Lettuce diseases pictures

Lettuce diseases pictures

Lettuce grown hydroponically can still suffer from pest problems such as algae and insects. Lettuce Lactuca can be grown hydroponically, allowing you greater control over growing conditions. This cool weather crop grows best in U. Department of Agriculture plant hardiness zones 4 through 9. Hydroponically grown lettuce is still susceptible to pests, such as insects and bacteria.

These pests can infect plants, causing diseases and damage. As there are not many pesticides or fungicides available for greenhouse use, check your lettuce plants every day for signs of disease, infection or insects. The most dangerous pest problem for hydroponically grown lettuce are pathogens carried through water, also called water molds, such as Pythium or Phytophthora.

As these molds are waterborne, one infected plant can easily spread the disease to all plants within the same water circulation system. As there are no available fungicides to treat this disease for hydroponically or greenhouse grown lettuce, you could potentially lose your entire crop. Disinfect all of your equipment and tanks, including in your germination area, to prevent water molds from establishing or spreading. Hydroponically grown lettuce is irrigated from below, reducing the amount of moisture on lettuce leaves.

A study by Ohio State University showed that overhead watering, common for lettuce grown in the ground, led to an increase in bacterial infestations because of the warm, moist and contained environment created by wet lettuce leaves.

Even though hydroponic lettuce is watered from below, spacing plants with sufficient room for air to circulate and moisture to evaporate from the leaves will help prevent growing conditions that would be ideal for bacterial diseases such as powdery mildew and downy mildew.

Hydroponically grown lettuce is susceptible to insect damage, even inside a greenhouse. Because of the different growing conditions, aphids, thrips, mites and whiteflies are of particular concern, as they could thrive in an enclosed environment with much lettuce to feast on. Use insect screening on all of your greenhouse entryways and ventilation points to prevent the insects from entering in the first place.

You can also use sticky traps hanging near the lettuce plants to catch any flying insects that may enter the growing area. Hydroponically grown lettuce is grown in a nutrient solution. The mixture of a humid environment and water rich in nutrients means the solution tanks are perfect places for algae to thrive. As algae needs plenty of sunlight to develop, shading your solution tanks can prevent algae from taking hold or overrunning your hydroponic system.

He leads gardening workshops for elementary school children. Skip to main content. Home Guides Garden Pest Control. Home Guides Garden Pest Control Lettuce grown hydroponically can still suffer from pest problems such as algae and insects.

Water Molds The most dangerous pest problem for hydroponically grown lettuce are pathogens carried through water, also called water molds, such as Pythium or Phytophthora. Bacteria Hydroponically grown lettuce is irrigated from below, reducing the amount of moisture on lettuce leaves. Insects Hydroponically grown lettuce is susceptible to insect damage, even inside a greenhouse. Algae Hydroponically grown lettuce is grown in a nutrient solution. Customer Service Newsroom Contacts.Any variety of lettuce is fairly easy to grow ; however, most varieties are susceptible to insect pests that attack the lettuce and either kill it off completely or do irreparable damage.

Keep reading to learn more about these pests and when lettuce insecticide may be necessary for control. There are a number of pests that attack lettuce plants.

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Some of the most common lettuce pests are:. Depending on your climate and region, you may find any or all of these pests on lettuce plants. As you can see, not only are you lusting after tender greens, but every insect in town has designs on your romaine. Here are a few things to look for and tips on controlling some of the above insect pests of lettuce:.

Aphids — Aphids pose a quadruple threat.

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First they suck the water and nutrients from the plant tissue, resulting in the curling of leaves and the demise of young plants. Third, aphids act as virus vectors often assisting in the introduction of diseases like lettuce mosaic. Finally, aphids deposit significant amounts of honeydew on the leaveswhich foster the growth of sooty mold. One method for controlling aphids is to introduce or encourage natural predators such as lady beetleslacewingsdamsel bugs, flower fly maggots, parasitic waspsand birds.

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Horticultural soap or neem oil may also be used to control the aphid population. There are no systemic insecticides to control aphids. Caterpillars — The most damaging group of insect pests that attack lettuce are those in the family Lepidoptera caterpillarswhich include many varieties of cutwormarmyworm, corn earworm and cabbage looper. Each type has a different feeding habit with different life cycles foraging on different areas of lettuce, but the result is the same: holey, mangled foliage — even eaten in its entirety.

