| 邓嘉茹,刘志伟,霍立志,等.纤丽瓢虫对豆蚜的捕食功能反应[J].广东农业科学,2024,(10-11):- |
| Predatory functional response of Harmonia sedecimnotata to Aphis craccivora |
| 投稿时间：2024-09-20 修订日期：2025-01-11 |
| DOI： |
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| Abstract: |
| 【Objective】The predation ability of Harmonia sedecimnotata to Aphis craccivora was clarified, which would provide scientific basis for control of A.craccivora by H.sedecimnotata in the field.【Methods】H.sedecimnotata and A.craccivora were taken as experimental subjects. H.sedecimnotata in different stages and different density gradients of late instar nymphs of A.craccivora were prepared to determine the predation function response, search effect and intraspecies interference response of H.sedecimnotata to A.craccivora by indoor predation method and numerical model.【Results】The predation function of each instar of larva and adults of H.sedecimnotata was consistent with Holling II model. The predation amount increased with the increase of prey density. However, the rate of increase is gradually decreasing. When the prey density reached a certain level, the predation amount changed little. The instant attack rate(a) of 1-4st larvae, female and male adults were 0.824, 0.808, 1.364, 1.139, 1.499, 1.626, and their handling time(Th) were 0.060, 0.014, 0.006, 0.003, 0.004, 0.005 d, and their maximum daily predation were 16.667, 71.428, 166.667, 333.333, 250.000 and 200.000, respectively. The predation capacity of each instar and adult of the ladybird were ranked from strong to weak as 4th instar, female adult, male adult, 3st instar, 2st instar and 1st instar, respectively. The predation amount of larvae increased with the increase of age. For the 4st larvae, the handling time(Th) was the shortest , the predation capacity(a/Th) was the highest , the maximum daily predation was the highest . which were 0.003 d, 379.667, and 333.333 aphids, respectively. The search effect of the ladybird was decreased whith the increase of prey density. The search effect of female was greater than that of male.The effect of the adult H.sedecimnotata’s density on the predatory effect of A. craccivora was consistent with the Hassell model. There was intraspecies interference among adult H.sedecimnotata, and the interference equations of female and male adults were E=0.465P-0.515 and E=0.366P-0.505, respectively. The average predation rate and intensity of scramble competition of adults decreased and increased with the increase of prey density, respectively. The prey killed by per predator decreases with increasing predator density. When the predator density reached 5 predators per plate, the predation efficiency of female and male adults was the lowest, which were 0.198 and 0.172, and the intensity of scramble competition was the highest, which were 0.548 and 0.558.【Conclusion】 H.sedecimnotata is an important natural enemy in the biological control of A. craccivora, which has a strong predatory ability on the aphids. In practical application, when the population of aphids to a high density, the 4st instar larvae and adults should be released for control. In practical application, suitable insect state and quantity should be adopted according to the occurrence density of aphids. |
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