The Effect Of Food (aphid species) On Development Of The Predator Hippodamia variegata (Goeze) (Coccinellidae: Coleoptera)

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Date
2015-05-21
Authors
Hassan, Gaafer Hassan Salih
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Publisher
UOFK
Abstract
This laboratory experiment was conducted at the Institute of Environmental Research and Natural Resources in winter of the year 2004, under temperature range (15.1 –32.3)°C and Relative Humidity range (23%–27%). The experiment was carried out to study the effects of three different species of aphids: Aphis craccivora (Koch) Melanaphis sacchari (Zhnt) and Aphis nerii (Boy) on the development of H. variegata. The parameters used were the egg incubation period, the percent hatchability , the developmental period and the mortality of the immature stages. There was a statistical significant effect of food on the incubation period and the developmental periods of the different stages. There was no significant effect on the egg hatchability. The predator, (Hippodamia variegata) had the lowest incubation period (2.33 days), the shortest developmental period (10..23 days), and the lowest mortality percentage (26%) when it was fed Melanaphis sacchari (Zhnt.). When it was fed Aphis craccivora (Koch.), the incubation period was 2.69 days, the total developmental period was 13.49 days and the mortality percentage was 30%. When Hippodamia variegata was fed Aphis nerii (Boy.), it showed the longest incubation period (3.50 days), the longest developmental period (14.20 days) and the highest percent mortality (70%).
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May 2006
Keywords
Development
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