| Ammopiptanthus mongolicus (Maxim.) Cheng f. belongs to Leguminosae,which is a peculiar evergreen broadleaf bush in Alashan deserted grassland and also a rare and endangered plant under the third grade in China.In recent years more and more scholars have been studying on Ammopiptanthus mongolicus (Maxim.) Cheng f. because of its resource values and the significance of scientific research, but there was no public reports on the studies on pests of Ammopiptanthus mongolicus ( Maxim.) Cheng f. and the pest control. The author has found that insect pest is a factor leading to endanging for Ammopiptanthus mongolicus (Maxim.) Cheng f. through research. At the same time, through field work and experient indoor the author has studied on four key problems including the species of pests, bionomics of main pests, ways to damage and harm pattern, and the control of main pests. The studies provides with some valuable results in theory and application in aspect of pest control for conversation of Ammopiptanthus mongolicus (Maxim.) Cheng f. .Research results and main conclusions are as follows:At preliminary finding out the species of pests damaging flowers,pods,seeds and leaves add up to 32, which belong to 15 family of 6 order. 21 species damage leaves, of them main pest is Plalymycterus sp . 29 species damage flowers , of them main pests are Psylla mongolicus Loginova, Anatolica mucronata Reitter, Monatrum tuberculiferum (Reitter) and Melanesthes maowusensis Ren . 28 species damage pods, of them main pests are Psylla mongolicus Loginova, Anatolica mucronata Reitter, Monatrum tuberculiferum (Reitter), Melanesthes maowusensis Ren and Orgyia ericae Germar. 15 species damage seeds, of them main pests are some beetles of Tenebrionidae. In addition, soil-dwelling pests contain grub, wireworm, larva of Tenebrionidae and larva of Curculionidae.For the first time the thsis reports the bionomics of main pests including Psylla mongolicus Loginova, Anatolica mucronata Reitter, Monatrum tuberculiferum (Reitter) and Melanesthes maowusensis Ren. In meantime, the author has studied thoroughly on the bionomics of main pests including Orgyia ericae Germar, Platymycterus sp, Deracanthus jakovlevi Suvorov, Chloebius psittacinus Boheman, Proagopertha lucidula Faldermann, Chioneosoma reitteri Semenov, Trematodes grandis Semenov and Serica orientalisMotschulsky and four sorts of soil-dwelling pests.Occurrence of pests of Ammopiptanthus mongolicus (Maxim.) Cheng f. follows certain patterns, Florescence, pod period and tender leaf period are three peak-periods of occurrence in a year. During florescence and pod period pests which have piercing sucking mouthparts such as Psylla mongolicus Loginova pierce and sunk juice of flower and pods. At the same time, pests which have chewing mouthparts such as Anatolica mucronata Reitter, Monatrum tuberculiferum (Reitter) and Melanesthes maowusensis Ren gnaw flowers and pods. These cause reduction in rate of flowering, podding, seeding, and seed quality, which hinder the renewal of breeding materials. During the period of tender leaves pests which have piercing sucking mouthparts such as Psylla mongolicus Loginova pierce and sunk juice of tender leaves. In meantime, pests which have chewing mouthparts such as Platymycterus sp gnaw leaves, which influence physiological process of photosynthesis even cause plant to die. Soil-dwelling pests damage tender roots and fibrousroot, which influence assimilating nutriment and sucking up moisture. Furthermore, some main pests have their own pattern of occurrence.The control of pests of Ammopiptanthus mongolicus (Maxim.) Cheng f. ought to grasp three key periods- namely florescene,pod period and tender leaf period, the most important strategy is taking preventive measures. During Florescence the emphatic object of control is Psylla mongolicus Loginova, the second are Anatolica mucronata Reitter, Monatrum tuberculiferum (Reitter) and Melanesthes mao\vusensis Ren, the third are other pests. When tender pod length is below 2 centimetres, the emphatic obje...
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