| The monitoring and surveillance of insect pests is the cornerstone for their control.The monitoring of the population dynamics of insect pests using light traps can supply the theoretical basis for the control of insect pests.Now the use of light traps for monitoring and controlling insect pests has been an important tactic in the IPM.The coleopterous insects on crops and forests are of a great varieties,among which many species are of economic significance,some are important agricultural and forestry pests such as soil pests(chafers,click beetle etc.),leaf beetles,longhorn beetles etc.,others are important natural enemies such as ground beetles,ladybird beetles etc..Some coleopterous species have phototaxis.The insect monitoring light trap was used to monitor coleopterous species with phototaxis in the Science and Teaching Experimental Station of Shandong Agricultural University so as to make clear the species composition and their population dynamics,the characteristics and the temporal pattern of coleopterous insect communities and to lay the theoretical basis for monitoring and controlling of coleopterous insect pests.The main research results were as follows:1.Seventy-five species of coleopterous insects trapped in the monitoring light trap,belonging to 21 families,were found,among which 22 species of herbivorous insect pests and34 species of natural enemies were included.2.Among the feeding functional groups of coleopterous insects trapped in the monitoring light trap,the relative abundance of the phytophagous taxa was highest,accounting for 97.99%,among the taxa the abundance of shining leaf chafers(Rutelidae)and cockchafers(Melolonthidae)was highest;the relative abundance of the predatory taxa ranked the second,accounting for 1.25%,among which the the relative abundances of predacious ladybird beetles,rove beetles and ground beetles was high.The relative abundance of other groups was low.3.The relationship between the number of species and the abundance of coleopterous insects(species-abundance relationship)was fitted to logarithmic series model,and the model is S = 7.8837ln(1-N/7.8837).4.The population dominance of the coloepterous insects trapped in the light trap was analyzed in temporal sequence,the dominant species of coloepterous insects were Pleonomus canaliculatus Falderman,Holotrichia oblita(Faldermann),Holotrichia parallelaMotschulsky,Anomala corpulenta Motschulsky,Harmonia axyridis(Pallas)and Galerucella grisescens(Joannis),respectively.5.The population dynamics of 5 species of chafers(Holotrichia oblita,Holotrichia parallela,Anomala corpulenta,Anomala exoleta,Maladera verticalis),Harmonia axyridis,Vibidia duodecimguttaia,rove beetles and ground beetles and Galerucella grisescens were analyzed in temporal sequence.6.Community characteristic indices such as species richness,ecological dominance,diversity and evenness in the coleopterous insect communities were analyzed.The richness of the coleopterous insect communities were higher,and the degrees of community diversity were low during the most time from April to September,affected by the climate factors(temperature and rainfall)and the abundance of main phytophagous insects,esp.Holotrichia parallela Motschulsky and Anomala corpulenta Motschulsky.7.The temporal patterns of the coleopterous insect communities in monitoring light trap were divided into four consecutive temporal periods by using the optimal sorting method,i.e.from the first 10 days of April to the last 10 days of May,from the first 10 days to the middle10 days of June,from the last 10 days of June to the first 10 days of July and from the middle10 days of July to the last 10 days of September.The species and the occurrence characteristics of coleopterous insects and the natural enemies during the four periods were analyzed.The dividing of the temporal patterns of the coleopterous insect communities in the monitoring light trap can provide a scientific theoretical basis for working out the control tactics of the coleopterous insect pests. |
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