Which fungi transmits potato mop top virus?
The virus is transmitted by the fungus Spongospora subterranea in which it is likely to persistent for many years within cystosori (spore balls). PMTV cystosori can survive in soil for many years without potato crops.
How do potatoes control viruses?
The most effective means of controlling virus in potato crops is to grow resistant potato cultivars. This strategy allows potatoes to be produced in areas where aphid pressure is high and hence unsuitable for potato production because of disease.
Is potato mosaic a virus?
For the most part, mosaic viruses that infect potatoes are transmitted by aphids. They feed on the sap of infected plants and transmit the virus to healthy plants. Nearby weeds may also serve as alternate hosts for the virus. Potato tubers are probably the primary overwintering reservoir of these viruses.
What causes potato virus?
PVY is primarily spread by aphids, including green peach (Myzus persicae) and potato (Macrosiphum euphorbiae) aphids, as well as other species that migrate through the crop. PVY is transmitted non-persistently. This means when an aphid feeds on a PVY-infected plant, it picks up the virus within 1-2 seconds of feeding.
Which of the following is a viral disease of potato?
Disease Scenario
| S.No | Disease symptoms | Causal virus |
|---|---|---|
| 1. | Potato leaf roll | Potato leaf roll virus |
| 2. | Mild mosaic | Potato virus X |
| 3. | Yellow flecking | Potato acuba mosaic virus |
| 4. | Rugore mosaic | Potato virus Y |
How does ringspot virus spread?
Papaya ringspot disease is spread from plant-to-plant by aphids, which are small sap-sucking insects. There are many species of aphids that are capable of transmitting the virus.
What is potato virus Y symptoms?
PVY symptoms include yellow, light green and dark green “mosaic” patterns on leaves, leaf drop, brown or black (necrotic) line patterns often on veins or shoots, necrotic lesions on leaves and stems, rugosity (wrinkling), yellow flecking, stunted growth, death of growing points, tuber cracking and tuber necrosis.
What is genetic material of potato mosaic virus?
Purified virus possessed typical geminate particle morphology and encapsidated both genomic and subgenomic species consisting of single-stranded DNA.
How many potato viruses are there?
Seven viruses and spindle tuber viroid are recognized as important in the state from either a production or a seed certification standpoint. The viruses include potato leafroll virus, potato viruses Y, X, A, S, M, and alfalfa mosaic virus, with the first three being the most important.
How many types of known viruses commonly found in potatoes causing mosaic viral disease that can reduce tuber quality and yield?
11.2 Viruses of Potato. Whereas more than 50 different viruses and one viroid have been reported infecting potatoes worldwide (Table 11.1, Fig. 11.1), only a handful of them cause major losses globally.
Who first discovered virus?
In 1892, Dmitri Ivanovsky used one of these filters to show that sap from a diseased tobacco plant remained infectious to healthy tobacco plants despite having been filtered. Martinus Beijerinck called the filtered, infectious substance a “virus” and this discovery is considered to be the beginning of virology.