Life-history of the Tetranychus mexicanus (McGregor) (Acari: Tetranychidae) on leaves of the Pupunha or Peach-palm (Bactris gasipaes Kunth)
Keywords:
Mite, Arecaceae, Life-ferti/ity table, TetranychidaeAbstract
The objective of the work was to evaluate the biology of the mite called Tetranychus mexicanus (McGregor), reared on leaflets of Bactris gasipaes Kunth (peach-palm). The test was carried out under laboratory conditions at a temperature of 25°C ± 1ºC, relative humidityof 60,0% ± 10,0% and photophase of 14 hours. The period of development from egg to adult was 13 days for males and 13.6 days for females, with a survival rate of 59.3%. The sex ratio was approx. 4.7 females per ma/e. After a pre-oviposition period of 2 days, the females underwent a period of oviposition, on average, of 12. 1 days, with O.82 eggs per female per day Longevity was 7.1 days for males and 16.7 days for females. The intrinsic rate of increase (r,) was O.06, the finite rate of increase (A.) 1.06 individuais per female per day, the mean generation time (T) 21. 6 days and net reproductive rate (Ro) 3.7.
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