What is Corylus?
Corylus is a genus of plants that is part of the Betulayae family. It contains about 15 species of shrubs and trees that come from the northern mild areas of Europe, Asia and North America. Most of these plants, commonly known as Havils, have clusters of yellow flowers and edible nuts. Landscapes plant trees and shrubs in this family as individual samples or border shrubs. A common problem associated with the cultivation of these plants is pests. It describes the shape of the walnut shells. Most species in this family have changes in common name, Hazel. For example, Corylus Colurna is called a Turkish hazel hazelnut, while the Contotort variety Corylus Avelana is commonly referred to as CORKSCREW hazel layer.
Hazel shrubs and trees are found in deciduous forests on three continents. Corylus yunnanensis is native to Central and South China, while Corylus maxima is distributed from the Balkans to Turkey. Corylus Americana fills the eastern halfwell Canada and the United States. The leaves are green and become yellow during the fall. In the summer, clusters of sweet nuts develop. They have an oval shape and have green peels.
Most hazel trees develop clusters of flowers called catkins in front of the leaves. Catkins are shaped as a tube or cylinder, connecting with flowers along a single decreasing stem. There are men and female cats. On hazel trees, the male cat is usually yellow, while the woman is red and shorter.
Trees are usually planted in a well -drainage, fertile soil that has an alkaline pH. Tolerates clay or sandy soil. The tree can be pepperized in an area that is exposed to direct sunlight or partially overshadowed.
Several insects feed on leaves, flowers and nuts of the tree tree tree, including aphids, caterpillars, bile mites and saws. Adult saws feed on pollen, while the larva feeds on leaves. Gall miteThey also produce round, brown balls of organic matter on branches. Each bile contains colonies of small insects. Aphids also leave noticeable signs of contamination - Honeydew.
Honeydew is a sticky rest that attracts mold spores. If they are not treated, whole branches are afraid in black soot. Treatment of affected branches with insecticid soap and fungicide reduces the chance of infestation of insects and mold growth.