Effects of key parameters in the field application of banker plant system on population colonization and pest control of Coccinella septempunctata
Banker plant system is an emerging protective biological control technology for improving the efficient and sustainable pest control of natural enemy insects in recent years,but the effect is unstable in field application,mainly due to the lack of clarity of key parameters in the field application of banker plant system.Coccinella septempunctata,as a high efficiency predator,severely limits its sustainable pest control efficiency due to its low colonization rate in the field.The study explored how key parameters such as the initial density of different alternative prey affect the population dynamics of the predator insect,C.septempunctata,and its efficacy in controlling the target pest,Myzus persicae.The experimental results indicated that when the alternative prey,Megoura crassicauda,was inoculated at different initial densities in the banker plant system,there were significant differences in the number of individual C.septempunctata and the density of M.persicae.The Y300 and N300 treatment groups,with an initial inoculation density of 300,had significantly lower M.persicae populations between 21 to 28 days compared to other treatment groups,and the colonization rate of C.septempunctata was significantly higher between 7 to 14 days compared to other groups.Compared to the control,the initial setup of a 1-day cover removal effectively helped maintain the number of C.septempunctata individuals and was conducive to the establishment of egg and larval populations within 7 to 14 days.At a distance of 9 meters from the banker plant system,the colonization rate of adult C.septempunctata was higher than in other treatment groups,proving that the effective range of the C.septempunctata banker plant system can reach up to 9 meters,which was beneficial for the maintenance of C.septempunctata populations and the sustainable control of pests.This study provides theoretical support for the scientific application in the field,which helps to improve and optimize sustainable pest control ecological strategies in conservation planting systems.
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