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Effects of Diet on the Biology and Life Tables of Typhlodromalus peregrinus (Acari: Phytoseiidae)

The biology of Typhlodromalus peregrinus (Muma) was studied in the laboratory at 26°C. Each of the following organisms was evaluated as suitable diet: all stages of Tetranychus urticae Koch; immature stages of Panonychus citri (McGregor) (Acari: Tetranychidae); and pollens of Malephora crocea (Jaquin), Quercus virginiana Miller, and Typha latifolia (L.). The combination of T. urticae with each pollen was also tested. Total developmental time ranged between 5.73 and 7 d for females and between 5.67 and 6.93 d for males. The percentage of females in the total population ranged between 53 and 61%. A diet of T urticae provided the shortest generation time (G), greatest female longevity, and mean total fecundity (F) which resulted in the highest net reproductive rate (Ro) value (25.31 expected females per female), intrinsic rate of increase (r m = 0.224), and finite rate of increase (e r m = 1.25) per day for T. peregrinus. Diets of only P. citri or M. crocea resulted in close values of G = 8.67, 8.91; F = 47.11, 49.47; R 0 = 24.00, 26.65; r m = 0.210, 0.219; and e r m = 1.23, 1.24, respectively. Q. virginiana and Typha latifolia were the least favorable food sources, with results of G = 8.78, 9.41; F = 30.38, 24.25; R 0 = 14.20, 12.04; r m = 0.193, 0.170, and e r m = 1.21, 1.18, respectively. The r m values were highly affected by generation time and mean total fecundity (R 2 = 0.947).