Latent virus is the usual garlic belongs to the genus Carlaviruses which plants are natural hosts.
Carlaviruses can cause serious harm garlic especially in conjunction with potyvirus
- Garlic common latent carlavirus
- Spanish: Virus latente común del ajo
Garlic latent virus
GARCLV or GCLV
Other viruses of the genus Carlaviruses that affect garlic
- Shallot latent carlavirus (SLV)
A sinuous filiform body measuring 0.0005-0.001 mm.
The first report on the identification of this virus in garlic – 1993 The Netherlands, Van Dyke.
Geographical distribution of latent viral ordinary garlic
Scientists mention latent virus plain garlic as one of the most common viruses that affect the harvest garlic.
Here are some data on the spread of latent virus usual garlic:
- Argentina (study 2015), the virus was detected in all regions surveyed growing garlic but the percentage of disease was relatively low – from 6.7 to 22%
- In Mexico, the presence of the virus was detected in 32.3% of investigated cases (Pérez-Moreno etc., 2007).
- In Italy, recorded the virus in the range of 23 to 28% (Dovas & Vovlas, 2003).
- In Greece, the values were very different incidence among selected regions. 98% of infected plants were found in Arcadia and 18% in Evia with low or no presence of virus in Yevrose and Thessaloniki (Dovas et al, 2001)
- In the Czech Republic, a high incidence were found in the Czech varieties ranged from 98.9% to 100%, and various interest in imported material from 0% in material of garlic from China and 85.7% in varieties from Spain (Klukácková etc., 2007)
- In Iran GarCLV was detected in only one of the ten regions analyzed with 15.8% of positive samples (Shahraeen etc., 2008).
From the name of the virus ‘latent’ implies that, as a rule this virus has no obvious symptoms.
In primary infection the formation of light mosaic on the leaves of garlic.
As usual latent virus is transmitted garlic
Transfer of insects
The virus is transmitted by aphids. Stiletto way. This method means that the insect which feeds on infected plant; the virus contaminates their mouthparts and immediately (within 0.5-2 minutes) is able to transmit the virus to other plants. But a few hours later the possibility of infection disappears.
Those aphids which migrates from the affected fields virus to a healthy contagious for several hours.
Transfer of planting material
Given that garlic propagated only vegetatively infected plants transmit the virus to future generations. And given the fact that the virus is transmitted by insects, it could be assumed that after years of industrial cultivation of garlic, garlic all around the world will be infected by viruses.
However so far so happens. In some countries or regions GarCLV virus contamination is low enough.
The reasons are not yet clear. It is assumed that the value of having certain features and climatic conditions of life of insect vectors of virus in specific regions.
As the virus spreads plant
Once the virus enters the plant tissue it pops up first on the veins, then the leaf petioles and finally enters the stem. In principle, the virus can spread throughout the plant.
Transfer of the virus over long distances occurs in plant tissues (phloem, xylem).
The rate of spread of the virus is about 1 mm per day. It is believed that the virus after it enters the cell multiplies it first and then enters the next.
Ways to control
- The use of virus-free planting material
- Analysis of the situation in the neighboring fields especially noting the willingness of aphid migration (the appearance of aphids with wings)
- Plant garlic barriers around fields – from planting corn
- Anti-insect vectors
There are not chemical methods of combating industrial crops of garlic.
The information was prepared by Andrew Marchenko