Aphids cause considerable damage to numerous crops all over the world and insecticides are the main means of controlling them, despite their detrimental impacts on human and environmental health. This study assessed the effectiveness of the parasitoid Aphidius colemani Viereck (Hymenoptera: Braconidae), a mixture of predatory ladybird beetles, Hippodamia variegata Goeze, Chilocorus calvus Chiccl, and Cheilomenes propinqua Mulsant (Coleoptera: Coccinellidae), and an entomopathogenic strain of Aspergillus flavus Link (Eurotiales: Trichocomaceae), collected locally in Tanzania, to control Aphis fabae Scopoli (Hemiptera: Aphididae). After assessing the predation and parasitism rates of these natural enemies at different aphid densities in laboratory experiments, their ability to control aphids on kalanchoe was assessed in a greenhouse experiment over two seasons. The largest number of A. fabae parasitized or consumed in the laboratory was found at a density of 160 aphids per predator, or parasitoid. At that density, an adult female of A. colemani parasitized 114 A. fabae per day, on average, and adults of C. calvus, H. variegata, and C. propinqua consumed 75, 72, and 85 aphids per day, respectively. A. flavus spores applied at 1 × 10⁷ spores ml⁻¹ reduced the aphid population by 7.9 and 12.6 times within 10 days in the first and second seasons of the greenhouse experiments, respectively, as opposed to 2.8 and 2.5 times by releasing a mixture of the ladybirds at a rate of 5 adults/m², and by 3.3 and 9.5 times by releasing A. colemani at a rate of 2 adults/m². This study confirmed the potential of these locally collected bio-control agents for controlling A. fabae. However, use of the isolated A. flavus strain was undermined by its production of aflatoxin. Further research is therefore required to tap into the potential of a non-toxic strain of A. flavus and/or other entomopathogenic fungi.

蚜虫对世界各地的许多农作物造成了相当大的损害，尽管杀虫剂对人类和环境健康产生了不利影响，但杀虫剂却是控制它们的主要手段。本研究评估了寄生的有效性烟蚜colemani Viereck（膜翅目：茧蜂），捕食性瓢虫的混合物，Hippodamia羊蹄甲Goeze ，红点唇积雨云Chiccl，和Cheilomenes园竹瓢虫（鞘翅目：瓢虫科），以及昆虫病原株黄曲霉链接（欧洲名：Trichocomaceae），在坦桑尼亚当地采集，用于控制蚜虫斯科波利（半翅目：蚜科）。在实验室实验中评估了这些天敌在不同蚜虫密度下的捕食率和寄生率之后，在两个季节的温室实验中评估了它们在长寿菜上防治蚜虫的能力。在实验室中被寄生或消耗掉的最大数量的农杆菌，每个捕食者或类寄生虫的密度为160蚜虫。在该密度，成年女性A. colemani寄生114 A.蚜每天的平均值，和成人C.积雨云，H.杂色，和C.园竹分别每天食用75，72，和85蚜虫，。黄曲霉孢子以1×10 ⁷施用孢子ml ^-1在温室试验的第一季和第二季内，在10天内分别减少了7.9和12.6倍的蚜虫种群，而通过以5个成虫/ m ²，并以2个成年人/ m ²的速率释放A. colemani分别为3.3和9.5倍。这项研究证实了这些本地收集的生物防治剂对控制农杆菌的潜力。然而，分离的黄曲霉菌株的使用由于其产生黄曲霉毒素而受到破坏。因此，需要进一步的研究以挖掘无毒曲霉菌株的潜力。 和/或其他昆虫病原真菌。