Effects of water extracts of frass obtained from lab-reared desert locust fed with romaine lettuce in Tunisia on the number of A. Egg pods laid and B. Holes dug by adult female desert locusts presented with sand mixed with frass extracts. Two cups containing frass extracts (treated) and water (control) were simultaneously presented to locusts in each of two locust cages for seven or eight days, and the data were combined. Numbers in parentheses indicate the total numbers of days observed. Asterisks indicate a significant difference at the 5% level with a t-test. n.s. indicates no significant difference.