Study On The Effect Of Urban Green Space Insectary Plants On Attracting Natural Enemy Insects

Insectary plants can provide the natural enemies with nutritious food sources and more diversified habitats,so as to create favorable conditions for the survival and reproduction of natural enemies,thus significantly improving their control ability and effect.Therefore,the natural enemies supplement nutritious insectary plants have become the research hot spot in the field of conservation biological control.In this paper,on the basis of the attracting experiment of the dominant natural enemy insects(hoverflies,ladybirds,lacewings and parasitoids)in the urban green space,the attracting effect of the natural enemies supplement nutritious insectary plants in the urban green space was studied,and the "Y" olfactometer was used to study the attracting effect of the natural enemies supplement nutritious insectary plants in the urban green space.The main results are as follows:1.The results of color board attracting test showed that there were significant differences in the color among different natural enemy insect species,among which hoverflies preferred blue significantly,parasitoids preferred yellow significantly,and the number of natural enemy insect species attracted by green was the most abundant.There are significant differences in the number of natural enemies in different colors,among which the number of natural enemies in blue is the most.There was no significant difference in the number of natural enemy species between yellow attracting and other color boards,but it could attract parasitoids that were not attracted by other color boards.2.The olfactory preference test showed that there were significant differences in olfactory preference among different woody plants and herbaceous plants,among which Amygdalus triloba?Securigera varia and Echinacea purpurea have moderate olfactory attraction ability to Anastatus sp.The olfactory preference test showed that there were significant difference among herbaceous plants,but no plants showed obvious attraction to Chrysopa pallens.3.The yellow board attracting experiment to eliminate the effect of aphids on the attracting effect of natural enemies on plants showed that Nepeta cataria has a extremely strong attraction to hoverfiles,Securigera varia and Coreopsis grandiflora have a stronger attraction to hoverfiles,Vitex negundo L.var.Heterophylla ? Abelia chinensis and Allium giganteum have a strong attraction to hoverfiles;Taraxacum mongolicum?Helianthus tuberosus and Rudbeckia hirta have a extremely strong attraction to ladybirds,8 kinds of plants including Coreopsis grandiflora and Astragalus propinquus have a stronger attraction to ladybirds,9 kinds of plants including Sorbaria kirilowii and Achillea wilsoniana have a strong attraction to ladybirds;Nepeta cataria?Sorbaria kirilowii and Ligustrum × vicaryi have a stronger attraction to lacewings,Astragalus propinquus and Achillea wilsoniana have a strong attraction to lacewings;Spiraea trilobata?Ixeridium sonchifolium and Taraxacum mongolicum have a stronger attraction to parasitoids.4.Woody plants with white corollas?panicles,and herbaceous plants with yellow corollas?capitulum can attract more natural enemy insects.The scatter plots of plant corolla diameter?corolla depth and the number of natural enemies showed that the corolla diameter and depth of woody and herbaceous plants had no significant relationship with the number of natural enemies.