Stains on tomato leavesare a frequently observed symptom, both on plants grown in the ground and under cover. Most often they are white, yellow or brown spots, or small spots that may be accompanied by other symptoms. They arise as a result of improper care, fertilization errors or an attack by a disease or pest. See how to identify the causes ofstains on tomato leavesand how to combat this phenomenon.
Stains on tomato leaves
White spots on tomato leavescan indicate many different causes. Therefore, it is important to carefully examine these spots and check for other accompanying symptoms.
Small, round,white spots on the leaves of tomatoes , quickly fusing together and the accompanying white, powdery coating, indicate that the plant is infected bypowdery mildew tomatoIt is a fungal disease that affects the leaves in the lower parts of the plant first, but moves up quickly, and a white powdery coating also appears on the stems, petioles and sepals. The development of powdery mildew is favored by high temperature and air humidity.
After noticing the first symptoms of the plant, spray against this disease. In crops on the plot, where we usually avoid the use of chemical pesticides, fortomato mildew controlwe can use Timorex Gold 24 EC, based on a natural tea tree extract and approved for use in organic farming .Against tomato powdery mildew, dose this preparation in the amount of 5-10 ml per liter of water. This amount can be sprayed on 10m² of tomato cultivation. Up to 4 sprayings are performed at intervals of 7-10 days. For best results, it is worth using Timorex Gold alternately with Topsin M 500 SC fungicide.
Whitish, necrotic spots on tomato leavesmay also indicate a more dangerous disease, which istomato bacterial cancerThe first symptoms of this disease are tomato leaves curling and drying out. Gradually, these symptoms include subsequent leaves on which a yellow-brown discoloration appears and the entire plant begins to wilt. There are brown or almost black streaks and sometimes also beige cankers on the stems and petioles. Unfortunately, in the case of tomato bacterial cancer, the infected plants must be completely removed by digging up the roots. They should be burned. The remaining ones should be sprayed with copper preparations, such as Miedzian 50 WP.Spraying is repeated every 7 days. In the case of crops under cover, it is also worth lowering the air humidity. After harvesting, the entire crop must be removed and the tunnel, greenhouse and tools disinfected. To prevent the disease from recurring, it is best not to grow tomatoes for at least 3 years.
Very oftenwhite spots on tomato leavesare also the result of pest feeding. If small, whitish, round spots form on the upper surface of the leaf, usually at the leaf edges, this may indicate feedingnightshadeThis is a fly, the larvae of which feed on the leaf's crumb. As a result of their feeding, single, narrow corridors called mines appear on the leaves. As the larvae mature, the number and size of the mines on the leaves increases, and with severe damage, the leaves die and fall off the plant easily. Mospilan 20 SP can be used tocontrol tomato leaf minersby dissolving a 2.4 g pack in 6 liters of water.Spraying should be repeated after 7-10 days. Do not spray more than 2 times during the growing season.
Stains on the leaves of tomatoesmay also be the result of feeding on one of the two species of thrips. Irregular, several millimeters,whitish spots on tomato leaves , which turn beige as they age, may indicate that Western thrips are feeding. Usually, the droppings of this pest are visible around the spots in the form of black, shiny and slightly convex dots. Quite similarsilvery white spots located along the main veins of tomato leaves , with time covering the entire leaf surface, are the result of feeding on tobacco thrips. Infected leaves turn yellow and die over time. To combat thrips, as in the case of leaf miners, the already mentioned Mospilan 20 SP can be used. If we want to avoid chemical pesticides,thrips on tomatoescan also be combated with the natural Agrocover preparation.
Yellow or brown spots on tomato leavesmay indicate feedinggreenhouse spider miteThese spots appear on the upper side of the leaves, they can be oblong, of various shapes and sizes, but always with a darker center. Tiny red pests can be seen from the bottom of the stained leaves. Forfighting spider mitesyou can use Karate Zeon 050 CS, which should be dissolved in the proportion of 4 ml of the agent per 10 liters of water. Another possible measure will be the abovementioned Agricolle.