Some Lepidoptera have natural predators which can be encouraged; otherwise, finding an effective insecticide may be the answer. Thrips — Thrips may affect the entire lettuce plant in all its stages of growth and end up causing leaf malformation.

lettuce diseases pictures

They are also vectors for some lettuce diseases. Leaf miners — Leaf miners insert eggs in the upper leaf surface, which in turn become maggots. Use of the insecticide spinosad in commercial farming has seen a reduction in infestation, although with all things, some evidence now points to their resistance to it. Beetles — Beetle varieties are soil infecting insects for the most part; their larvae hatch in the soil and often feed on the roots of the lettuce plants.

Slugs and snails — Slugs and snails adore the tender, young green lettuce and can voraciously erase any hint of seedlings almost as soon as they are planted. They hide during the daytime hours among weeds, plant debris, stones, boards, ground cover and anything close to the ground.

Also, utilize drip irrigation to reduce the humidity and moist areas where these critters congregate.

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Some types of plants such as nasturtiumsbegoniasfuchsiasgeraniumslavenderrosemary and sage are avoided by slugs and snails, so including these plants among or near lettuce rows should help. Traps, organic bait and barrier placement are all useful tools in the removal of snails and slugs. Water the area slightly to encourage the slugs and snails to come out and bait in the afternoon or early evening. If you are not squeamish, a successful method of removal is to hand pluck the insects from habitable areas two hours after dark with the aid of a flashlight.

Azadirachtin, which is a natural compound derived from the neem tree, is effective against caterpillars and aphids. Bacillus thuringiensis is a natural soil bacterium, which can aid in the eradication of caterpillars. Spinosad is used to control the Lepidopteran larvae and leaf miners.Januaris is a part-time gardener and author of farming guides. He loves to write about crops, pest control, fish farming, and beekeeping.

Garden pests can cause huge damage to leafy vegetables. If they are not well controlled or managed, they can greatly reduce the leaf quality or even kill the whole crop. Just in case you didn't know, leafy vegetables refer to crops in the Cruciferae or Brassicaceae family.

Examples of them include collard green, kale, cabbage, spinach, broccoli, rape, cauliflower, lettuce, celery, and turnip. There are several pests that attack leafy vegetables, and all can be categorized into flies, bugs, mites, worms, and mollusks.

If you grow greens or planning to grow them, here are the most common pests of leaf vegetables, their prevention, control, and management. See clear photos of these harmful organisms to help identify the exact pest affecting your crop! Leaf miners are destructive pests that suck sap and feed on the leaves, causing white tunnels or trails on the crop. The adult insect is a grey or white fly while the larva or maggot is a greenish yellow caterpillar with a pair of black mouth hooks.

It is well known to cause great damage to beet, spinach, and chard. These harmful insects can be controlled by a suitable insecticide. They can also be controlled by biological sprays, wasp predators which eat the larva and mechanical methods such as destroying infested crops and eliminating weeds. There are several species of aphids that attack greens, but the most common ones are peach aphids and potato aphids. These insects are usually small, pear-shaped with long sucking mouth parts and green, pink, orange, or dark red in color.

They can also transmit diseases such as mosaic and sooty mold. Popularly known as plant lice, aphids can be controlled by a broad-spectrum pesticide which can be sprayed on the stems and on both sides of the leaves. However, aphids and other garden pests have become resistant to many broad-spectrum insecticides, pesticides and other killer chemicals which means that most chemicals out there do not help with these harmful organisms.

When looking for the most effective pesticide for your vegetables, you should go for this insecticidal soap insect killer which is well known to control all kinds of garden pests, including their larvae and eggs.

This ready-to-use insecticide is made of specially selected soaps and other natural and botanically derived ingredients which make it safe to people, animals, and birds.Januaris is a part-time gardener and author of farming guides. He loves to write about crops, pest control, fish farming, and beekeeping. Diseases of leafy vegetables can cause devastating effects to your crop. They can completely kill your crop or significantly reduce its quality, which means that you can incur great losses if one of the diseases strikes your garden.

Just in case you didn't know, leafy vegetables refer to crops such as collard greens, kale, cabbage, spinach, broccoli, rape, cauliflower, lettuce, celery, and turnip among others. They belong to the family Cruciferae. There are several diseases that attack leafy vegetables, and they are majorly caused by fungi, bacteria, or viruses.

If you grow greens or planning to grow them, here are the common diseases of leaf vegetables, their causes, prevention, control, and treatment.

