Dissertation
Dissertation > Agricultural Sciences > Forestry > Forest Protection > Forest Pest and Disease Control > All kinds of tree pests and diseases and their prevention

Effect of the Host Growth and Arthropod Communities of the Invaded Insect Pest Corythucha Ciliata (Say)

Author ZhangXiong
Tutor LiChuanRen; XiaoJiaHao
School Yangtze University
Course Rural and Regional Development
Keywords Corythucha ciliata (Say) Platanus spp. falling-off growth the arthropodcommunity diversity time niche
CLC S763.7
Type Master's thesis
Year 2013
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Platanus spp.are famous for elegant shapes and flourishing leaves, which share the reputation of "the king of street trees". The species is growing in many cities, through all measures of township introduction and cultivation, leading to the focused researches on pest control, physiological and biochemical aspects. The invasive species Corythucha ciliata (Say) threaten Platanus spp.uniquely, which makes the studies most focused on effects of different density nymphs on its development and reproduction at room temperature. However, the simulation of the wild environment with different population density and growth and development of the host plant sycamore studies have not been reported. Effects of Corythucha ciliata (Say) invasion into the arthropod community diversity have also been reported. The paper discussed the relationship between Corythucha ciliata (Say) and the sycamore arthropod communities to detect the infestation density of fallen leaves of Platanus sapling, growth state (plant height and roughness), arthropod community diversity and time niche as the core content, observed in the different infestation of density in the case of Platanus leaves, growth height and roughness, comparing2009and2010in Wuhan City, the main road Platanus species of arthropod community composition, species abundance, diversity index and species sequence competition for resources, in order to understand the arthropod community structure and composition, the effective control of the pest has practical value. The main conclusions are listed as follows:(1) The populations were significantly related to the infestation densities. On July22. the density with4/per and6/per reached the peak, while the value equaled on August11with2/per population inoculation.(2) The effects of pests on the tree falling and growth state were measured in the network room. The results showed that the original infestation density of larva greatly impaired the Platanus sapling with the tendency to accelerate the falling-off speed in accordance with the high density of infestation at the critical point in late September. However, the high-density infestation did not reduce the height and thickness of the Platanus sapling.(3) The collected species available in the Aoyama shade Square. East Lake Aquatic, and Xudong Road total were classified as two classes, ten orders, twenty-seven families, including the majority species collected from the East Lake (374head/sample), then by Castle Peak green Yam Square (280/sample) and finally Xudong (102/sample)(4) The arthropod community of Platanus was listed by species abundance as follows: Castle Peak shade Square> Xudong> East Lake. IHB. The diversity index of Xudong was0.8047and1.7782with the uniformity as2.1042; The diversity index of the East Lake Aquatic was0.9063and.2.4631with the uniformity as2.2112; The diversity index of Castle Peak shade Square was0.6696and1.5139with the uniformity as1.5139. The Corythucha ciliata (Say) proportion of each group of species was up to33.04%,24.73%followed by natural enemies, like Formicidae as19.46%, Chironomidae as18.53%, red with textured thrips as4.25%.(5) The total species collected in the Castle Peak shade square, Academy of Agricultural Sciences, East Lake aquatic species were numbered as2classes,8orders,37families, where East Lake contained311/sample, followed by297/sample in Castle Peak and then190/sample in Academy of Agricultural Sciences.(6) The species abundance of the arthropod community in sycamore trees of Donghu aquatic areas in late July was centered on Selenothrips rubrocinctus(Giavd) with the maximum value of0.5943. Similarly, the species abundance of the arthropod community in sycamore trees of Aoyama shade square in mid autumn was centered on Selenothrips rubrocinctus(Giard)with the maximum value of0.8772. In addition, the species abundance of the arthropod community in Platanus of Academy of Agricultural Sciences in late July was centered on the Formicidae with the maximum value of0.4000. The species diversity in early July at the Academy of Agricultural Sciences was0.9156,2.6142, with the uniformity as2.1710; The species diversity in early July at the East Lake Aquatic was0.9014,2.5134, with the uniformity as2.0874; The species diversity in late July at the Aoyama was0.9014,2.5134, with the uniformity as2.0874. Aoyama, tree-lined square species diversity0.8704,2.1682, with the uniformity as2.1682. Selenothrips rubrocinctus(Giard) dominated in the Platanus arthropod community with the major proportion of51.24%, while natural enemies covered up to21.67%, with the minimum proportion of Corythucha ciliata (Say) by1.17%.(7) The time niche for dominant species of the Platanus arthropod community in2009was investigated and analyzed. The results indicated that Formicidae species the as the natural enemy covered the maximum life length while the Selenothrips rubrocinctus(Giaid) shared the minimum life span. Corythucha ciliata (Say) and Selenothrips rubrocinctus(Giard) shared the maximum overlapping niche (0.2242), while Selenothrips rubrocinctus(Giaid) and Chironomidae shared the minimum overlapping niche (0.0430). The niche similarity percentage ranged from0.2645to0.8226; The inter-specific competition coefficient of the Formicidae and the Chironomidae reached the top (0.9612), while Corythucha ciliata (Say) and natural enemies shared the minimum (0.2313). The niche breadth in2010was sequenced as follows:predators>the Formicidae> Selenothrips rubrocinctus>Tortricidae> Corythucha ciliata (Say).The Formicidae and Corythucha ciliata overlapped the most (0.2705) while shared the least overlap with the natural enemies minimum (0.0741); The niche proportional similarity ranged from0.4341to0.8798; The inter-specific competition intensity between the Formicidae and predators was the top (0.9155), but the lowest between Corythucha ciliata and red elenothrips rubrocinctus (0.5876).

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