| Carya illinoinensis as its important nutrition,health care,social economy and ecological value,it was popularized and planted in Wenshang County,and its area increased year by year.By using the conventional methods of insect ecology and sampling survey method,the main pests and natural enemies on C.illinoinensis in Wenshang County were investigated and studied.Counting the types and numbers of main pests and natural enemies,the species composition was determined and the relative abundance was analyzed.The dominant species of main pests and natural enemies were determined by calculating the population dominance of main pests and natural enemies.The population dynamics of main pests and natural enemies on C.illinoinensis in Wenshang County were analyzed by plotting the population dynamic curve.DPS data processing system was used to calculate species richness,ecological dominance,principal component and diversity index and to analyze the community characteristics of pests and natural enemies.The time pattern of main pests and natural enemies on C.illinoinensis was determined by the optimal sorting method of the survey time.This research provides a scientific theoretical basis for further utilizing the knowledge of insect ecology,scientifically protecting the living environment of natural enemies,inhibiting the growth and reproduction of pests,exploring green control technologies,and ensuring the planting and production of C.illinoinensis in Wenshang and Shandong areas.The main research results were as follows:1.The species composition of the main pests and natural enemies on C.illinoinensis in Wenshang County was determined by sampling investigation.It was found that there were 24 species,belonging to 2 phyla,3 classes,10 orders,19 families,of which 13 species were pests,accounting for 54.17% of the total number of species,and 11 species were natural enemies,accounting for 45.83% of the total number of species.Through the proportion calculation and relative abundance analysis of various groups of main pests and natural enemies,the species with high relative abundance of main pests were identified as stingerfeeding pests,lepidopteran leaf-eating pests and underground pests.The relatively high levels of natural enemies include ladybirds,lacewings,spiders,predatory mites,and hoverflies.The results showed that there were fewer pest species on C.illinoinensis in Wenshang County,and it was suitable for popularizing and planting.Some natural enemies followed well with pests.2.According to the analysis of species dominance,the dominant species of the insect pests on C.illinoinensis were: Kurisakia sinocaryae,Myzus persicae,Holotrichia parallela,Holotrichia oblita,Latoia sinica,Bemisia tabaci,Hyphantria cunea and Stink bugs.The dominant species of natural enemies were Propylaea japonica,Chrysopa pallens,Eupeodes corollae,Araneus ventricosus,Anystis baccarum and Pica pica.3.The analysis of community characteristic indexes,such as species richness,diversity,and evenness showed that the species richness and diversity of communities in Wenshang County gradually increased during the C.illinoinensis leaf development period.After the leaves stopped growing,the diversity index decreased.With the increase of temperature,the species and number of pests increased,the species richness and diversity of community increased again and reached the highest point.Through principal component analysis,the important role of major pests and their natural enemies in the community of C.illinoinensis was further studied.4.Based on the data processing by the ordered sample optimal segmentation method,the time pattern of the main pest and natural enemy communities on C.illinoinensis was divided into four periods,as follows: May 9-June 13,June 20-August 8,August 15-September 26,October 3-November 14.The species and occurrence regularity of main pests and natural enemies in each period were determined. |
