Leaf curl disease
Viral disease
Wrapping papers
Rolled eggplant leaves indicate:
- Inadequate irrigation: The soil should be moistened as soon as the top layer dries.
- Nutrient deficiency: A teaspoon of ash under each plant will help get rid of discolored leaves.
- Excess fertilizer with little watering: When the soil is saturated with nitrogen, phosphorus and potassium and watering is poor, the leaves begin to curl and dry. In this case, fertilization is canceled and irrigation times are increased.
- Changes in soil temperature or moisture Which causes the leaves to curl.
Symptoms in the form of upward curling on new leaves.
Growth and yellowing of the spaces between the veins on the leaves.
Upward curling also appears on old leaves with
Dryness, brittleness, and purple discolouration of the lower surface.
Plant growth stops and the branches stiffen and point upward. •
In cases of severe infestation, productivity and marketing value decrease
Symptoms
Symptoms vary depending on the plant variety, environmental conditions, and type of infection. Initial infections caused by the transmitting aphids appear on young, newly growing leaves. The edges of the leaves begin to curl upward and dry
Yellowing appears on the green areas located between the veins of the leaf. But if
The infection occurred from seed tubers infected with a secondary infection, and symptoms appear
The infection on old leaves is in the form of a curl of the edges to the top
The leaves also become stiff and brittle, with a purple to red discolouration
On the lower surface of the leaves, while the newly grown leaves appear to have...
Edges curled upwards with pale green colouration. Growth also stops
The plant and the branches are stiff and point upward. As for severe cases of infection
This causes poor productivity and poor market value
Cause of disease
The first transmission of the virus occurs when the plant is infected and the aphids begin to feed on the infected plant, and the infection is transmitted from plant to plant during the season. Secondary infection occurs when plants grow from infected tubers. Aphids transmit the virus from one plant to another. The virus remains in the aphid's body and is transmissible throughout the insect's life, which increases the infectivity of the virus. In order for the insect to gain the ability to infect, the aphid must remain feeding for at least two hours on the plant. High soil moisture increases the risk of infection
Preventative measurements
You must use healthy seeds from reliable and approved sources.
It is also necessary to use varieties that can withstand injury, if any.
The field must also be monitored closely and continuously
And get rid of infected plants.
Host weeds and remnants of the previous crop, which may provide shelter for the virus and its aphids, must also be eliminated.
Symptoms appear in the form of discoloration of the leaf tissue between the veins to a dark red color in red vine species, while in yellow species it turns white, and the tissue appears to be wrinkled downward and the edges of the leaves are also curled.
It suffers from poor growth, with short canes and small branches.
Organic control
There is no direct treatment for viral infections, but controlling the number of aphids that transmit the virus using predators and parasitoids can be considered a preventive measure. You can use midges, aphids, and fighting beetles, as well as some types of mosquitoes and flies that can feed on aphids and their larvae. Parasitic wasps can also be used.
Chemical control
The use of integrated control methods, including preventive measures and biological control methods, should always be taken into consideration if available. There is also no chemical control for widespread viral infections. However, you can control the spread of aphids that carry the virus. Therefore, you can use the insecticide neonicotinyl in the early stages of plant growth
https://plantix.net/ar/library/plant-diseases/200008/potato-leafroll-virus/
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