| Cocodala is a new city in 2015.In the process of urban landscape construction,many seedlings have been introduced from abroad.Due to inadequate quarantine measures,many ’ new ’ pests have been brought.In addition,the summer heat is less severe and summer heat is less in Ili Kazak Autonomous Prefecture,and the water resources are abundant.Appropriate climatic conditions lead to frequent garden pests,which has a great impact on the economic value and ornamental value of landscape plants.However,there is a lack of systematic research.The purpose of this dissertation was to clarify the species of garden plant pests and the occurrence dynamics of major pests in Cocodala City through fixed-point investigation and comprehensive census,so as to provide a theoretical basis for the effective prevention and control of garden pests in Cocodala City.The results are as follows:1.Species of garden landscape plant pests in Cocodala City:A total of 365 species of arthropods belonging to 2 classes,18 orders and 120 families were identified,including 229 species of harmful insects belonging to 79 families and 8 orders,and 4 species of mites belonging to 2 families and 1 order.A Preliminary List of Plant Pests in Cocodala Landscape was established.The dominant pests such as aphids,psylla and Rnynchaenus dlni and the dominant natural enemies such as lacewings,aphid flies and ladybugs were determined from five typical landscapes.2.Dynamics of major pests of garden landscape plant pests in Cocodala City:(1)Occurrence dynamics of main stem-boring pests: Streltzoviella Insularis stem-boring at larval stage caused damage to wax and locust trees.The rate of plant with larva in the whole city was 1.55 %,and the active stage of adults was from the beginning of June to the end of August.Anoplophora glabripennis mainly damaged elm and a small amount of maple trees in urban areas,and the damaged elm accounted for about one third of the total.The adults of Anoplophora glabripennis on elm began to move from early July to the end of August.Agrilus planipennis mainly damaged Fraxinus chinensis,adults from mid-May to late June,the rate of plant with larva was 2 %.Parathrene tabaniformis harmed poplar.The adults first moved in early May.There were two peaks in late May and early July.The young Fraxinus chinensis were eaten by the larvae of Stenocephus Fraxini,which caused great damage to the seedlings of Fraxinus chinensis.From the end of April to the middle of May.Trichoferus campestris mainly harm locust trees,from the end of February to the end of July there are adults out.During the investigation,only two Fraxinus chinensis were found with Xylotrechus grayii,but the population per plant was up to 200,which could cause the death of Fraxinus chinensis in a short time.(2)Occurrence dynamics of main leaf-eating pests: 1-year generation of Apocheima Cinerarius,partial emergence and spawning of overwintering generation have been completed since mid-March,mid-April is the peak period of newly hatched larvae on trees,mainly harmful to elm,mature larvae pupated in mid-May.Rhynchaenus Alni were active from the beginning of April to the end of August,during which there were multiple occurrence peaks.The period with the largest occurrence amount was late April,and the host was Ulmus pumila.(3)Occurrence dynamics of main sucking pests: the color of Cyamophila Willieti during overwintering was dark brown,and many times occurred in green form from the beginning of May to the end of July,most of which feed on the back of leaves,damaging most of the Styphnolobium japonicum in urban areas.There are many hosts of Drosicha Corpulenta,Salix babylonica,Firmiana simplex,Ulmus pumila,and a variety of Rosaceae trees,including Malus spectabilis.The nymphs of Drosicha Corpulenta begin to damage a large number of trees from the beginning of March.Drosicha Corpulenta is dimorphism.The male eclosion period begins at the end of April.Female adults can be observed to lay eggs in the middle and late May,and disappear in the early June. |
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