Study On The Ecology Of Insect Community In Peach Orchard

From May 2018 to October 2019,this study systematically investigated the structure and dynamics of insect community in the south cliff palace peach garden of zhanghe village,a town attached to Lingchuan county,Jincheng city.It found out the structure and composition of insect community,the functional groups,temporal dynamics,diversity and beneficial relationship of insect community.The findings are as follows:1.Abundant insect community peach orchard.In 2018,77169 insects were collected in this peach garden,which belong to 12 mesh,99 families,341 species;in 2019,55680 insects were collected,which belong to 11 mesh,96 families,304 species.The dominant groups were Diptera > Hymenoptera > Lepidoptera > Hemiptera.2.Distribution of functional groups of insect communities in different years of the same habitat is different.The results showed that in 2018,there were 146 insect species,108 natural enemies and 42 neutral insects;49.32% of pests,36.48% of natural enemies and14.18% of neutral insects;71.95% of total insect population in peach orchard,15.12% of natural enemy insects and 12.91% of neutral insect species.In 2019,there were 157 pests,104 natural enemies and 44 neutral insects;the proportion of pests was 51.47%,the proportion of natural enemies was 34.09 %,the proportion of neutral insects was 14.42%,the number of harmful insects in peach orchard was 61.59%,the proportion of natural enemy insect species was 22.96%,and the proportion of neutral insect species was 15.44%.The insect community of peach orchard was relatively stable in two years,and the species and number of insect pests in peach orchard in 2019 was higher than that in 2018.The main reason is that the diversity of insect community in orchard was low caused by early spring freezing injury and summer hail in 2018.of biodiversity and stability.3.Analyzed the variation law of time series in peach orchard on two surveys in 2018 and 2019 based on the longitudinal and transverse ratios of species richness(S),number of individuals(N),S hannon-weiner diversity index(H’),impson dominance index and Pielou uniformity index,and analyzed and divided the dynamic changes of insect communities over two time periods.The insect community of peach orchard was stable in 2018,and the sinmpson index of peach orchard in May was 0.9817,s.hannon diversity index was 2.5316,evenness was 0.5325,dominant species was 186 Yuan toilet flies,dominance index was0.0797;after flowering period,chemical control was carried out several times,so that the number of insects in this period was less.Peach orchard in June,the shannon diversity index of 2.14616,the evenness of 0.4119,the dominant species is 2363 drosophila melanogaster,the dominance index of 0.2302;peach orchard fruit is not yet mature,but also appeared a part of the tender fruit attracted a part of the Drosophila melanogaster reproduction sinmpson index is.0.98.7.8.In September,as the fruit of peach orchard ripens,Drosophila porphyra also reached a rapid growth trend,but the large number of small bees of fly pupa also inhibited the reproduction of harmful insects.The sinmpson index of peach orchard in October was 0.9918,the shannon diversity index was 0.33067,the uniformity was 0.0723,the dominant species was 158 Drosophila melanogaster,the dominance index was 0.0922;in October,the artificial chemical control not only killed harmful insects,but also natural enemies and neutral insects,which led to the final dominance and diversity.the index shows the lowest phenomenon.The sinmpson index of Taoyuan in May 2019 was 0.9598,the shannon diversity index was 2.5078,the uniformity was 1.165,the dominant species was 168 Yuan toilet flies,and the dominance index was 0.0869.After the flowering period,chemical control was carried out many times,which made the number of insects in this period less.The sinmpson index of peach orchard in June was 0.9859,the shannon diversity index was2.04322,the uniformity was 0.9377,the dominant species was Drosophila melanogaster 7115,and the dominance index was 0.502 As the temperature rises early and the precipitation increases,the fruit of peach orchard ripens partly,but also some tender fruit attracts a part of black-bellied fruit flies to reproduce.7.8.In September,as the fruit of peach orchard ripens,Drosophila porphyra also reached a rapid growth trend,but the large number of small bees of fly pupa also inhibited the reproduction of harmful insects.The sinmpson index of Taoyuan in October was 0.995,the shannon diversity index was 0.661,the evenness was 0.159,the dominant species was 83 flies,and the dominance index was 0.171;in October,through artificial Chemotherapy not only kills harmful insects,but also natural enemies and other insects,which leads to the lowest data and performance of the final dominance and diversity index.4.Through two years of investigation and study of harmful,beneficial and neutral insects in Taoyuan optimal population change trend,combined with meteorological factors analysis of the causes of population change,to formulate ecological control strategy in Taoyuan.In the study results,when the benefit-to-harm ratio is 30%,the control method based on chemical control,agricultural control,physical control and biological control is adopted.When the benefit-to-harm ratio is greater than 45%,the control strategy is based on agricultural control,physical control,biological control and chemical control.The ecological prevention and control strategies of Taoyuan in each period are formulated according to the benefit-benefit ratio of different periods.