What is causing these brown spots on calathea?
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ken_adrian Adrian MI cold Z5
last yearMaria Elena (Caribbean - USDA Zone 13a) thanked ken_adrian Adrian MI cold Z5Related Discussions
What is causing brown spots on my Ensete? (PICS)
Comments (2)I have sort of the same problem. One of my younger ensete is in a huge pot, like 2 others, and it is getting these areas of burn or sick patches. I feed them well, they are in high quality potting mix. The get plenty of water, (I have a drip irrigation system) and full sun. I have one here that's 12ft tall-it's her 3rd summer on my deck. The other two are smaller-I bought them on line this spring. I can't find any info on diseases of Ensete Murelli....See MoreWhat is causing these brown spots/speckle on my rubber tree?
Comments (20)Josh - The plants I have under lights for the winter get fertilized each time I water with 1/4 tsp of FP 9-3-6/gallon of water. When I water, about 10-20% of the total amount of water I apply exits the pot. If your plants are getting natural light and you think they could do with more, you might try fertilizing at the strength I mentioned, then water twice so you're flushing the soil, then repeat.At these low doses, there isn't much concern about over-fertilizing unless the soil is VERY dry. I'm watering well before there are any indications of drought stress, and have seen 0 indication of plasmolysis in any of the plants. Keep in mind that plants make their own food - glucose. Fertilizers are the building blocks they use to grow and keep their systems orderly. Charles - There is a difference between air movement and a cold draft or a hot wind. Air movement upsets the boundary layer (of air) surrounding the leaf and increases transpiration. This means that more nutrient solution is moved through the nutrient stream - generally a good thing. Air movement can also have a significant impact on keeping pests and diseases in check, and it helps promote back-budding. On the other hand, if your plant's ability to move water to distal parts is limited by poor root function/health, air movement can be a negative insofar as the plant's appearance goes, because increasing water demands combined + an inability to efficiently move water to the plant's distal parts will produce more necrotic leaf margins or tips. I have 2 - 20" box fans (set to low speed) in my grow area + a 12" round fan blowing over a plastic cake pan cover ($1.50) that holds 2 gallons of water with humidifier wicks in it to increase humidity, which really decreases the humidifier's run time. Too, MG soil has water retention issues you need always consider because of how water retention impacts root health/function. How much/often you water is always a consideration when you're using a water-retentive medium. Al...See MoreHelp, my calathea has sticky spots on the underside of its leaves
Comments (16)Yep, it's definitely dryness response... I had forgotten to water mine, and that's what happened. Causes can be being rootbound, drop in humidity, and change in environmental conditions. Its certainly not scale, mealies or spider mite. As always, look at it with a jewellers loupe, or magnifying glass... As a keen gardener, I always carry a loupe when doing my indoor/outdoor rounds. This particular phenomenon is a sugary excretion - if not noticed quickly, it dries into a sticky crystalline spot, and leaves a transparent spot on the leaf underside. I have cleaned it off with soapy water, and a fresh water wipe afterwards Any little bugs will have been attracted to these sweet secretions, they are not the cause....See MoreWhat's causing these brown spots on my skip laurels?
Comments (6)Since there are no real holes in the leaves to be seen, it's a bit hard to consider that damage being caused by chewing insects :-) It looks more like rust but that is not a common issue with laurels. It almost looks like it has a raised texture to it.....have you tried rubbing it off? Is it dry and papery? Can you provide a good, focused pic of just the leaf damage?...See Moretapla (mid-Michigan, USDA z5b-6a)
last yearMaria Elena (Caribbean - USDA Zone 13a) thanked tapla (mid-Michigan, USDA z5b-6a)Tiffani Tesch
last yeartapla (mid-Michigan, USDA z5b-6a)
last yearlast modified: last yearMichele Rossi
last yearTiffani Tesch
last yeartapla (mid-Michigan, USDA z5b-6a)
last yearMaria Elena (Caribbean - USDA Zone 13a)
last yearlast modified: last year
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tapla (mid-Michigan, USDA z5b-6a)