Habitat preferences of three Chorthippus species (Orthoptera: Acrididae) in the Chelmsford area Mean sward height was markedly different at two of the agricultural sites, with the sward at Writtle Set-aside significantly taller and the sward at Long Meadow significantly shorter than all of the other sites (Table 5). Table 5: Mean sward height (standard error (s.c.) shown) for the six study sites Mean values are statistically different at P