13 Common Pests of Leafy Vegetables: Photos, Prevention, and Control

See clear vegetable disease photos in order to exactly diagnose the problem with your crop! Downy mildew is a fungal disease caused by Peronospora parasitica. It causes white mold and faint yellow spots on the dorsal and ventral sides of the leaves respectively. The fungus thrives in cold and wet conditions, so you can prevent it by avoiding these conditions in your garden.

Some practices that can cause cold and wet conditions are excess watering and over-head irrigation. You can control downy mildew by uprooting the infected crop and burning it, and you can treat it by using the fosetyl-al fungicide. Alternaria leaf spot is caused by fungus Alternaria brassicae. The leaves of the infected crop especially kales have black or brown circular spots. With time, the spots enlarge and concentric rings appear on them. You can prevent this disease by planting certified seed or disease-free transplants.

You can also prevent it by avoiding wet and warm conditions in your garden as the fungus is very active under these conditions. Cruciferae weeds harbor the fungus, so you should eradicate them from your garden. The best way to control Alternaria leaf spot is to uproot and bury or burn the infected crop. You can also spray your crops with a suitable fungicide immediately after you see the symptoms. Brought about by fungus Cercospora brassicicola, Frogeye leaf spot causes pale green, gray, or white spots on the leaves.

The spots are bordered by a brown ring and can take any shape. You can prevent this disease by planting fungus-free seed or transplants. Another great way to prevent the fungus is to improve soil drainage and avoid excess moisture in the garden. In addition, you can prevent it by doing proper weeding and crop residue removal.

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You can control frogeye leaf spot by practicing crop rotation. Some copper products and fungicides like Benomyl can treat and control the disease. Use these chemicals immediately after you see the symptoms. White spot is a leafy vegetable disease caused by fungus Pseudocercosporella capsellae. The crop infected by the fungi usually has brown or gray spots on the leaves.Tipburn is a breakdown of the leaf margins which is of particular concern on the internal heart leaves which are not obvious at harvest Figure 1.

External tipburn can also occur on the outer wrapper leaves but these can be trimmed at harvest. Tipburn is a critical defect which limits the appearance and shelf life of lettuce fresh market lettuce and minimally processed salad mixes. Internal tipburn is a real problem for summer lettuce growers because its incidence is variable, some plantings are affected more than others and it may not be apparent at harvest. Tipburn can lead to internal bacterial breakdown or slime within the head and the crop can become unmarketable.

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Internal tipburn is critical if the lettuce is to be used for salad mixes as there is zero tolerance for defects which dramatically reduce shelf life. Calcium strengthens plant cell walls and tipburn is more accurately related to the inability of plants to supply enough calcium to developing leaves during periods of rapid growth. Calcium moves from the roots to the leaves of the plant along with water drawn by the transpiration process.

Rapidly transpiring outer leaves draw most of the water and accumulate most of the calcium. Enclosed lettuce heart leaves, which are growing rapidly, have a much lower transpiration rate and draw less water and consequently less calcium.

With less calcium available, the rapidly growing heart leaves form weaker cell walls which may collapse and die as the leaves expand close to harvest. This is seen as internal tipburn. These breakdown sites allow entry of bacteria which results in further breakdown and unmarketable product.

While tipburn is generally considered a calcium deficiency problem, symptoms can occur despite plentiful supplies of calcium in most vegetable growing soils. The problem is moving sufficient calcium to the rapidly growing inner leaves. External tipburn can occur for similar reasons but can also be caused by windburn, sand blasting or other physical damage to the delicate growing leaf tips. Tipburn is a feature of rapidly growing summer lettuce but it can also occur in spring and autumn and reflects the inability of plants to move sufficient water and nutrients to the rapidly growing leaf tissues enclosed in the heart of the lettuce plant.

The answer is that tipburn is induced by a number of factors including growth rate, which are a function of climate, water and nutrient availability, supply of calcium and any stress imposed on the plant which results in uneven growth rate.

The sap calcium trend for both summer and winter crops is similar, as indicated in the graphs below Figures 2 and 3. Field work has shown that close to harvest, concentrations of calcium in the sap of "winter" lettuce fell to levels comparable with summer lettuce. Tipburn does not usually develop in winter plantings because of the slower and more consistent winter growing conditions.Aside from common plant pests, there are several different types of common plant diseases that can threaten your new garden.

