Kangas joined Nightly Business Report in 1979; in 2003, his Stocks in the News segment earned a Financial Writers and Editors Award from the Medill School of Journalism at Northwestern University. In 2005, he won a Suncoast Chapter Silver Circle Award.
What Is a Malpighian Tubule? Malpighian tubules are organs within insects that excrete solid waste. Larvae of certain species of beetles use Malpighian tubules to produce silk.
As the larvae tunnel in the conductive tissue of the tree, they interfere with sap flow and destroy the cambium. Some of the sawyers, longhorned beetles, can carry the pine wilt nematode that compounds injury to the tree. Many pine borers carry fungi and increase the susceptibility of the host tree to these pathogens.