Studies On The Resistance And Mechanism Of Spring Wheat To Macrosiphum Avenae (Homoptera: Aphididae)

Macrosiphum avenae (Homoptera:Aphididae) is an important pest of wheat in the world. The chemicals have mainly been used to control the wheat aphids for a long time, which not only pollutes the environment but also causes the pests to produce the resistance to pesticides, and kills natural enemies. Occurring and harming of the wheat aphids have not decreased, and there is a more serious trend instead. Insect-resistant cultivars are one of the most economic and effective measures to control wheat aphids. However, there are rare researches on the resistance to aphids and mechanism of the spring wheat until now. Therefore, the resistance and mechanism of 27 cultivars or lines of spring wheat to M. avenae is studied in order to establish an essential foundation for further selection and utilization of insect-resistant cultivars to control M. avenae .Indoor research indicates that there are remarkable differences in non-preference, antibiosis and tolerance to M. avenae, respectively, among 27 cultivars or lines of spring wheat seedlings, but no remarkable difference in the total resistance. In young seedling stage of different wheat cultivars or lines , chlorophyll, soluble candy, soluble protein, tannin and flavone have remarkable differences, but no remarkable relationship with non-preference, antibiosis and tolerance.The field plot test showes that there are remarkable differences to M. avenae in growth stage among different wheat cultivars or lines. At wheat growth stage, raising experiment in the lab indicates that there are significant differences to M. avenae in the developmental duration and mortality of the nymphae, and the longevity and fecundity of adults among 7 cultivars or lines with different resistance. The adults have shorter longevity and minor fecundity when reared on the leaves of higher resistant wheat varieties. The survival curves fall into Deevey I execept for Xinchun6 falling into Deeveyâ…¢.The intensity of wheat resistance is Yingbai>Xinchun6>02C-MB> Bafeng1>Yongliang4 >Neimai19 >Menghua1 using the intrinsic rate of increase(rm) as an index of wheat antibiosis to aphids, which is correspondent well with that in fields.Field plot tests indicates that there are remarkable differences in the loss rates of spike, thousand grain weight and output among different wheat varieties or lines. Using the loss rate of output as an index of the wheat total resistance to M. avenae, the result indicates that 02C-MB is the strongest, secondly CDS16 and CDS17, and longmai26 is the weakest,...