Several of my plants have these spots. I assumed they were some sort of bacterial or fungal infection. I would cut off the leaves to avoid the disease spreading and it would break my heart because the leaves were beautiful, not to mention took a long time to grow. I later had seen a post and it made me think that they were actually not a disease but rather something that happens during transpiration if the plant is stressed or something. I thought that was great because now I don’t have to cut off the leaves however it seems like it’s spreading and they’re getting more and more and I don’t know what to do. Can anyone definitively say what these are and if I need to cut off the leaves. it’s driving me crazy! btw the first photos are the most recent a.k.a. the worst. -also it’s primarily philodendrons. my watering habits tend to be sporadic especially during the summer when they are outdoors and I obviously cannot control the rain. The pink princess are definitely on the dry side most of the time the plan get very high light.
by D-Swish
7 Comments
I’d also like to know!
[deleted]
no. I did use neem oil last year when I first started seeing it on the pink princess and also on a Birkin. This year I haven’t used any neem at all. This is my first year with the white night. I bring them outdoors for the summer under a shade cloth -about 60% now that I think about it it first started happening with my Birkin and I started just cutting off the leaves and it was driving me crazy so I added the systematic fungicide and I don’t think it worked but I have to say that my birkin does not have any spots this year.
https://preview.redd.it/549lsgfiu8lf1.jpeg?width=3024&format=pjpg&auto=webp&s=77349aef787fdcbef01a07077a076194f7f091c3
It has a couple spots on one of the old leaves that I left on
https://preview.redd.it/429vyu8su8lf1.jpeg?width=3024&format=pjpg&auto=webp&s=fcbb20c59bfa00353eea383549ef22a8a9742d38
This was a leaf that I cut off from last year… it’s only letting me post one photo at a time now so….
If there’s a sticky sap secreted from it, then it’s extrafloral nectaries. If no sap, I’d assume rust fungus. EFN’s are very common in philos. Keeping it outside will increase EFN’s because it is a defense mechanism of the plant to attract lady bugs and other beneficial bugs to keep harmful pests away. The spots come from the sap drying on the leaves causing cosmetic damage. If you really don’t like them, I’d keep them inside and you should see less on new leaves. The old ones will not go away though.
I see that the foliage is wet. Bacterial and fungal pathogens only need water to proliferate. It’s important to keep leaves dry, especially if indoors or not getting sufficient air flow. Wet foliage is how you get things like bacterial leaf spot. 💚
edit: Sunburn would never result in tiny spots unless the light hitting it was that size. Sunburn covers a large swath of the leaf.
Page 5 and 6 looks like young scale