Tomatoes

What causes leaf curl on tomato plants?

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2012-06-20 18:09:16
2012-06-20 18:09:16

Environmental stress from bouts of cool rainyweather, herbicide damage, severe pruning, sucking insects and viruses tend to cause tomato leaves to curl.

Yo-yo watering and severe pruning may cause a tomato plant temporarily to develop thick, leathery leaves that curl upwards. In this case, the plant shows no effects on flowering, fruiting or growth. The plant should re-adjust within the week.

Herbicide damage, particularly from 2,4-D, may cause tomato leaves to curl first downwards and then upwards. In this case, the plant may show such effects as cat-faced fruit, stunted growth and twisted leaves. If the exposure is mild or minimal, such effects aren't seen, and any damage will be outgrown.

Herbicide damage may take place a couple of days after the original lawn treatment. It also may occur if the treated lawn is mowed and the clippings are used as mulch.

Sucking insects such as the sweet potato whitefly[Bemisia tabaci] may remove the nutrient-filled products of photosynthesis from a tomato plant. That's why the leaves that they so attack end up yellow in color and deformed in appearance.

Insecticidal soap is an organic control to the pest while an insecticide with the active ingredient esfenvalerate is a more potent control that yields more immediate effects. Insecticidal soap may be used up to the day before harvesting the fruit. With esfenvalerate there must be a day wait between the treatment and the harvest.

Viruses may cause a tomato leaf to cup first downwards and then up. The most recent and most problematic is the Tomato Yellow Leaf Curl virus. It's transmitted by such sucking insects as the sweet potato whitefly, which should be treated as listed above in the paragraph. Accompanying damage to the rest of the plant depends upon when during the tomato plant's growth the virus is transmitted. So it's possible that flowers may or may not wither and that fruit may or may not set.

The presence of the virus is encouraged by such weeds as jimsonweed [Datura stramonium] and nightshade [Atropa belladonna]. As long as such weeds and such plants as the tomato share space, gardeners need to consider the possible continued presence of the Tomato Yellow Leaf Curl virus.

Leaf roll, or leaf curl, is a physiologic distortion that may develop with periods of cool, rainy weather. It cause the lower leaves to roll upward and become thick and leathery. Leaf roll does not affect plant growth or fruit production and requires no treatment.

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Tomato leaf curl can be caused by a variety of things of which bugs (usually aphids) are only one. Look at the underside of the leaves that are curling. If you don't see aphids, it will either be normal for the leaves to curl or you have a fungus/viral problem. Tomato leaves curl naturally if it's too dry, too hot, too humid or too windy. In other words, the leaves will tend to curl if growing conditions are not optimum for the plant. If it's too hot and dry, water more deeply. If it's too wet, water less frequently (make sure you water deeply though). You can tell if it's a viral or fungal problem by looking at the entire plant, especially the leaves. Tomato leaves differ in color dependent upon the plant. There are some varieties with deep green leaves and others have lighter green leaves. If the leaves are lighter in color than they should be for that variety of tomato, you probably have a viral or fungal infection. The same holds true if you have spotting on the leaves. Cut off a small branch and take it to your local nursery to see what they recommend for your area of the country.

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Related Questions


stunted plants leaf curl up as a cup shape hard leaf midrib yellow leaves

The tomato leaf curl virus is a yellowing and upward curling of leaves on a tomato plant. It is a viral infection that has been transmitted through whiteflies. It will affect fruit production.

roll the leaves the other way

tomato worms, also called hookworms or tobacoworms,are what eats the leaf of tomato plants.

Feeding, for instance aphids; leaf hoppers and rollers, and psyllids. Fungus, for instance nectarines and peaches. Spraying, for instance 2, 4 D drift; or Banvel or Roundup control reactions. Overwatering, for instance tomatoes. Viral, for instance mosaic virus; or squash or tomato yellow leaf curl virus.

slugs are harmful to plants because they eat them birds to. Fire blight can damage or destroy your plants leaf curl is just as harmful leaf curl makes leaves curl and fall off if you touch the plant that has it then touch another plant it will kill the other plant as well

Leaf curl is also a plant disease causing the curling of a leaf.

most likely aphids though there may be many reasons

A general answer ( since you did not specify what plant ) is insect damage, drought, or soil is too alkaline.

