Bio-ecology of the Coriander Aphid and Feeding Potential of its Dominant Natural Enemy
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Date
2009
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Publisher
MPUAT, Udaipur
Abstract
Investigations were carried out on the bio-ecology of the coriander aphid and
feeding potential of its dominant natural enemy at the Horticulture Farm and in the
Department of Agricultural Zoology and Entomology, Rajasthan College of
Agriculture Udaipur during in rabi 2008-09. The incidence of coriander aphid,
Hyadaphis coriandri (Das.) began in the second week of January 2009 that gradually
increased in numbers reaching to the maximum (584.16 per 3-plant total) in the first
week of February 2009. The aphid population was negatively correlated with mean
atmosphere temperature and significant negatively correlated with relative humidity.
The predatory activity of the coccinellids, C. septempunctata and M. sexmaculata also
began in the second week of January, and during January to February their population
ranged from 0.5 to 15 beetles per 3-plant. The adult coccinellids had a significant
positive correlation with atmosphere temperature; whereas, with relative humidity the
correlation was significantly negative. The adult coccinellids as well as grubs had a
significant negative correlation with the aphid population. The study on the biology of
both dominant coccinellids under ambient conditions of temperature and relative
humidity has been presented.The feeding potential of adults of C. septempunctata and
M. sexmaculata showed an increasing trend in the average prey consumption per day.
The coccinellid, C. septempunctata recorded higher percentage feeding at lower
aphid densities that gradually reduced with increased aphid-prey density being the
highest (91.4%) at an aphid density of 20 and the lowest (36.52%) at an aphid density
of 320. However, the other coccinellid, M. sexmaculata registered a near-uniform
feeding at aphid densities of 20, 40, 80 and 160; whereas, as at aphid density of 320
the feeding response was the lowest (45.77%).
Description
Bio-ecology of the Coriander Aphid and Feeding
Potential of its Dominant Natural Enemy
Keywords
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Citation
Meena and Bhatti, 2009