Posted 7M ago by @ProMarjoram

What’s going on with my plan?
6” pot
Last watered 7 months ago
Hi I noticed your plant doesnt have drainage, it might be a case of overwatering. Maybe consider changing the pot to one with drainage? :)
@ProMarjoram Philodendron develops brown spots due to fungal infection. Too much light and overwatering are also common causes for brown spots on philodendron. In addition, Insect infestation, excess fertilizer application, low humidity, or root rot can cause this common problem. How to Treat Common Pests
◦ Mealybugs can be treated by pruning, and dabbing a rubbing alcohol soaked cotton swab on the infested areas.
◦ Spider mites are first treated by pruning infested areas before spraying the leaves with neem oil diluted in water.
◦ Scale, if treating small infestations, responds well to pruning and rubbing alcohol. For larger infestations, you’ll likely need to discard your plant.
◦ Thrips can be treated by pruning and a diluted neem oil treatment.

What To Do if your Plant Has Erwinia Blight Disease
Erwinia Blight Disease is much easier to prevent than it is to cure. It’s a bacterial infection that causes wet, transparent mushy looking patches on the plant.
It starts just below soil level and creeps up to the stems and if left unchecked will cause wet lesions on the leaves.
Erwinia is serious disease that can kill your philodendron in days. It’s caused by too much overwatering from overhead (this is one reason I recommend you don’t mist the leaves).
Prune the infected leaves, change the potting mix, minimize watering applications, and allow spacing in between plants for rapid drying of leaves. Unfortunately, bactericides have been shown to be ineffective against erwinia blight.
If the disease has spread to lots of leaves or many parts of the stem, it’s likely it’s incurable.

Foliage Pesticide Spray
1. Mix equal parts 3% hydrogen peroxide and distilled water.
2. Use a spray bottle to thoroughly soak the infected plants. Make sure to get the undersides of the leaves.
3. Spray once a week or after it rains. Hydrogen peroxide both treats and further prevents pest infestation.
This weaker solution will prevent damage to the leaves but is effective as a general insecticide. I've found that it is effective against a variety of mites and aphids.
Because it also has fungicidal properties, one may find it as a possible solution to mildew and fungus outbreaks.

Treating Black Leaf Spot Fungus

Baking Soda and Water
If you don’t want to use chemical fungicides, try spraying your plants with a bicarbonate solution:
• Mix 1 teaspoon baking soda in 1 quart of water. Spray plants thoroughly, as the solution will only kill fungus that it comes into contact with. You can also add a teaspoon or less of neem oil to help it stick to the leaf better.

The plant might have leaf spot disease
If your plant’s leaves have small brown spots trimmed in yellow, this could be a sign that it has leaf spot disease, which is a fungus or bacteria that feeds on the leaves. If this is the case, don’t start planning a plant funeral just yet. This problem is treatable. It is best to immediately remove the affected leaves and isolate the plant from your other greenery for a bit. 
“To treat leaf spot disease, put a tablespoon or two of baking soda and a teaspoon or two of mineral oil in a spray bottle of water. Shake the solution well and then spray all areas of the plant that are infected with brown spots. It may take a couple of applications before the bacteria is totally gone.

Water Treatment
For a general water treatment and dechlorinator, mix one tablespoon hydrogen peroxide for every gallon of water used.
The hydrogen peroxide acts instantly to drive out chlorine, excess iron and sulfates.
A Word of Warning
You'll be pleasantly surprised with the effectiveness of hydrogen peroxide for plants! My one word of caution is to avoid using it in the soil too often. Since it will easily rid your soil of harmful pests, it can also take its toll on beneficial soil organisms. So, use it wisely and only treat when an infection or rot has been confirmed.
@ProMarjoram I would repot with a pot that has drainage and treat with Neem oil as well.
@ProMarjoram I could be wrong (pretty sure I’m correct) but I think that’s from the extra floral nectarines. The plant produces sugars for ants to use the ants to protect the plant from pests. These are not a fungal issue. Maybe have a close look over the plant but this is perfectly normal for a philodendron.
@x.jess it’s in a pot with drainage. That’s a second pot for decor.
@KikisOasis it has drainage, it’s sitting in a decorative pot.
No pest and it’s contained to this one plant. What’s scary is you can see it on the leaf that hasn’t unfurled.
@ProMarjoram I have the same on mt philodendron and it was actually on the petiole sheath and not on the actual leaf. Leaf has just come out today. But you can see it on the old leaf.
@ProMarjoram philodendron j can just do it and over produce. If no pests nothing to worry about.

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