One of the most important diseases of cassava is cassava mosaic disease (CMD), which is transmitted primarily by the vector whitefly (Bemisia tabaci) (Chant 1958). CMD is the most important threat to cassava production in Zambia. The disease is prevalent in most cassava fields (Chikoti et al.
What causes African cassava mosaic virus?
The main disease affecting the crop is African cassava mosaic disease (ACMD) which is caused by any of the African cassava mosaic geminiviruses (ACMVs) that are transmitted by the whitefly Bemisia tubaci (Gennadius).
Which disease is caused for mosaic disease?
The cause of the disease is the Tobacco Mosaic Virus, or TMV, which was the first plant virus to be ever identified. Irrespective of its name, the ‘tobacco’ mosaic virus can infect over 350 species of herbaceous and woody plants.
Is Cassava mosaic virus A DNA virus?
These are the African cassava mosaic virus (ACMV) and the East African cassava mosaic virus (EACMV)-like, with high sequence similarity of 94% and 80%, respectively, between the DNA-A and DNA-B components of each virus, and 66% and 41% similarity of the common region (CR) (for A and B accordingly).
What disease affect cassava?
The two major diseases are the Uganda variant of the East African cassava mosaic virus (EACMV-Ug) and cassava brown streak virus (CBSV). These are just the latest in a long line of disease strains affecting cassava (1983, 1993, 1997, 2004).
What is the causal agent of cotton?
Patterns of Seed-to-Seedling Transmission of Xanthomonas citri pv. malvacearum, the Causal Agent of Cotton Bacterial Blight | Phytopathology®
What is the scientific name of cassava?
cassava, (Manihot esculenta), also called manioc, mandioca, or yuca, tuberous edible plant of the spurge family (Euphorbiaceae) from the American tropics.
What is mosaic formation in plants?
Mosaic formation is the presence of some light and dark green patches in the leaves of plants which is mainly caused by the viral diseases. Leaf rolling is curving the leaves of plants outwards. Due to some diseases the plant which is mostly green in color gets converted into the yellow color plant.
What is mosaic virus plants?
What Are Mosaic Viruses? Mosaic viruses affect more than 150 types of plants, including many fruits, vegetables, and flowers. The disease is characterized by leaves that are mottled with yellow, white, and light or dark green spots and streaks (in other words, a “mosaic” of these colors).
What is leaf rosette?
In botany, a rosette is a circular arrangement of leaves or of structures resembling leaves. In flowering plants, rosettes usually sit near the soil.
What does plum pox virus do?
When a host tree is infected by plum pox, the infection eventually results in severely reduced fruit production, and the fruit that is produced is often misshapen and blemished.
Is cassava a yucca?
Cassava, which is also known as yuca, is not interchangeable with yucca. The plants belong to different plant families: cassava belongs to the Euphorbiaceae family, while yucca belongs to the Asparagaceae. Cassava is cultivated for its root, a staple food in many cultures. Yucca is primarily an ornamental plant.
What are the symptoms of cassava mosaic?
Among them, cassava mosaic disease (CMD) is the most severe and widespread, limiting production of the crop in sub-Saharan Africa. CMD produces a variety of foliar symptoms that include mosaic, mottling, misshapen and twisted leaflets, and an overall reduction in size of leaves and plants (Figs. 2 and 3).
What is the meaning of cassava mosaic?
African cassava mosaic virus (ACMV), East African cassava mosaic virus (EACMV), and South African cassava mosaic virus (SACMV) are distinct species of circular single-stranded DNA viruses which are transmitted by whiteflies and primarily infect cassava plants; these have thus far only been reported from Africa.
What is the propagation of cassava?
Cassava is propagated by cuttings, by planting pieces of stem. The roots of cassava are not used for making a new plantation, and thus all the harvest can be eaten or sold. To make cuttings, choose stems 2 to 4 centimetres thick, from the strongest plants which are not diseased and which have already produced tubers.