Efficiency of the convergent ladybird beetle Hippodamia convergens against the legume aphid Aphis craccivora in laboratory and semi-felid conditions. | ||||
| Annals of Agricultural Science, Moshtohor | ||||
| Article 13, Volume 58, Issue 3, September 2020, Page 655-664 PDF (594.18 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/assjm.2020.131640 | ||||
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| Author | ||||
Hadeer S. A. Rashed 
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| Plant Protection Department, Faculty of Agriculture, Moshtohor, Benha University, Egypt. | ||||
| Abstract | ||||
| Laboratory and semi-field studies were conducted to investigate some biological parameters, feeding capacity and releasing efficiency of Hippodamia convergens on legume aphid, Aphis craccivora. At 25±2˚C and 65±5 R.H., durations of the eggs' incubation period, the four larval instars and pupae were 4.48, 2.11, 2.23, 2.23, 2.68 and 4.39 days, respectively. The average feeding of the 4th instar larvae fed on 84.47 aphids of 4th nymphal instar, being the highest voracious feeder compared to the first three larval instars which consumed the means of 14.4, 21.3 and 32.87 individuals, respectively. When fed on A. craccivora nymphs, female survived longer (50.83 days) than male (34.73days), a single H. convergens female deposited average total of 455.13eggs. The semi-field studies evaluated the controlling capacity against infestation by A. craccivora on faba bean seedlings by H. convergens released under greenhouse conditions, as; only adults, only 3rd instar larvae and both stages. Either of the three treatments for releasing Hippodamia caused reductions of aphid densities than control. In experiment one; 3, 9 and 15 adults/plot were released only one time. Ten days after release, the treatment receiving 15 adults/plot showed the highest reduction rate in aphids (100.00%) compared to that received 3adults (86.78 %) or 9 adults (95.41%) /plot. In the second treatment; 3, 9 and 15 larvae/plot were released one week after infestation, reduction rate of 96.93% occurred 10 days after releasing of15 larvae/plot. In the third experiment; both stages altogether were released at 3 ratios, i.e., 1adult:2 larvae, 3 adults:6 larvae and 5adults: 10larvae/plot. The highest reduction rate (99.14%) of A. craccivora occurred by the third treatment (5A:10L/plot) after 13 days from the releasing date. Treatment receiving only adults showed the highest reduction rate of A. craccivora densities compared to the two other treatments. Accordingly, releasing H. convergens adults only was better than the other two treatments for control of A. craccivora infestations. | ||||
| Keywords | ||||
| Hippodamia convergens- Aphis craccivora; Biology; Release | ||||
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