Where do you live?

Does it wipe off?

In singapore and no the brown thing doesn't wipe off unfortunately. It's part of the leaf it seems.

I have similar problem too and I live in Borneo. I cut off the whole branch but it keep coming back. How to deal with it once and for all?

Just a question, but I recently found a spider living in my rose plant. Will it eat the chilli thrips? And also should I let it live there. Its been there for roughly 3 days now.

I don't know about spider, but I just treat all my roses (15 pots all together) with malathion. I poured the mixture onto the soil, sprayed them around & inside the pots and then sprayed the whole plants with it. My roses are getting better today. Turn out my roses were attacked by legions of thrips! Hoihoisoi I recommend you do the same too. After those brown spots under the leaves, next the young canes will turn black, leaves become curly then buds turn black & die. I didnt know it was thrips. I normally sprayed my roses once a week but turn out spraying is not enough when legions of thrips are living there. Especially when they already lay thousands of eggs. I hope this advice work for you. Regards from Kuching, Sarawak.

Thanks man! Noted! Will do so tomorrow morning XD

Chilli thrips are very different from regular flower thrips. The best insecticide to use is spinosad, if available. It is relatively safe and not too harmful to beneficial insects.

Spiders are beneficial in the garden, but won't control chilli thrips.

I'm concerned about all this spraying. All of it is toxic to the environment and when it's done that frequently it's very worrying. I love roses but I never spray them and if I had to I would not grow them. Toxic chemicals have done incredible damage to the environment and I couldn't live with myself if I added to that in any way just for the enjoyment of a few plants. I don't mean to sound harsh and critical, but we are in an environmental and ecological crisis all over the world, which not everyone realizes.

If one has chilli thrips, or rose midge, the options are to spray or give up roses. If I had either, I'm not sure which I would choose.

Spinosad is a reduced risk pesticide that apparently does little environmental harm. I say "apparently" because, as we know, unexpected hazards have turned up in the past quite often.

Spinosad is a relatively safe and organic spray which is why I recommend
it as opposed to other methods. Chili thrips can cause great damage to
roses (and most likely will) if not dealt with. I do think its important
to not go crazy with the pesticides and kill both damaging and
beneficial insects, but in some places like the tropics, you will have
to deal with insects more than others. If you want to grow roses, you
will have to fight the pest fight. The discussion isn't on whether or
not one should spray. It is on identifying the problem and offering a
solution.

That being said, I don't think its a bad idea to remind people about the dangers of pesticides, but like Michael says, in some places its either some use of pesticides or no roses at all.

Spinosad huh? I'm not entirely sure where can I get it here :/ I know Maletion is in the market but not entirely sure about spinosad D:

Okay. I've surveyed my choices at my local nursery and so far the products they have are Malathion, Abemectin, Cypermethrin and an organic insecticide made out of organic plant extracts. No Spinosad. :/ So what should I go for now?

Abamectin is listed by University of Florida as a control for chili thrips. Cypermethrin was not effective in one study, but imidicloprid was effective. It is widely available in the West as Merit.