Initial symptoms are white spots or pustules on the underside of the leaves. Lettuce is a cool-weather crop. As with downy mildew, remove any infected plants. Extension > Garden > Diagnose a problem > What's wrong with my plant? Leaf miners are destructive pests that suck sap and feed on the leaves, causing white tunnels or trails on the crop. Pale yellow to very light green spots appear on the mature leaves of the lettuce. Downy mildew thrives in infected crop residue. Bacterial leaf spot of lettuce caused by Xanthomonas campestris pv. The botanical name for the substance is lactucarium, which comes from lactus, the Latin word for milk (the botanical name for lettuce is lactuca sativa, which also stems from this word).The white sap is a little bitter and, interestingly, has a sleep-inducing compound. Powdery mildew is a common fungal disease encountered in greenhouse production of lettuce. This fact sheet details the causal pathogen, favorable environmental factors and recommendations for control for greenhouse producers. So suddenly you’re vibrantly green, healthy lettuce has white spots. It is well known to cause great damage to beet, spinach, and chard. Downy mildew is my number one culprit simply because it seems to attack all types of vegetation. Powdery mildew is different than other fungi, in that it does not need water on the leaves to infect the leaves or grow on them, so spraying water will not increase powdery mildew, but it could increase the chances of getting other collard diseases, such as downy mildew or Alternaria leaf spot. Fungal lettuce diseases, such as damping off or sclerotinia drop (white mold), are caused by soil borne fungi that thrive in cool, damp soil and are primarily lettuce seedling diseases. White mold, also known as sclerotinia, is a fungal disease that affects over 360 different plants, including beans, peas, lettuce, and members of the cabbage family.White mold is sometimes called timber rot when it affects tomatoes. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. With its refreshingly light taste, lettuce (Lactuca) can become bitter-tasting if it is exposed to certain growing conditions. Some diseases are more benign than others, but even so, fungi spread through spores that are pretty hard to tackle. It thrives in temperatures from 55-70 degrees. Hi Random, Thanks for posting. In the future, plant resistant varieties and use drip irrigation or focus on watering at the base of the plant to keep the leaves of the plants dry since fungal infections generally coincide with moisture that lingers on the leaves of plants. Treating these lettuce diseases is achieved by spacing the plants apart to provide airflow and by reducing the amount of irrigation the seedlings receive. Another possibility is called white rust or Albugo candida.Another fungal disease, white rust may commonly affect not only lettuce but mizuna, Chinese cabbage, radish and mustard leaves.Initial symptoms are white spots or pustules on the underside of the leaves. If that is the case, it is likely something in the air that has drifted down onto the leaves. white mold on door. How to treat this common plant disease? Decrease humidity; Increase air circulation and ventilation The Causes of Bitter Lettuce Sap. As the disease advances, the leaves turn white and moldy and the plant dies. Bacterial canker also creates whitish spots on leaves, but they will be slightly raised off the surface of the leaf. If the white spots on the lettuce cannot be removed, the cause is likely a fungal disease. If you suspect downy mildew, the best bet is to remove and destroy the plant. This post is filed under Defect Identification.. You can follow any responses to this entry through the RSS 2.0 feed.. You can leave a response, or trackback from your own site.. 2 Comments on “Romaine- Rib Discoloration” Jeff Provost Says: June 20th, 2012 at 10:25 am I was inspecting Romaine just yesterday, and came across yellow spots on the leaves (discoloration). Another possibility is called white rust or Albugo candida. The Causes of Bitter Lettuce Sap. 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. White Rust Scientific Name: Albugo Candida Disease Type: Fungus Plants Affected: Lettuce, Mizuna, Chinese Cabbage, Radish, and Mustard Leaves Symptom: White spots or "pustules" on underside of leaves; Wilting and browning of leaves First appears as small white spots on the tops of the leaves, but then progresses a fine, pale gray-white powder, all over. The fungus that creates angular leaf spot forms white spots … Actually, do better than look – see if you can wipe the spots off. As the disease progresses, the leaves brown and wilt. Septoria leaf spot is a fungal disease that may cause white or grayish spots on leaves. Symptoms appear in about 5-10 days from infection often following cool, humid weather with rain or heavy fog or dew. Once colonies form, however, white molds appear as spots on a surface. 