Teak

Teak is a kind of high-quality timber trees. A large tree, straight-trunked, it can grow to 30-40 m. high Large leaved, which disintegrate in the dry season.

Teak is known world by the name of teak (English). The name comes from the word thekku (തേക്ക്) in Malayalam, the language in the state of Kerala in southern India. The scientific name is Tectona grandis teak L.f.

Teak can grow in areas with rainfall 1500-2000 mm / year and temperature of 27-36 ° C both in the lowlands and highlands. [1] The best place for growth teak is the soil with pH 4.5 - 7 and not flooded with water. [2] Teak has a wide elliptical leaves and can reach 30-60 cm in adulthood. [1]

Teak has a slow growth with low germination (usually less than 50%) which makes the propagation process naturally becomes difficult so it is not enough to cover demand for teak wood. [3] Teak is usually produced conventionally by using seeds. However, production of seeds with large amounts within a certain time to be limited due to the outer layer of hard seeds. [3] Several alternatives have been made to overcome this layer such as soaking the seeds in water, heat the beans over low heat or hot sand, and add an acid, base, or bacteria. [4] However, these alternatives are still not optimal to produce identity in a fast and large numbers. [4]

Generally, teak seedlings are in the process vulnerable to several diseases including leaf spot disease caused by Phomopsis sp., Colletotrichum gloeosporioides, Alternaria sp., And Curvularia sp., Leaf rust caused by Olivea tectonea, and powdery mildew caused by Uncinula tectonae. [5] Phomopsis sp. is the most widely penginfeksi, recorded 95% seed infection in the year 1993-1994. [5] The infection occurs on seedlings aged 2-8 months. [5] The characterization of this infection is the presence of a light brown necrosis at the edge of the leaf which is then gradually spread to the midrib, the infection then spreads to the top of the leaf, petiole, and stem tip resulted in part from the stem leaves are experiencing drought. [5] If not recognized and are not controlled, infection of Phomopsis sp. will spread to the whole process of planting seeds so that identity can not be done. [5]

ref :
http://id.wikipedia.org/wiki/Jati