Among these plagues are mildew, molds, viruses, and algae. Most of them are caused, as you might suspect, by high humidity and stale air. Excessive humidity is the leading cause of fungus and mold outbreaks, so it pays to keep an eye on the humidity level of your garden environment. You might think that a hot, humid atmosphere like an orchid house might also be the best for your veggies, but that is not the case. You can reduce the humidity in your grow area by using an air conditioner, and also an inexpensive fan to keep the air circulating.

It is best to see the leaves of your plants moving very slightly, 24 hours per day.

lettuce diseases pictures

This flushes out stale air and helps to prevent the formation of those dreaded mildews and molds, as well as other common plant diseases. Also be careful not to over-water your plants, and make sure the media used is draining well between feedings. Soggy plant media makes a great host for disease and algae growth. Below we list the most common plant diseases you might find in your hydroponic garden:.

A sooty, grayish-white growth on the leaves kinda like hair or lint. This is the most common fungus caused by excessive humidity, and is usually fatal once it takes hold.

If you catch it as a fresh outbreak, you may be able to fight it off.

Plant Disease Identification Guides

First appears as small white spots on the tops of the leaves, but then progresses a fine, pale gray-white powder, all over. Growth slows, leaves turn yellow and the plant dies. Powdery mildew is caused by cool temps, dim light and high humidity.

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How to treat this common plant disease? This common plant disease usually affects your newly planted seedlings, and is caused by too-moist planting media. You must keep those grow-cubes drained off, not just sitting in water. Damping off first appears as a wet-looking dark stem. The seedling then collapses at the "soil line", and falls over dead.

There is no cure, once damping-off strikes. So how do you prevent it? You know what this looks like; a greenish tinge that covers the top of the plant media, and may infest your nutrient vat, too. Algae is really not a serious problem, however it is unsightly and signals to you that conditions may be a little too moist in there.

Plant Disease Identification Guides

Algae growth is caused by stagnant water, excessive moisture, and light. You can prevent it from attacking your nutrient solution by using only opaque tubing in your system not clear. Cover any ports in the nutrient reservoir with hatches or duck tape to keep light out.

Other measures that may help:. The lower leaves start to curl up, dry out and wilt. Sometimes, portions of the plant may wilt suddenly. You can prevent these wilt viruses by using only fresh, clean medium for each planting, and using resistant varieties of tomatoes labelled V or F.

If you do contract one of these common plant diseases, you cannot re-use the media, or the wilts will just reappear in your new planting. You might want to try treating the wilts with DCM Bio-Fungus, but honestly, it is best to just get that diseased plant OUT of your hydro setup, and disinfect well before starting your next new garden. This virus remains on tobacco leaves for years.

Save Your Tomato Plants From These Common Diseases

It can be introduced to your garden by the hands of smokers. It can afflict peppers, cucumbers, and tomato plants, and it is very hard to eradicate if you are unlucky enough to contract this plague. Prevention is the keyword here:. You may need to resort to stronger measures to control these common plant diseases.Various types of lettuce are cultivated across the globe, primarily for human consumption of their fresh, succulent leaves. Over 75 lettuce disorders of diverse causes and etiologies have been described.

While some diseases are limited in their importance and distribution, a significant number are present wherever Lactuca sativa L. Many are capable of causing devastating losses in yield and quality under favorable conditions.

In this chapter, we have divided lettuce diseases broadly into infectious and non-infectious disorders. Of the important infectious diseases covered, fungi and viruses account for the bulk. Nine fungal diseases are discussed, including anthracnose, bottom rot, Cercospora leaf spot, damping-off, downy mildew, drop, gray mold, Septoria leaf spot, and southern blight. Five viral diseases are covered, and these are: beet western yellows, lettuce big-vein, lettuce infectious yellows, lettuce mosaic, and tomato spotted wilt.

The sole phytoplasmic lettuce disease, aster yellows, is also discussed. Of five important bacterial diseases detailed, four are foliar disorders: bacterial leaf spot, marginal leaf blight, soft rot, and varnish spot. Corky root is the one bacterial root disease included. In contrast, all nematode pathogens discussed, lesion, needle, and root-knot nematodes, infect lettuce roots.

Three important non-infectious disorders are included in this chapter, namely brown stain, pink rib, and tipburn. These are mainly disorders of mature or postharvest lettuce. Unable to display preview. Download preview PDF. Skip to main content. Advertisement Hide. Lettuce Diseases and their Management. This process is experimental and the keywords may be updated as the learning algorithm improves.

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lettuce diseases pictures

Abawi, G. Epidemiology of disease caused by Sclerotinia species.


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