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.
Caterpillar-Like Sawfly Eat Evergreen Needles. Christmas Tree Pest Manual (USFS) Comandra Blister Rust (USFS) Diplodia Blight of Pines (USFS) HOW to Identify and Control Diplodia Shoot Blight, Collar Rot, and Canker of Conifers (USFS) Disease Management Recommendations for Trees and Shrubs. (Brown Spot, Dothistroma Needle Blight, Lophodermium Needlecast, Pine Needle Rust, Pine-Oak Gall Rust- eastern gall rust, Pine-Pine Gall Rust- western gall rust, Shoot Blight, and White Pine Blister Rust)