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Опубликовано
2011-08-24
Опубликовано на SciPeople2011-08-24 08:00:30
ЖурналBiological Control
Life table and predation of Oligota pygmaea (Coleoptera: Staphylinidae) a major predator of the red spider mite, Oligonychus coffeae (Acarina: Tetranychidae) infesting tea
Аннотация
The staphylinid beetle, Oligota pygmaea (Solier) is an important predator of the red spider mite, Oligonychus
coffeae (Nietner) infesting tea. Biology, life table and predatory efficiency of O. pygmaea were studied
under laboratory conditions. Duration of developmental stages of O. pygmaea was 3.2, 5.7 and 12.5 d for
eggs, larvae and pupae, respectively with an average of 23.0 d from egg to adult emergence. After a mean
preovipostion period of 2.9 d, each female laid an average of 400.5 eggs in its life span. Adult O. pygmaea
lived for an average of 54.1 d. Adult females lived for a longer period of 58.8 d compared to the longevity
of 49.4 d of adult male. Studies revealed that its life table characterized by an intrinsic rate of natural population
increase (r) of 0.118 d, net reproductive rates (Ro) of 243.693 eggs/female, gross reproduction rate
(Rmx) of 245.313 eggs/female, generation time (T) of 46.575 d, doubling time (DT) of 5.874 d and finite
rate of increase (k) of 1.125 d. Seasonal abundance of O. pygmaea and its prey, O. coffeae was monitored by
sampling 25 tea leaves randomly from each experimental block grown under the prevailing field conditions.
O. pygmaea showed a typical pattern of population dynamics with a peak during January to March
and low incidence during June to September. Peak in the population of O. pygmaea coincided with the
abundance of O. coffeae in the tea fields. Weather factors such as high temperature, low relative humidity
and low sunshine hours adversely affected the populations of O. pygmaea. The first to third instar larvae
of O. pygmaea consumed 31.0–133.2 eggs of mites per day. Third instar larva of O. pygmaea consumed an
average of 133.2 eggs, 46.4 hexapod larvae, 39.6 nymphs and 11.4 adults per day. Adult females consumed
more number of red spider mites compared to the males.
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