Northerner Posted May 11, 2019 I acquired a few specimens recently and a few of them had some scarring, then the scarring started turning yellow and spotting all over them. There's a pic there of one where the scarring looks like when I got them, and the first yellow spot popping up. What is it? How do I help them? 1 Share this post Link to post Share on other sites
andros88 Posted May 11, 2019 My peruvianus had the same issue (yellow spotting) when I first received it. The spots kept multiplying until I cut them off. The new growth is healthy and doesn't have this issue. Still don't know what the yellow spots were tho - maybe some type of scale? Share this post Link to post Share on other sites
Evil Genius Posted May 11, 2019 The original plant suffers from scale, which then again causes substantial scarring. Look into pesticides against Scale, e.g. Azamax or something similar. 1 Share this post Link to post Share on other sites
Evil Genius Posted May 11, 2019 Second plant has scale too. Same treatment, Neem, Azamax, Spinosad etc. 1 Share this post Link to post Share on other sites
oncewhywechange Posted May 12, 2019 On 11/05/2019 at 5:23 PM, Evil Genius said: The original plant suffers from scale, which then again causes substantial scarring. Look into pesticides against Scale, e.g. Azamax or something similar. Could of been scale but the problem is a fungal issue, You need to treat with a good fungicide. Share this post Link to post Share on other sites
Northerner Posted June 4, 2019 In the spirit of growing cactus I decided to do just keep them dry. As the weather cooled and the air dried whatever it was has died off. Share this post Link to post Share on other sites
Glaukus Posted June 5, 2019 On 12/05/2019 at 7:46 PM, motherfirefly said: Could of been scale but the problem is a fungal issue, You need to treat with a good fungicide. I agree. There is a fungal issue and just keeping it dry won't fix it. Get some phosacid on it. Share this post Link to post Share on other sites
Glaukus Posted June 5, 2019 On 11/05/2019 at 12:21 PM, andros88 said: My peruvianus had the same issue (yellow spotting) when I first received it. The spots kept multiplying until I cut them off. The new growth is healthy and doesn't have this issue. Still don't know what the yellow spots were tho - maybe some type of scale? Not scale imo. I'd do the same, get some phosacid. You can get it from most garden centres or the big green shed as "Yates anti-rot". Phosacid is a systemic fungicide but not a toxic one, it's quite safe. 1 Share this post Link to post Share on other sites
andros88 Posted June 5, 2019 Thanks Glaukus! It's going on my list for my next trip to Bunnings Share this post Link to post Share on other sites
