Functional response and predation preference of multicolored Asian lady beetle Harmonia axyridis to two aphids in the micro-landscape of apple and Monnier's snowparsley Cnidium monnieri
In order to assess the biological control potential of multicolored Asian lady beetle Harmonia axyridis to spirea aphid Aphis spiraecola and celery aphid Semiaphis heraclei available in the micro-landscape of apple and Monnier's snowparsley Cnidium monnieri,the predation effect,searching effi-ciency and predation preference of H.axyridis to A.spiraecola and S.heraclei were studied under labo-ratory conditions.The results showed that the functional response of the 1st-4th instar larvae,female and male adults of H.axyridis to the 3rd-4th instar nymphs of A.spiraecola and S.heraclei fitted well with the Holling Ⅱ model.The predation capacity of female adults of H.axyridis against A.spiraecola was the strongest,which was 411.284,while the predation capacity of male adults of H.axyridis to S.heraclei was the strongest(356.403).The instantaneous attack rate of the 2nd instar nymph of H.axyri-dis against A.spiraecola was the strongest,which was 1.231,while the instantaneous attack rate of the 3rd instar nymph of H.axyridis against S.heraclei was the strongest(1.277).The searching efficiency of H.axyridis for A.spiraecola and S.heracleid decreased with increasing prey densities.Under the condition of coexistence of A.spiraecola and S.heraclei,when the total density was 60 individuals per dish,H.axyridis female adults had no significant preference for both aphid species at different ratios;when the total density was 240 individuals per dish,H.axyridis female adults showed significant posi-tive preference for A.spiraecola in the ratios(A.spiraecola:S.heraclei)of 1∶5,2∶4,3∶3 and 4∶2,but showed negative preference for S.heraclei in the ratios of 1∶5,3∶3 and 4∶2.This study suggested that H.axyridis has strong control potential against A.spiraecola in the micro-landscape of apple and func-tional plant.
万方数据
维普
