Does this Photinia have black spot?
Lindsay K
7 years ago
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gardengal48 (PNW Z8/9)
7 years agolast modified: 7 years agoLindsay K
7 years agolast modified: 7 years agoRelated Discussions
Cleanup important if roses have black spot
Comments (23)I think I found a possible explanation for what I've observed often enough to keep bringing up that I don't strip on the first sign of leaf infection. If this does explain it (or if it's a good theory anyway), then it does seem to have to do with my choice of roses or the aggressiveness (lesion expansion rates) of the local strains of BS here. From http://www.rosehybridizers.org/Fall_2012_Zlesak_long_version.pdf "...We have blackspot resistance field data for the roses that are designated Earth-Kindî in the South Central US. As we correlate the mean lesion size in the lab with the percentage of defoliation due to blackspot in the field, r=0.62...So in this case there is a pretty strong trend that as lesion size goes up for a rose in the lab, the more defoliation we see for that rose in the field. Since different isolates of different races can be more aggressive and lead to different lesion expansion rates, it is very promising to see such a strong correlation in the midst of that variability. As more blackspot resistance data are collected from other ongoing Earth-Kindî trials involving some of these 70+ roses, it will be interesting to revisit the correlation between the laboratory and field data...." And the RHS has seen what I'm talking about, so at least I don't feel so crazy ;) http://apps.rhs.org.uk/advicesearch/Profile.aspx?PID=270 "Typically, a rapidly enlarging purplish or black patch appears on the upper leaf surface, with diffuse and radiating strands of the fungus sometimes just visible. Leaf tissues may turn yellow around the spots and the leaf often drops, even though other parts are as yet unaffected. At other times, the yellow colour does not appear, but infected leaves still drop. Sometimes, the spots remain relatively small and the leaf does not drop. [!]" I'm not trying to tell anyone how to do anything if it goes counter to their local experience, of course. I guess I'm saying that folks might wait a bit and see what happens if they don't strip leaves if the plant will be very defoliated if they did strip so many leaves that don't look too bad. See what happens, perhaps. Or not :) Here is a link that might be useful: Strategies and resources for breeding blackspot resistant roses, DAVID C. ZLESAK...See MoreBasil leaves have black tiny spots that look like insect feces
Comments (28)I've the exact problem. Can Confirm, as secretmail021 has identified, it is a very very very small insect. White-green color, approximately as wide as 1-2 human hairs, about 1.5 mm in length... you won't see them on the leaf, Instead, pick a leaf and shake/tap it over a well-lit preferably dark surface.... if they fall off, you can see them crawl. Happened with indoor potted plant that was otherwise healthy for the last month. No idea for the solution, but act fast, because it spread from a few just a few leaves to a few plants over the course of half a week. RIP basil....See MoreBlack Spots on leaves, maybe black ants to blame?
Comments (8)Thanks for the reply Mike! I thought that was a possibility too. We had a miserably hot summer down here in TX this year and it lost a few leaves in a similar manner then as well (not sure if that tells you anything). It has been a bit cooler the past couple of weeks. Got down into the lower 60s upper 50s at night. It would be that cool for a couple of nights and then warm up into the 70s. The plant is probably used to highs in the upper 80s and 90s with lows in the 70s to lower 80s. I say that because I am not sure if the plant will start to drop its leaves for the fall based on the temps that are normal for the climate it is in. However I did move the plant inside and it never gets cooler than 70 there. I read some forum posts on winterizing the plants and that made me think that the cooler temps are to blame. Haven't seen the the ants past couple of days. Maybe the bait worked, not sure though. How do I post a picture of the plant? I don't see anywhere to upload a picture to this post....See MoreYellow leaves, black edges, black spots: why?
Comments (2)I sure wish someone would answer this because I have the exact same problem. Had it last year and it affected all my plants and I'm seeing it again this year already....See Moregardengal48 (PNW Z8/9)
7 years agolast modified: 7 years agoLindsay K
7 years agolast modified: 7 years agoEmbothrium
7 years agoLindsay K
7 years agolast modified: 7 years agoDave in NoVA • N. Virginia • zone 7A
7 years agolast modified: 7 years agoDave in NoVA • N. Virginia • zone 7A
7 years agolast modified: 7 years agogardengal48 (PNW Z8/9)
7 years agoMike McGarvey
7 years agoLindsay K
7 years agolast modified: 7 years agoEmbothrium
7 years agolast modified: 7 years agoLindsay K
7 years agolast modified: 7 years agoLogan L Johnson
7 years agoLindsay K
7 years agoLindsay K
7 years agolast modified: 7 years agoEmbothrium
7 years agoLogan L Johnson
7 years agoLindsay K
7 years agolast modified: 7 years agoLindsay K
7 years agolast modified: 7 years agoLogan L Johnson
7 years agoEmbothrium
7 years agolast modified: 7 years agoLindsay K
7 years agoLogan L Johnson
7 years ago
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ken_adrian Adrian MI cold Z5