Generational Parasitism of Aphidius gifuensis on Myzus persicae

doi:10.16409/j.cnki.2095-039x.2021.07.009

Abstract

Abstract: Generational parasitism of Aphidius gifuensis on Myzus persicae was measured using A. gifuensis continuously bred for 8 generations at different densities in the insectary. The results showed that when the aphid densities were 50 per plant and 25 per plant, the parasitic rates were 19.33% and 14.67%, respectively. There was a positive correlation between parasitism rate and A. gifuensis female density, the highest (28.67%) recorded with 3 A. gifuensis female wasps per plant. Emergence rate of the offspring wasps were not affected by the mother density. Parasitism of A. gifuensis gradually weakened from F1 to F8 generation, parasitic rate was as high as 64.00% with F1 generation wasps but dropped to 46.40% with F8 generation wasps. The emergence rates of offspring wasps were above 87.50% in all the F1-F7 generations but dropped to 69.64% in F8 generation. It is obvious that continuous breeding A. gifuensis will degrade its capabilities, especially after the seventh generation. Therefore, the insectary A. gifuensis population should be rejuvenated by crossing with wild population after continuous breeding for 7 generations.

Key words: Aphidius gifuensis, Myzus persicae, different generation, parasitic effect, emergence effect

CLC Number:

476.3

WANG Qiaoni, LAI Rongquan, GU Gang, WU Xiaoting, BAI Jingjing, MI Yuee, SHU Jing, GAO Gaigai. Generational Parasitism of Aphidius gifuensis on Myzus persicae[J]. Chinese Journal of Biological Control, 2021, 37(5): 963-969.

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