitoids were typically found on snap beans followed by cucumbers or squash, then often tomato, and tended to be lowest on cabbage. Beans appeared to be the most preferred crop with cabbage the least preferred. The most abundant parasitoid species was Opius dissitus Muesebeck (Hymenoptera: Braconidae), and adult parasitoid abundance seemed to generally depend on the abundance of its host, L. trifolii. For the means of dates in Tests 1 and 2, however, a higher percentage of the larvae survived to adulthood on cabbage than on the other crop species, and for means of dates in Test 1, a smaller percentage of larvae became adults on beans than on cabbage or tomato plants. A consistent occurrence with different life stages of L. trifolii on beans was that fewer insects were found on the last sample date compared with the initial three dates, and for the other crops, fewer insects appeared on the first or final on than the second or third sample dates.

Keywords

Leafminer; Snap Bean; Cucumber; Squash; Tomato; Cabbage