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.
Biology of Thistles. There are 150 species of thistles worldwide, with 20 species in the UK. The two most common and damaging are creeping thistle â Cirsium arvense â and spear (Scotch) thistle â Cirsium vulgare.Creeping Thistle (Cirsium arvense): a perennial that grows from seed or from root sections in the soil.iology of Thistles. There are 150 species of thistles worldwide, with 20 species in the UK. The two most common and damaging are creeping thistle â Cirsium arvense â and spear (Scotch) thistle â Cirsium vulgare.