,  Aphids & Cinchbugs   Some Introduced Species Pg 167 Quack grass Thistles Chickweed Dandelions European bark-boring beetle - I think this is the correct beetle ! Dutch elm disease  (fungus)    Controlling Pests Ploughs Cultivators Crop Rotation Summer Fallow Chemical Control:  Herbicides ,  Insecticides and  fungicides Bioaccumulation of Chemicals Soil