Trees Under Attack

How many life forms can you find taking advantage of trees? What external features of trees encourage/discourage opportunisitc life forms?

Read Peterson on leaf folders,etc[249-52]; galls[252-7] How many different kinds of these various insect defenses can you find? On what plants do they occur? Can you indentify any of these insects; do different insects prefer different plants? What kinds of defenses can you enumerate? What materials do the insects use? Which are solitary? Which are communal?

Plant Defenses[149-52] Describe at least 5 mechanical plant defenses that you notice about Post. Try to determine what sort of herbivore the plant is discouraging, what sort would ignore the defenses. Look for: thorns, hairs, thick bark, thick leaves, water traps, etc.