Research on the Selectivity of the Beetle for the Different Willows

[Objective] The selectivity of beetle(Anoplophora glabripennis) for the different willow varieties was researched for the provision of a strong reference for the breeding and selection of willow variety with insect-resistance.[Method] The investigation of the willows damaged by beetles in some areas of Beijing and Hebei Province and the experiment in insects' damage in field and net house for the order that the beetle damaging the different host willow.[Results] Under the conditional condition of growth location,tree age and tree growth,the order of the different willow varieties(lines) damaged by the beetle was: Tao willow upland willow willow Mantou willow.It was indicated that the result from the insects' damage in net house test in its susceptible to beetle was met with the result from the natural condition.The damage of the beetle to willow was ultimately reflected in the number of surviving larvae overwintering and the greatest harm of larvae after its overwintering,which were analyzed according to three indicators: the number of surviving larvae overwintering,the number of egg-laying and the number of hatching larvae.The order of the resistance of six willow varieties(lines) to the insect was: willow,Mantou willow golden weeping willow,Nanjing willow fast-growing willow,upland willow.[Conclusion] The beetle caused the heaviest damage to fast-growing willow and lighter damage to willow and Mantou willow.