Abstract
The aim of this study was to screen synergistic substances included in existing artificial feeds in order to improve the fertility and survival rate of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), an efficient pest predator. To this end, we analyzed the potential effects of glucose and trehalose on the growth, development, and reproduction of H. axyridis and evaluated the effect of three different artificial feeds on the energy stress of H. axyridis. The artificial diets contained fresh pork liver, honey, sucrose, vitamin C, and royal jelly, which was marked it as Diet1. The glucose was added to diet1, which was marked it as diet2, while adding trehalose to diet1 was marked as diet3. The pre-oviposition period of H. axyridis on Diet 1 was slower than that of Diet 2 and Diet 3. Additionally, the spawning quantity and incubation rate of insects on Diet 2 and Diet 3 were significantly higher than that of those on Diet 1. Finally, the larval developmental time on Diet 1 was significantly slower than that of Diet 2 and Diet 3. These results indicate that the addition of an appropriate amount of glucose or trehalose may affect positively the growth, development, and reproduction of H. axyridis. In addition, further studies showed that ATP, amino acids and fatty acids content in the H. axyridis also increased after the addition of the synergistic substance. All these results show that proper adjustment of stored energy anabolic and catabolism is important to maintain the metabolic balance of the insect’s entire life cycle and the addition of glucose or trehalose has a certain effect on the life indicators of H. axyridis.
Highlights
Agricultural and forestry crop pests seriously threaten the quality and yield of agricultural production, causing huge economic losses (Hansen et al, 1999)
Development, reproductive ability, and substance content indicators in the bodies of H. axyridis, we evaluated the potential role of glucose and trehalose on their growth, development, and reproduction
The results of this study showed that the trehalose, glucose, and glycogen contents in the hemolymph and tissues of larvae that fed on artificial Diet 2 and Diet 3 increased, indicating that the addition of glucose and trehalose has a certain impact on the life indicators of H. axyridis
Summary
Agricultural and forestry crop pests seriously threaten the quality and yield of agricultural production, causing huge economic losses (Hansen et al, 1999). Chemical control is used for the direct elimination or extermination of agricultural and forestry crop pests, the use of pesticides on a large scale causes severe environmental pollution, endangers human health (Youn et al, 2003; Katsarou et al, 2005; Garratt and Kennedy, 2006), and results in the resistance of many pests (Puinean et al, 2010; Kavi et al, 2014; Bass et al, 2015; Saddiq et al, 2015). Agricultural pests, such as Hemiptera, Coleoptera, Lepidoptera, and a variety of economic insects, such as the Asian corn borer (Fadamiro et al, 2005) are some of the insect species fed artificial diets
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