I picked up this coryphantha andreae last night to check it and I was greeted on the side I couldn't see with this large amount of discolouration, including on one of the small offsets.
This side has been reasonably close to the painted brick wall behind it for the past month or so - does anyone have any suggestions what could be causing this? The plant appears otherwise healthy, although hasn't flowered this year.
Thanks!
Ian
Growing in Nottingham for the past 4 years and recently found my way to a Nottingham branch meeting. A few plants on a windowsill has very quickly turned into a greenhouse full!
Attempting to grow a range of turbinicarpus, coryphantha, escobaria and several other cactus genera. Tylecodons, pelargoniums and conophytums keep me occupied in the winter and an ever expanding number of gasteria live under the bench.
Probably red spider mites. Like mealy bugs they always seem to know which is the opposite side of the plant from the viewer, so that by the time you know they are there they have multiplied and the damage is done!
Malcolm
Stockport, UK
Member of Macclesfield & East Cheshire BCSS Branch
Collection mainly of cacti, though interested in a much wider variety of plants than I can accommodate!
Mal L wrote: ↑Fri Aug 19, 2022 1:03 pm
Probably red spider mites. Like mealy bugs they always seem to know which is the opposite side of the plant from the viewer, so that by the time you know they are there they have multiplied and the damage is done!
I was wondering if it could be that - what's the go-to treatment for them?
Growing in Nottingham for the past 4 years and recently found my way to a Nottingham branch meeting. A few plants on a windowsill has very quickly turned into a greenhouse full!
Attempting to grow a range of turbinicarpus, coryphantha, escobaria and several other cactus genera. Tylecodons, pelargoniums and conophytums keep me occupied in the winter and an ever expanding number of gasteria live under the bench.
I had good results with 3 weeks buried in/under diatomaceous earth and then regular applications of contact pesticides based on "fatty acids". Search for "RHS pesticides for gardeners" pdf.
MatDz wrote: ↑Fri Aug 19, 2022 6:59 pm
I had good results with 3 weeks buried in/under diatomaceous earth and then regular applications of contact pesticides based on "fatty acids". Search for "RHS pesticides for gardeners" pdf.
I’ve got some sb invigorator on the way. Will treat everything as I have another coryphantha that almost definitely has rsm.
habanerocat wrote: ↑Sat Aug 20, 2022 12:16 pm
If you can't see the mites I would go for scorch myself. Perhaps a heat pocket beside the white wall. Have a look here.
I can’t see mites, although I’ve not looked very hard. The more I think about it, the more I think scorch is the issue. The difference between the side facing the wall and the other side is stark. One to chalk up to inexperience I think!
Growing in Nottingham for the past 4 years and recently found my way to a Nottingham branch meeting. A few plants on a windowsill has very quickly turned into a greenhouse full!
Attempting to grow a range of turbinicarpus, coryphantha, escobaria and several other cactus genera. Tylecodons, pelargoniums and conophytums keep me occupied in the winter and an ever expanding number of gasteria live under the bench.
