It is usually normal for the tomato cultivation be affected by numerous diseases, pests and viruses; among these is the ascomycete fungus known as “would alternate“, Which consists of a decomposition that affects the appearance of the plant.
In this post, we will be talking about what what is tomato alternariathe symptoms it produces and its treatment, in addition to some other aspects about this fungus.
What does tomato alternaria mean?
Alternaria is a fungus that attacks different species, a polyphagous funguswhich has the ability to survive for 12 months In the remains of those tomato plants that are sick, it also presses the inoculum of the plants.
This fungus usually invade the tomato through growth cracks, injuries generated due to sun blows, insect bites and different blows. However, it is also possible that it does so directly through the intact epidermis of the leaves, stems and fruitsso it is necessary to act quickly, since once the alternaria is installed in the orchards it begins to wither everything.
What are the symptoms of tomato alternaria?
In general, the toggle appears on the lower leaves and progressively it spreads to the rest of the plantuntil completely affecting its leaves, stem, and even its fruits.
Both on the stem and petiole, dark wounds are generated with elongated shapes and concentric rings. In the tomato there are several brown spots that in some cases, have a yellow halo, which could cause the pinnae to dry out.
Those varieties that are of late ripeningtend to have a greater resistance to this fungus. However, from the moment of invasion of the alternariaUntil symptoms appear, it may take about 8-10 days, provided you are in optimal conditions.
What are the optimal conditions for alternaria to occur?
Those conditions that benefit the propagation of the alternarianormally they are the spread of the fungus through the wind, insects, water, agricultural machinery, etc. However, the spores sprout and they contaminate the leaves when they are humid, this is because the fungus is usually more active when faced with hot or moderate temperatures, as well as being in a humid environment; This is the reason why the risk increases significantly during the rainy seasons.
Likewise, it should be noted that the attack is usually worse whenever the plants are stressed due to the fruiting due to lack of nitrogen or under attack by nematodes.
How to combat tomato alternaria?
By the time the alternaria manages to invade the crop, it is not easy to control it; therefore, it is necessary inspect the crop at least twice a week in search of plants that present the symptoms caused by this disease, before beginning the application of any type of fungicide.
How should the application of the treatment be carried out?
The first step treating tomato alternariaconsists of the application of 15 liters of the previously mentioned fungicide (Daconil 50 SC) through a sulphating knapsack that allows spraying the product.
Subsequently, the application of Alexin fertilizerin order to protect and fertilize the soil in which the plant is located and to do so, for every 10-15 liters of water you must mix an envelope of fertilizer, and then pour it on the ground using a watering can.
After 3-4 days, it is necessary reapply Daconil 50 SC on those plants that have been infected by alternaria. If after a week the plant is still sick, a third and final application must be made of the product.
What plants does alternaria affect?
Apart from the tomato, the alternaria also affects the eggplant, potato and any other nightshade plant.