Tomato leaf curl can be caused by a variety of things of which bugs (usually aphids) are only one. Look at the underside of the leaves that are curling. If you don't see aphids, it will either be normal for the leaves to curl or you have a fungus/viral problem. Tomato leaves curl naturally if it's too dry, too hot, too humid or too windy. In other words, the leaves will tend to curl if growing conditions are not optimum for the plant. If it's too hot and dry, water more deeply. If it's too wet, water less frequently (make sure you water deeply though). You can tell if it's a viral or fungal problem by looking at the entire plant, especially the leaves. Tomato leaves differ in color dependent upon the plant. There are some varieties with deep green leaves and others have lighter green leaves. If the leaves are lighter in color than they should be for that variety of tomato, you probably have a viral or fungal infection. The same holds true if you have spotting on the leaves. Cut off a small branch and take it to your local nursury to see what they recommend for your area of the country.

The reason depends upon how the plant and its leaves look. [1] Some upward pointing may be natural, in response to light and sun. This is ka phototropism. [2] Other upward pointing may be pathological, in response to stress. One such stress is the tomato leaf curl virus. It's spread by whiteflies. An organic control for whiteflies is pyrethrum. A synthetic control is esfenvalerate. [3] In terms of the virus, there are images on the Internet. Just google tomato leaf curl virus.

A number of plant viruses occur: potato yellow dwarf, cherry leaf roll, tobacco-tomato mosaic (if you smoke wash your hands before handling tomato plants), and beet curly top are a few. Some viruses of plants don't harm them. One causes streaks of different colors in tulips.

first of all tomato is not a tree, but the leaf arrangement of a tomato is very wide. there are leafs who are dropping, other leafs are erect, the most hybrid tomato (cultivate tomato) have straight leafs. Leafs on tomato are almost a fingerprint, there are many variations!

Tendrils are a type of modified leaf. They are used by plants like Pea, to climb up other plants and objects. They are have a tropic response in that they respond to touch, which makes them curl around.

Tap water can affect plants because some tap water may have excess salts that can prevent the roots from absorbing nutrients and enough water. Chlorine and fluorine can curl leaf edges and produce leaf spots and singeing.

Tomato plants can be pruned by removing the "sucker" stems that grow between the main stem and the side stem. You will notice they look like a small leaf that starts growing into a stem. It comes out at a 45 degree angle and is easy to spot.

Cassava Leaf extract as acid-base indicator. Dried papaya leaves as organic mulch for tomato plants.

No, they are poisonous. The only edible part of the plant is the tomato(fruit).

Hydrophobic plants are plants which have leaves which repel water. This causes the water tension to increase, so a sort of 'bubble' of water is formed on the leaf surface.

Cold weather can cause citrus leaves to curl and so can water stress. Aphids are another cause.

A potato is not a leaf. The part that you eat called a tuber. It grows underground. The potato plant does have roots, stems, and leaves though, like almost all other plants. Their leaves look very similar to a tomato plant, actually, except that they don't have a strong smell like the tomato does.

'La cloque' is a French equivalent of 'leaf curl'.The feminine singular definite article 'la' means 'the'. The feminine noun 'cloque' in the singular means 'blister'. Together, they're pronounced 'lah klohk'.

Invertebrates and vertebrates are the animals that eat tomato plants. Examples of invertebrates include aphids, blister beetles, cutworms, earwigs, flea beetles, horn-worms, Japanese beetles, leaf-footed bugs, leaf-hoppers, nematodes, potato beetles, slugs, snails, stink bugs, tomato fruit-worms, two-spotted spider mites, white-flies, and wire-worms. Vertebrates range from chipmunks to deer, mice, rabbits, raccoons, rats, squirrels, voles, and woodchucks.

Elodea is a group of aquatic plants also called the waterweeds. An Elodea leaf would be a leaf from one of these plants.


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