1 of 5. Sign up for our newsletter. Many growers struggle with controlling the disease on lettuce crops grown in protected environments, especially during the fall and winter months. The disease was first reported in California in 1964. Growth slows, leaves turn yellow and the plant dies. The fungus that creates angular leaf spot forms white spots … Also, keep the garden free from plant debris that harbors the fungi. Because the tender leaf of lettuce is eaten, I don’t recommend spraying lettuce with white spots that are suspected as coming from a fungus. Septoria leaf spot is a fungal disease that may cause white or grayish spots on leaves. White Rust Scientific Name: Albugo Candida Disease Type: Fungus Plants Affected: Lettuce, Mizuna, Chinese Cabbage, Radish, and Mustard Leaves Symptom: White spots or "pustules" on underside of leaves; Wilting and browning of leaves Spinach White Rust Disease – Treating Spinach Plants With White Rust, Radish Plant Has Yellow Leaves: Why Do Radish Leaves Turn Yellow, Prickly Kale Leaves – Does Kale Have Thorns, Corn Husk Wreath Ideas: How To Make A Corn Husk Wreath, DIY Air Plant Wreaths: Wreath Making With Air Plants, What Is Osmin Basil – Learn About Basil ‘Osmin’ Purple Plant Care, Wallis’s Wonder Plum Info – How To Grow A Wallis’s Wonder Plum Tree, Messina Peach Care: Growing Messina Peaches, Cinnamon Basil Info – How To Care For Cinnamon Basil Plants, Thanksgiving Tradition: Turning Homegrown Pumpkins Into Pie, Growing Thanksgiving Dinner – Must Have Turkey Side Dishes, Interesting Uses For Pecans: What To Do With Pecans, The Bountiful Garden: Bringing The Garden To Thanksgiving. With its refreshingly light taste, lettuce (Lactuca) can become bitter-tasting if it is exposed to certain growing conditions. Keep reading to find out the causes of white spots on lettuce plants. Bacterial canker also creates whitish spots on leaves, but they will be slightly raised off the surface of the leaf. Leaf tissue around the spots turns yellow; Fuzzy white growth can be seen on the underside of the leaves; > Vegetable > Lettuce and Endive > Spots or blotches on leaves. Plants Affected: Lettuce, Mizuna, Chinese Cabbage, Radish, and Mustard Leaves, "Mizuna: White rust" by Scot Nelson is licensed under CC BY 2.0, "White rust of Chinese cabbage caused by Albugo candida" by Scot Nelson is licensed under CC BY 2.0, If you require information in an alternative format, please contact us, Copyright 2020 by College of Tropical Agriculture and Human Resources, White Rust of Cruciferous Vegetables in Hawai‘i by Erik Patnude and Scot Nelson, White rust of Chinese cabbage caused by Albugo candida, White spots or "pustules" on underside of leaves, Reduce leaf wetness, such as by using drip irrigation. It has since been reported from the major lettuce growing regions worldwide probably due to contamination of seed. The leaves will be surrounded by a brown or black ring. Lettuce with white spots might mean a few different things, usually a fungal disease but not always. It could be ash if there are forest fires nearby or dust from a nearby quarry. Sign up to get all the latest gardening tips! Sure, AgSil16H is a good source of potassium silicate you can use (which I refer to in my post about silicate in general), however there are many other sources so I didn’t want to go straight to an AgSil16H reference. White molds can either remain white or change to green, black, grey, or practically any other colour over time. vitians was first described in the United States by Nellie Brown in 1918 from diseased lettuce in South Carolina and Virginia. For best production, keep your lettuce in the coolest spot in your home – you’ll have trouble finding a spot so cool it isn’t happy! First of all, take a good look at the white spots. Yes? The leaves will be surrounded by a brown or black ring. Next time around, plant varieties of lettuce that are resistant to this disease such as Arctic King, Big Boston, Salad Bowl and Imperial. You are right to avoid wetting leaves if possible. What Is White Mold? When they first develop, white molds are very hard to detect since the spores are so tiny that they can only be seen under a microscope. Another fungal disease, white rust may commonly affect not only lettuce but mizuna, Chinese cabbage, radish and mustard leaves. Above that, it can tend to bolt because it thinks it is summer and time to go to seed. You thought you did everything to keep the plants healthy so why do your lettuce plants have white spots? Powdery mildew is caused by cool temps, dim light and high humidity. Mold symptoms appear on blossoms, stems, leaves, and pods that have water-soaked spots. Lettuce and Endive > Leaves > Spots or blotches on leaves. The spores are wind borne. Symptoms are white spots or blotches on leaves, but they will be slightly raised off the of... Problem > What 's wrong with my plant the lettuce nearby quarry turn white and moldy the... Fungi spread through spores that are pretty hard to tackle advances, the leaves 1918 from diseased in. 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October 14, 2020
