Evaluation Of The Control Effect Of The Aphidius Gifuensis Ashmead Banker Plant System On The Myzus Persicae(Sulzer)

The Banker plant system is a new type of biological control strategy.It is a system that can maintain its activity and continuously provide natural enemy resources to realize autonomous reproduction.In the three-level nutritional relationship of banker plant-substitution host-natural enemy,banker plant can directly or indirectly affect the natural enemy.The bank plant not only provides a habitat for the natural enemy,but also affects the quality of the substitute host,thereby affecting its growth and development and control effects.Myzus persicae(Sulzer)is an important economic pest all over the world,which can damage a variety of cash crops.As an important parasitic natural enemy of M.persicae,Aphidius gifuensis Ashmead is widely used in biological control of M.persicae.This article mainly screens the banker plant and establishes the "radish-L.erysimi-A.gifuensis" banke plant system,aiming to change the inefficiency of traditional biological control and improve the adaptability after the release of natural enemies and promote the colonization of natural enemies,And ultimately improve the level of biological control,with more efficient and economical control measures to control M.persicae.The main results were summarized as follows:1 The selectivity,growth,development and reproduction of Lipaphis erysimi(Kaltenbach)on different host plantsThe selectivity of L.erysimi on different host plants was significantly different.And L.erysimi originally from cabbage,radish and kale for the four plant hosts all preferred to radish.L.erysimi originally on preferred to choose the primary host,which is no significant difference with choosing radish.Different host plants also affect the development and reproduction of L.erysimi.The development period of L.erysimi is the longest on cabbage and the shortest on radish,but the difference between cabbage and radish is not significan.fecundity and daily fecundity of L.erysimi on host radish were significantly higher than the other three hosts.These results indicated that radish is most suitable for L.erysimi on four kinds of host plants,especially suitable for its growth,development and reproduction.In contrast,cabbageis the opposite.2 The feeding behavior of L.erysimi to different host plants and the selectivity of A.gifuensis to L.erysimiThe electrical penetration graph was carried out to determine feeding behavior of L.erysimi on the Chunbaiyu?Mantanghong?Baitianshi?Manshenhong.Analysis of main waveforms produced by sucking different host plants from L.erysimi: the mean duration of C waves for L.erysimi on the four radish varieties was Baitianshi>Manshenhong>Mantanghong>Chunbaiyu.The average duration of E2 wave was the longest in Baitianshi,followed by Chunbaiyu;Analysis of the parasitic effects of A.gifuensis on L.erysimi on different host plants:The parasitic rate of A.gifuensis to L.erysimi on Chunbaiyu was the highest(19.22%),The emergence rates of mummified aphids was Mantanghong(71.81%)?Baitianshi(68.60%)?Chunbaiyu(68.40%)? Manshenhong(66.47%).The sex ratio of A.gifuensis to L.erysimi on Chunbaiyu was the highest(76.67%)significantly different with Mantanghong.The results showed that under the same conditions,L.erysimi.preferred to eat Chunbaiyu,and Chunbaiyu could be used as a banker plant to propagate a large number of L.erysimi.and A.gifuensis.3 Establishment of a plant system for A.gifuensisIn the establishment of A.gifuensis Banker plant,it was determined that the wasp aphid ratio of A.gifuensis and the replacement host L.erysimi was 1:100.In the wasp aphid ratio1:100 treatment group,A.gifuensis had the highest emergence rate to the replacement host L.erysimi.The wasp population is the smallest.The wasp aphid ratio1:25treatment group had the highest parasitic rate,and L.erysimi could be completely parasitized.The wasp aphid ratio 1:100 treatment group A.gifuensis had the parasitic rate of L.erysimi dropped to 29.33%.The study to determine the starting amount of alternative host L.erysimi showed that the larger the starting amount of 7d,14 d,21d L.erysimi,the more mummified aphids formed.The initial quantity of L.erysimi was600 heads and L.erysimi had been parasitized at 28 days in the 800 head treatment group,and the duration was slightly shorter.The starting quantity of L.erysimi was200 heads,and L.erysimi in the 400 head treatment group could last until 35 days.Comprehensively consider the wasp aphid ratio of 1:100 and the initial aphid population of 500 as the standard to establish the banker plant system.4 Control Effect of A.gifuensis Blanker Plant System on M.persicaethe control effect of 5,10,15,20,25 banker plant systems on M.persicae in10�10 m tobacco fields were systematically studied in Shibing County,Guizhou Province.The result showed that there was no significant difference in the number of M.persicae among the treatments before the release of banker plant system.After releasing the carrier plant system for 25 days,the number of M.persicae in 20 and 25 banker plant systems was significantly lower than that in the control group and other treatment groups.The population reduce rates of 5,10,15,20 and 25 banker plant systems were-46.19%,-55.26%,-18.47%,10.18% and 24.53%,respectively,and control effects of 20 and 25 banker plant systems were 70.99% and 77.17%,respectively.In summary,the best proportion of banker plant system to control M.persicae is 25 plants per 10�10 m area.In practical application.