Amsalingam Roobak kumar » Публикация
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Опубликовано
2011-08-24
Опубликовано на SciPeople2011-08-24 08:15:09
ЖурналExperimental and applied acarology
Life table and predatory efficiency of Stethorus gilvifrons (Coleoptera: Coccinellidae), an important predator of the red spider mite, Oligonychus coffeae (Acari: Tetranychidae), infesting tea
Аннотация
The ladybird beetle, Stethorus gilvifrons, is a major predator of the red spider
mite, Oligonychus coffeae, infesting tea. Biology, life table and predatory efficiency of
S. gilvifrons were studied under laboratory conditions. Its average developmental period
from egg to adult emergence was 19.2 days. After a mean pre-oviposition period of
5.3 days, each female laid an average of 149.3 eggs. Adult females lived for 117.3 days
and males for 41.5 days. The life table of the beetle was characterized by an intrinsic rate
of increase (r) of 0.066 day-1, net reproductive rate (R0) of 72.2 eggs/female, gross
reproduction rate (Rmx) of 82.3 eggs/female, generation time (T) of 64.9 days, doubling
time of 10.5 days and finite rate of increase (k) of 1.07 day-1. Population dynamics of S.
gilvifrons and its prey, O. coffeae, was monitored by sampling 25 tea leaves from each
experimental block grown under the prevailing field conditions. Populations of S. gilvifrons
reached a peak during January to March and had low incidence during June to November.
Peaks in the populations of S. gilvifrons coincided with the abundance of O. coffeae in tea
fields. Weather factors such as low temperature, high humidity and heavy rainfall
adversely affected the populations of S. gilvifrons. The predatory efficiency of S. gilvifrons
increased during the growth of larval instars. An adult female consumed 205.0 eggs, 92.2
larvae, 81.8 nymphs and 52.4 adult mites per day.
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