Brown Granular Stuff Under Birch Tree
Q: There is brown granular stuff dropping underneath my birch tree. It turns to brownish red mud if it gets wet.
A: They are probably droppings from a big population of sawflies. They very much resemble caterpillars but instead are the children of the dusky birch sawfly, a wasp-like insect. Since they are not caterpillars, products containing Bacillus thuringiensis won’t kill them. Imidacloprid is a systemic insecticide that can be applied to the soil around the tree in early spring before feeding activity is noticed.
-
-
-
1
Alberta Spruce – Dying
-
2
Rose Trees – Winter Care
-
3
Truffle and False Truffle – Identification
-
4
Hydrangea – Root Rot
-
5
The Issue With “No Mow May”
-
1
Yellownecked Caterpillars – Identification
-
2
Grass – Mixing Fescue and Rye
-
3
Rose – Pruning Climbing Types
-
4
Geranium – Overwintering
-
5
Fatsia – Blooming in December
-
