Virus
Maize rugose dwarf virus (MRDV): what it is, how it originates, and how to eliminate it effectively.
Corn Rough Dwarf Virus (Mrdv)
Maize Dwarf Mosaic Virus (Mdmv)
Pathogen:
Virus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Maize Dwarf Mosaic Virus (MDMV) is a virus that belongs to the genus Potyvirus and mainly affects corn plants. This virus is transmitted by aphids, particularly the corn aphid (Rhopalosiphum maidis) and other insect vectors. Once aphids feed on an infected plant, they can acquire the virus and transfer it to other plants through their mouthparts. MDMV enters corn cells and uses the plant's cellular machinery to replicate and produce new viral particles. These particles move through the phloem, dispersing throughout the plant and infecting new tissues. Infection can lead to leaf mosaics, dwarfism and other deformations. In the final stage of infection, severely affected plants may show a notable reduction in grain yield and quality.
SYMPTOMS
Corn rough dwarf virus (MRDV) causes a disease that significantly affects corn, causing symptoms that impact the growth and development of the plant. The disease manifests itself with a series of visible symptoms that affect both the leaves and the general development of the plant, compromising the productivity of the crop.
- Appearance of chlorotic Taches and mosaics on the leaves.
- Dwarfism of the plant, with stems shorter than normal.
- Reduction in the size and number of ears.
- Roughness and distortion of the leaves.
- Necrosis in severely affected leaves.
- General loss of vigor and delay in development.
TEMPERATURE AND HUMIDITY
20°C - 30°C
60% - 80%
HOW IS IT SPREAD?
Aphids, infected seeds, contaminated tools, contact between plants
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
There are no effective treatments against viruses, the treatments are focused on combating the insect or vector carrying the virus (SEE AVAILABLE TREATMENTS AGAINST INSECTS)
Authorized treatments in organic farming
There are no effective treatments against viruses, the treatments are focused on combating the insect or vector carrying the virus (SEE AVAILABLE TREATMENTS AGAINST INSECTS)
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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- Use corn varieties resistant to MDMV to reduce the susceptibility of the crop.
- Implement an adequate crop rotation to avoid the accumulation of the virus in the soil and reduce the presence of alternative hosts.
- Control the aphid population through the use of specific insecticides and integrated pest management practices.
- Keep the field free of weeds that can act as reservoirs of the virus and vectors.
- Regularly monitor crops for early detection of the presence of the virus and vectors.
- Avoid planting corn near fields that have a high incidence of the virus.
- Apply cultural practices that promote the general health of the crop, such as balanced fertilization and adequate irrigation.
- Remove and destroy infected plants to reduce the source of inoculum and spread of the virus.
Recommendations
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