You are here. Cross U.S. Borders. Almost a million times each day, U.S. Customs and Border Patrol (CBP) officers welcome international travelers into the U.S. In screening both foreign visitors and returning U.S. citizens, CBP uses a variety of techniques to assure that global tourism remains safe and strong.
Reaching heights between 40 and 70 feet, the river birch is one of the hardier birch trees. They grow best in full to partial shade and thrive in well-drained, slightly acidic soils. The river birch is not a drought tolerant tree, preferring sites that are wet.aper Birch (Betula papyrifera). Paper birch trees are large, oval in shape and may be single or multi-trunked. They reach heights between 50 and 70 feet. Younger trees have brown bark, as trees age the bark turns white and peels to reveal an inner bark that is orange in color.
There are several damaging birch tree diseases and pests. Some of the most common are: Bronze Birch Borer â This potentially lethal pest can be difficult to control in birch trees. It is an invasive wood-boring beetle whose larvae bore into the layers of the tree and interrupt the flow of sap.