Yellow spots on tomato leaveswhere you can see a gray-brown or purple velvety coating on the underside of the leaf, and indicate that the tomatoes are affected by disease -tomato leaf blotchThese stains turn brown and increase in size over time. This disease affects the leaves in the lower part of the plant first. After noticing the symptoms, start spraying the plants every 7-10 days with Topsin M 500 SC, dissolving 1.5 ml of the agent in a liter of water.To improve effectiveness, use alternately with Amistar Opti 480 SC (dissolve 2.5 ml of the agent in a liter of water).
Yellowish or gray-brown spotswith a characteristic fluffy , gray fungus bloom, testify toinfection of tomatoes by gray moldIt is one of the most common fungal diseases of plants in gardens and allotments. Infectedtomato leaves dry , and the stems develop greyish or brownish spots of various sizes, quite slowly growing, covered with fungus coating. In the advanced stage of the disease, the stem under the spot becomes hollow. It also rots the fruit. To reduce the spread of gray mold on tomatoes, remove infested parts of plants and entire plants, ventilate greenhouses and tunnels to reduce air humidity, and do not spray the entire plants while watering (water directly into the ground). Control is the same as fortomato leaf spot In addition to the above-mentioned Topsin and Amistar agents, it is also worth using the Switch 62.5 WG agent against gray mold on tomatoes (dissolve 10g of the agent in 10-12 liters of water, which is enough for spraying 100m² of the crop).
Dark brown, round or slightly angular, nerve-limited spots on tomato leavesmay indicate that the plant is infected by alternaria. This disease affects ground tomatoes, especially in years with warm and humid weather, while in greenhouses and foil tunnels it occurs much less frequently.Spots initially appear on the lower leaves , then also include those located higher up, as well as the stems and petioles. Alternariosis also affects fruit, on which dark brown or black, leathery, slightly recessed spots appear. Mythos 300 SC, Ridomil Gold MZ Pepite 67.8 WG and Signum 33 WG are recommended for fighting this disease. The measures are best used alternately at intervals of 7-10 days.
Irregular brown or black circular spots on tomato leavesindicatebrown leaf spot An additional symptom of this disease is leaf curling to the edge and severe inhibition of growth. It is a viral disease and infected plants must be removed. Viruses can be transmitted by the previously mentioned thrips, so in order to preventtomato leaf spot , it is very important to combat these pests.
On tomato leaveswe can sometimes seetiny black spots with a yellow borderThese may indicatebacterial mottling of the tomatoThis disease is quite common in field cultivation, but it is relatively rare under cover. As a result of the infestation of tomatoes with this disease, irregular, small, initially watery and dark green, later dark brown and black spots, surrounded by a yellowish border, appear not only on the leaves but also on the shoots, petioles, peduncles and calyx sepals. On the fruits appear very small, black, mottled spots, 1-2 mm in diameter. Infested plants should be removed immediately and burned.In order to limit the spread of this disease to other, still he althy tomato bushes, you should refrain from sprinkling the plants during watering (irrigate only to the ground) and carry out all cultivation and harvesting works when the plants are dry. In periods of warm and humid weather, spray the plants with copper preparations, such as Miedzian 50 WP, every 7-10 days. Both preventively and in intervention, it is also worth spraying the plants with a preparation based on grapefruit extract - Grevit 200 SL.
Finally, one morecause of leaf stains ontomatoremains to be discussed, which is potato blight.Symptoms of potato blight on tomato leavesare initially gray-green, later brown or black spots, quickly spreading over the entire leaf blade and dying off infected leaves. A white coating of the fungus may be visible from the underside of the leaves. Potato blight on tomatoes also affects fruit. To combat this disease of tomatoes, preparations such as Miedzian 50 WP and Acrobat MZ 69 WG are used.Both of these measures can be used both in cultivation in the ground and under covers. Additionally, in the cultivation of tomatoes under cover, when fighting potato blight, you can use Amistar Opti 480 SC, and in field cultivation, Amistar 250 SC.
Listed in the articlemeans of protection against diseases and pests of tomato leavesyou can order in our store. We guarantee high-quality products, efficient service and shipment within 24 hours. (which is important when your plants are already sick andyou need to spray quickly ). To go to the store, press the button below: -)
"border=0
