In polymer chemistry, polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks. There are many forms of polymerization and different systems exist to categorize them.
The thistle caterpillar is the larval stage of the painted lady butterfly. The adult insect migrates into Iowa each year from Texas and Mexico. Eggs are laid on both thistle and soybeans. The caterpillar is easily identified by the spines that resemble Christmas trees that have lost all their needles.
Damage. The eastern tent caterpillar normally favors black cherry, choke cherry, scrub apple trees and many species of ornamentals in the family Rosaceae. When numerous, the insect defoliates many other fruit trees as well as deciduous forest and shade trees including birch, oak, willow, poplar, and beech.amage. The eastern tent caterpillar normally favors black cherry, choke cherry, scrub apple trees and many species of ornamentals in the family Rosaceae. When numerous, the insect defoliates many other fruit trees as well as deciduous forest and shade trees including birch, oak, willow, poplar, and beech.