- 86
-
Black Walnut and Allelopathy
NC State University Coop Extension — Though grown primarily for its wood and nuts, black walnuts are often found growing on landscape sites where they serve primarily as shade trees. When certain other landscape plants are planted near or under this shade tree they tend to yellow, ...More…
-
Black Walnut
DCNR — LEAVES: Compound, alternate; leaflets 15 to 23, each 3"-4" long, small-toothed; dark yellow-green above, paler, hairy below. End leaflet absent or very small. Main leaf-stem with very fine hairs. TWIGS: Stout, orange-brown to dark brown, ...More…
-
Walnuts Causing Wilt in the Garden
NC State University Coop Extension — Walnut, especially black walnut (Juglans nigra) and butternut (Juglans cinerea), is associated with an often difficult-to-diagnose wilt of plants in the garden and landscape. Affected plants growing near walnuts are exposed to juglone, a toxin ...More…
-
JUGLANS INSECT PROBLEMS
Michigan State University Extension — Fall webworm larvae web over branches then feed on leaves Scales of various types attack walnuts. Identify the The leaves may be eaten by anyone of several caterpillars. These can be controlled with sprays once identified. Mites cause speckling ...More…
-
Walnut Diseases
Plant Pathology at Penn — Circular, brown spots with yellow halos form on the undersides of leaflets as the leaves reach full size. Leaflets yellow, brown, and fall prematurely leaving trees very bare by August. Tiny, brown, fungal fruiting structures form mostly along ...More…
-
W.M. BLACK
Growing black walnut in pure stands is becoming more and more common. Although this practice has definite economic advantages, it can aggravate disease problems. Three such diseases are...: walnut anthracnose, bull's-eye leaf spot, and white ...More…
-
Black Willow
DCNR — LEAVES: Alternate, simple, narrowly lance-shaped, very long-pointed, tapered or rounded at the base, finely toothed margins, smooth dark green above, pale green below. Conspicuous stipules (small leafy parts at the base of the leaf-stalk) ...More…
-
SALIX INSECT PROBLEMS
Michigan State University Extension — Aphids cause deposits of honeydew on lower leaves. Spraying large trees may not be necessary as predatory Imported willow leaf beetles (Vis. 1) are metallic blue and Lace bugs cause mottling and yellowing of the leaves. The insects are small, ...More…
-
Willow Diseases
Plant Pathology at Penn — Rough galls form on stems at the soil line or on roots. If the galls engulf the stem or root, that tissue will be killed. Remove severely affected trees. Do not replace them with herbaceous or woody plants susceptible to crown gall. Black areas ...More…
-
SALIX DISEASE PROBLEMS
Michigan State University Extension — Crown gall causes galls to form near the soil line or Willow scab attacks and kills young leaves within a Another fungus, Physalospora miyabeana attacks willow and Black canker is caused by Physalospora miyabeana and is Many fungi cause cankers ...More…
-
Salix purpurea
H&CS — Purple Osier Willow, Purpleosier Willow, Blue Arctic Willow, or Basket Willow Willow Family, with many potential diseases (including stem cankers) and pests, many of which are cosmetic in their damage and relatively minor, and generally overcome ...More…
-
Black Willow, Goodding Willow, Willow,Black
Samuel Roberts Noble Foundation — A small to medium-sized tree widespread along streams, flood plains, pond banks and other sites with wet soil. Easily identified by the finely saw-toothed leaf margins. Can be planted from rootstock or cuttings for erosion control. Native ...More…