Effects of water extracts of leaves of various plants and desert locust frass collected after locusts fed on these plants on the numbers of egg pods laid by adult female desert locusts presented with sand mixed with extracts. Sand wetted with water was also presented as a control. Three cups containing leaf, frass extract, and water (control) were simultaneously presented to locusts in one (A, C, D) or two locust cages (B, E, F) for three to five days, and the data were combined in (B), (E), and (F). Numbers in parentheses indicate the total numbers of days observed. Bars on histograms indicate one standard deviation. Different letters in each panel indicate significant differences at the 5% level with Tukey’s multiple comparison test. DG, Dactylis glomerata (orchard grass); BO, Brassica oleracea var. capitata (cabbage); SB, Sorghum bicolor (sorghum); LS, Lactuca sativa var. longifolia (romaine lettuce); BR, Brassica rapa var. perviridis (Japanese mustard spinach); MS, Miscanthus sinensis (silver grass).