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    Home » 3 Common Causes of White Spots on Lettuce
    Garden

    3 Common Causes of White Spots on Lettuce

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    3 Common Causes of White Spots on Lettuce
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    A vertical photo of lettuce plants growing in a row in a garden. Green and white text span the center and bottom of the frame.

    It may possibly typically appear to be lettuce and fungal points go hand-in-hand.

    Each these leafy greens and lots of nasty fungal pathogens love nothing greater than moisture and funky temperatures.

    In case you’re seeing white spots in your lettuce, it’s often a secure guess {that a} pathogen has contaminated your vegetation.

    However it’s not simply fungi that may trigger white spots on lettuce leaves.

    A horizontal shot of a head of lettuce on a wooden table.

    We hyperlink to distributors that can assist you discover related merchandise. In case you purchase from considered one of our hyperlinks, we could earn a fee.

    There’s additionally a pest that strongly resembles a fungal illness and has fooled a couple of skilled gardener into considering that their crop had some type of illness, when actually it was an infestation.

    In case you want a refresher about develop lettuce, take a look at our information.

    On this article, we’ll enable you to slender down the reason for white spots in your lettuce and work out deal with the issue so you may get again to having fun with your favourite salad.

    Right here’s the lineup:

    Frequent Causes of White Spots on Lettuce

    1. Downy Mildew
    2. Powdery Mildew
    3. Mealybugs

    In case you’re seeing spots, you could act sooner relatively than later, so let’s dig proper in and take a look at the three widespread points that trigger white recognizing on lettuce crops.

    1. Downy Mildew

    Downy mildew has fairly distinct signs.

    This illness, brought on by the water mildew (oomycete) Bremia lactucae, seems as yellow or mild inexperienced angular spots on the highest floor of the leaves.

    On the undersides, you’ll discover blotches and spots of white fluff.

    A horizontal closeup of many butterhead plants with downy mildew on the leaves.

    Because the illness progresses, the higher lesions flip brown and dry, and if left unchecked, the leaves may die totally.

    It sometimes begins on the older leaves and quickly spreads to new progress. If downy mildew takes maintain on the seedling stage, the plant will doubtless die.

    The pathogen assaults all species within the Lactuca genus – and some different genera, too – and thrives in moist, cool circumstances. It spreads through water, so rain, excessive humidity, and irrigation can ship it far and broad by means of your lettuce patch.

    Past decreasing moisture by watering on the soil stage and spacing vegetation appropriately, you need to use a preventative fungicide if the circumstances in your backyard are conducive to the illness – or you’ve gotten skilled it earlier than.

    In any other case, it’s greatest to plant resistant cultivars and there are heaps to select from. The next are only a sampling of cultivars proof against downy mildew.

    • ‘Adriana’
    • ‘Antonet’
    • ‘Australe’
    • ‘Auvona’
    • ‘Bauer’
    • ‘Mix’
    • ‘Bluerock’
    • ‘Breen’
    • ‘Butterhead’
    • ‘Carlsbad’
    • ‘Cherokee’
    • ‘Conversion’
    • ‘Edox’
    • ‘Elf Ears’
    • ‘Frisygo’ 
    • ‘Inexperienced Star’
    • ‘Gondar’
    • ‘Intred’
    • ‘Milagro’
    • ‘Mottistone’
    • ‘Optima’
    • ‘Powerhouse’
    • ‘Crimson Cross’
    • ‘Crimson Rosie’
    • ‘Starfighter’
    • ‘Teodore’
    • ‘Willow’

    Observe that resistant doesn’t imply immune so when you’ve got a foul outbreak in your backyard, even these could develop into contaminated.

    By the way in which, I like ‘Optima.’ It’s one of many few cultivars that I’ve by no means, not as soon as, had an issue with. It’s a butterhead sort that matures in simply 52 days.

    A square product shot of an Optima lettuce plant in a field.

    ‘Optima’

    Decide up seeds in quite a lot of completely different packet sizes at Excessive Mowing Natural Seeds.

    You may be taught extra about downy mildew and different widespread lettuce ailments in our information.

    2. Powdery Mildew

    It begins out wanting like somebody splattered patches and spots of flour on the leaves, and earlier than it, the powdery progress is coating all the head.

    A horizontal photo of lettuce growing in a raised bed. The leaves are covered with powdery mildew.

    Even worse, because the illness progresses, the leaves may develop into deformed, dry up, and switch brown.

    In case you’re seeing these signs, it’s doubtless that your crop is affected by powdery mildew, a illness brought on by the fungus Golovinomyces cichoracearum.

    Powdery mildew is distressingly widespread, and there are a number of how to deal with it.

    From functions of milk to classy fungicides, there are a selection of various therapy choices which you’ll examine in our information.

    3. Mealybugs

    Wait, what? We’re speaking about white spots on lettuce right here, not bugs.

    Mealybugs are sap-sucking bugs within the household Pseudococcidae, and so they might simply idiot you into considering your crops have been contaminated with a illness.

    A horizontal selective focus of several mealy bugs on the bottom of a leaf.

    Mealybugs are small, considerably flat, and so they transfer very slowly. So whenever you go to take a look at your plant, it appears like white waxy lumps rising on the foliage – however these aren’t lumps, they’re bugs.

    They will also be barely yellow or a grayish colour, and so they usually prefer to cluster in hidden areas underneath the leaves, alongside the stems, or the center of a rosette.

    We often know they’re round as a result of we see the bugs themselves, however they will additionally trigger stunted progress and yellowing as they suck the life out of your leafy greens.

    Learn our information to coping with mealybugs to learn to handle these pests.

    Out, Damned Spot

    Because it’s the leaves of the plant that we eat and never the fruit it produces, it’s all of the extra devastating when the foliage develops white spots.

    Ensure to watch your backyard often to look at for the primary signal of any of those points. In case you see them, act quick and it can save you your crop.

    A horizontal photo of a gardener squatting in a garden bed holding freshly harvested lettuce leaves in both hands.

    Are you seeing spots? Which of those dastardly foes are you going through? Are you having bother figuring issues out? Tell us within the feedback part blow and we’ll attempt to assist.

    And for extra details about rising lettuce in your backyard, now we have just a few different guides that you simply may wish to take a look at subsequent:

    © Ask the Consultants, LLC. ALL RIGHTS RESERVED. See our TOS for extra particulars. Product photograph through Excessive Mowing Natural Seeds. Uncredited pictures: Shutterstock.

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