Arthropod Community Research On Canola

Canola is an important oil crop of traditional advantages. In addition, with the increasingdepletion of non-renewable resources of coal, oil and other resources, canola has a potential to be anenergy crop. Aphids of cabbage, cabbage butterfly, pea leaf miner, flea beetle, diamondback moth andso on are the most important pests in our province. In order to fully play the role of natural predatorsin pest control, and to reduce pesticide use.Through this experiment, I studied the communitystructure and temporal dynamics, understood the main pests and their natural enemies.The main results are as follows：1.Surveys show that45species of herbivore,15species of predators,3species of parasitoids,and3species of others have been found on canola in Yangling,Shaanxi. Flea beetle is the major pest ofcanola in early spring (late March to early April) in2013.2.In late April, leafminers are the main pest, which reached its peak in the mid-May,thendeclined; After May,Aphids become the main pests until harvest.3.In the early growth of canola, there were few natural enemies, the mainly natural enemies areladybugs; In the flowering, more natural enemies were present, including ladybugs, hoverflies,lacewings and other predators. In pod period to maturity, the main natural enemies in the field areladybugs, hoverflies and parasitic wasps.