The biology of the citrus psyllid Diaphorina citriKuwayama was studied at 25°C on four commonly grown citrus andrelated plants [rough lemon, Citrus jambhiri Lush; sourorange, C. aurantium L.; grapefruit, C. paradisiMacfadyen; and orange jessamine, Murraya paniculata (L.)Jack] in the laboratory. The biological characteristics of each lifestage are described. The average egg incubation periods on orangejessamine, grapefruit, rough lemon, and sour orange varied very little(4.1–4.2 d). The average nymphal developmental periods on these fourhost plants were essentially the same except the fifth stadium.Survival of immatures on orange jessamine, grapefruit, rough lemon, andsour orange was 75.4, 84.6, 78.3, and 68.6%, respectively. Femaleadults lived an average of 39.7, 39.7, 47.6, and 43.7 d on theserespective host plants. The average number of eggs laid per female ongrapefruit (858 eggs) was significantly more than those on other hosts(P < 0.05). The intrinsic rate of natural increase(r_m) for D. citri on grapefruit washighest. Jackknife estimates of r_m varied from0.188 on grapefruit to 0.162 on orange jessamine and rough lemon. Themean population generation time on these hosts ranged from 31.6 to34.1 d. The continuous flushes produced by orange jessamine couldplay an important role in maintaining high populations of this vectorwhen the new flushes are not available in the commercial citrus groves.