STUDIES ON COLONY PERFORMANCE INDEX (CPI) AND ITS USEFULNESS IN MANAGEMENT OF ABSCONDING IN Apis cerana indica Fabricius
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Date
2012-08-31
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University of Agricultural Sciences GKVK, Bangalore
Abstract
The studies on Colony Performance Index (CPI) and its usefulness
in management of absconding in Apis cerana was conducted in UAS,
GKVK, Bangalore during 2011-12. The survey on absconding carried out
in 5 districts of Karnataka revealed that percentage of absconding was
more in Bangalore Rural followed by Dakshina Kannada, Shimoga and
Coorg, and lowest in Uttar Kannada. The wax moth incidence (92.50 %)
followed by scarcity of nectar (70%) and wasp (67.50 %) was recorded as
major threat for absconding. The mean CPI in different seasons was
5.46, 14.14 and 7.28 in rainy, winter and spring season respectively.
There was an increase in CPI from 4.6 to 11.4 in the sugar fed colonies.
There was a decline in the CPI (7.4 to 3.0) of wax moth infected colony
and showed a significant recovery (3.0 to 8.5) after one week of rescue
period. The CPI significantly declined from 8.2 to 1.8 in colonies which
kept in hot sun and significantly recovered from 1.8 to 9.4 during post
rescue period. Decrease in CPI was recorded from 8.0 to 2.6 subsequent
to killing of brood and significant recovery was seen from 2.6 to 8.9
during post killing period. Other colony parameters such as brood,
pollen and honey area also changed with respective treatments. The
comb infestation with wax moth, brood mortality, and exposure of
colonies to hot sun would severely affect the CPI. Feeding sugar syrup
and pollen other rescue measures would help buildup of CPI and save
colonies from absconding.
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Keywords
animal developmental stages, biological phenomena, area, honey, wood, seasons, research methods, apiaries, waxes, sugar