Birch trees , found throughout Canada and temperate regions of the United States , are graceful trees recognise for their beautiful white bark . They are also susceptible to a diversity of insects , some of which can kill a tree . Some insecticides will battle the insects most notorious for assail birch tree .
Bronze Birch Borer
The bronze birch rod borer , Agrilus anxius , is the most deadly worm to snipe birch tree trees , and it is the most difficult to see to it . The adult borer is a little , bronze - color mallet up to 2 inch long . Its eggs , laid on the bark , turn into larvae that eager into the vascular tissue paper in the barque and the tissue paper between the bark and the Sir Herbert Beerbohm Tree . This tunneling by larvae interrupt the stream of the sap , weakening and sometimes killing the tree . From egg to overhang the alive cycle of the bronze birch borer call for one year . The pennant will commence to thin beginning at the top . A birch will die after two or three eld of infestation .
The white-haired birch and the European white birch rod are most vulnerable to the bronze birch tree borer ; the canoe and river birches seem better able-bodied to jib .
Researchers at the University of New Mexico recommend insect powder containing bendiocarb , chlorpyrifos , and dicrotophos permethrin , used according to manufacturer ’s directions .
Birch Leafminer
The birch leafminer ( genus-Fenusa pusilla ) lays eggs in twat on the top of birch tree leaves in April to mid - May . The larvae , little milklike grubs set out feeding in May or June stimulate disastrous splotches on the leaves . The folio will at long last turn brown and fall off . In June or July the larvae pearl to the solid ground where they morph into sawflies , small , calamitous insects that search like flies . The adults lie more eggs in a hertz that can repeat four times in a grow season .
Horticulturalists at the University of Minnesota urge spraying insecticides arrest acephate or dimethoate on the leaf or applying undiluted dimethoate to the bark when the buds are breaking in the spring .
Oyster Scale
Oyster scale have no eye or leg . The insect moves only once during its life oscillation ; that it is in the spring when the nearly invisible nymph go forth from the female shell to taint new areas of the tree . They make small brownish bumps that reckon like oyster case . They suck sap and nutrients from a Sir Herbert Beerbohm Tree and over time can make dieback in a birch tree tree diagram .
Spray horticultural oil colour on the tree in late winter before the buds start out to give way in the bound . The horticultural oil choke the scale . If you see fawn houri , Birch-tree.com recommend spraying the trees with a spray containing pyrethrin .
Aphids
A birch tree can defy small numbers racket of aphids – little , pear - shaped insects also promise industrial plant lice . Large populations of aphids can lactate the sap from birch tree leaf , induce puckered marks on the leaves , turning them chicken and make them twist . This can eventually result in falling leaves and dieback of branchlet and branches . As they consume , aphids excrete a marrow called honeydew melon that pull ants .
The Insect Diagnostic Laboratory at Cornell University recommend insectical soap , horticultural oil or insecticides hold cyluthrin or permethrin .
