1. Black walnut tree
Black walnuts are often grown for their shade and edible nuts, but their buds, roots and nut hulls release significant levels of juglone, a chemical that robs sensitive plants of needed energy.
2. Bradford pear tree
The Bradford pear tree is sensitive to leaf scorch and fire blight, but branch splitting remains the biggest problem. Bradford pears are top heavy and have a v-shaped crotch, which makes them prone to splitting. It’s not uncommon for the Bradford pear tree to split in half, especially during sever weather.
3. Ash tree
The ash tree is a target of the emerald ash borer (EAB), a beetle once native to East Asia. Initially found in Michigan in 2002, EABs likely arrived via packing materials made of ash wood.
EABs threaten the more than 8 billion ash trees in the United States, where they’ve often been planted in residential settings due to their resistance to severe weather, diseases and pests. While nibbling by mature EABs can hurt foliage, the worst damage comes from their larvae, which feed on inner bark, thus disrupting water and nutrient transport.
Split bark, heavy woodpecker activity, leaf loss and water sprouts at the trunk are all signs of EAB infestation.
4. Ginkgo tree
Found on five continents, slow-growing gingko (
The problem comes in late fall, when female trees produce a putrid-smelling “fruit,” which sticks to shoes and can get tracked indoors. Because there’s no way to distinguish male and female varieties at the seedling stage, the ginkgo tree is plagued by the rotten byproduct.
If you really want a stink-free ginkgo tree, seek out Autumn Gold and Lakeview varieties, which are male-only.
5. Sweetgum tree
While it can be beautiful, especially in the fall, the sweetgum’s spiny brown balls, which come down by the thousand, are a major drawback. There are many ways the “gumballs” might cause injury. You can slip and land on them as they roll. Shot out of a lawnmower, they become a hazardous projectile. They also don’t rake easily, so you have to pick them up by hand, an unenviable task.
article courtesy : Angielist