Control Potential of Different Geographic Populations of Harmonia axyridis on Myzus persicae in Greenhouses of Lhasa
- Received Date: 15/07/2021
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Key words:
- Asian ladybird (Harmonia axyridis) /
- peach aphid (Myzus persicae) /
- preying functional response /
- facility vegetable
Abstract: To clarify the predation potential of Harmonia axyridis on Myzus persicae and the difference in predation ability of different H. axyridis geographic populations, this research, with pepper as the host, evaluated the predation functional responses of each instar larvae and adults of H. axyridis on M. persicae, the predatory capacity 4-instar larvae with different ratios of H. axyridis to M. persicae, and compared the predatory capacity of different geographic populations of H. axyridis.The results indicated that the predation functional responses of H. axyridis could be described by the HollingⅡ model, and the predatory capacities varied conspicuously in different instars and geographic populations. Under the same density of M. persicae, the maximum daily predatory number of H. axyridis was ranked as following: 4-instar larvae (250.00), female adults (166.67), male adults (142.88), 3-instar larvae (62.50), 2-instar larvae (13.33) and 1-instar larvae (3.77). When density of M. persicae was 500, with the increase of the number of H. axyridi, its predatory capacity first increased and then decreased. Based on quadratic regression, when the ratio of H. axyridis to M. persicae was 6:500, the maximum predatory number was 443.10, the best ratio was 1:83. In a comparison of the 4-instar larvae of the three origin locations studied, Linzi 4-instar larvae were found to have significantly higher average daily predatory number than those originating from Shenyang or Fujian, however, there was no significant differences between Fujian and Shenyang 4-instar larvae.