Phuong, I was so hoping someone else would answer this because I no expert on this. Then I would like to say don't panic because I could easily be wrong.

To me this looks like the start of damage from chili trips. The only places in the United States that see Chilli thrips those with very warm climates. Florida and the gulf coast states. They just recently moved into California.

I shall hold on advice to see if someone else looks and knows for sure what it is. We shall wait a day for more help.

Thank you for kindly helping me here!

Last night I checked, I was thinking of rose midget - which I overlooked because I read it was native to America. I admit that I saw few bugs flying, but I didn't pat attention, since I was giving my rose the fish fertilizer I made ( sheepish smile, even my cats went crazy with the smell ! ) So for this point, I need to check but not sure I can get result since I have to work day job.

For Patty's suggestion, now to come of it. I have seen quite a few callous marks on this particular rose. At first, I thought it's just transportation damage. It went a long way from Thailand to Vietnam, after all. Then I see the tiny brown marks as oldrosarian said.I'm not sure from which insect, I will take a picture and hope you could help to check them out. I understand if you are not able to though, different in such a vast insect world, but I will try anything. The crazy part is, as of now, I don't have any bugs damage!

Last night on my instinct after reading about rose midget. I went out at midnight hoping to catch some of them lol but nothing in sight. I even tore of a dry shoot, took all big leavs out, and saw the tiny growth at the inner most, but no bugs or lava inside.

And this morning, I did the water spraying angrily, in hope I may drown the damn things off. And just to stress 1 thing, I already pour a river to all my rose since last time I burnt them with neem oil. Water is 100% reaching the bottom as I watch it pouring down the hole.

This rose has more of this problem that other. on my A Shropshire Lad, it happens like once in a while. On my Sister Emmanuel, none so far. On my fairy and vineyard Song, nope, best leaves I could see.

So heart breaking when all that effort is killed of by unknown enemy :(

When checking for Rose Midge they are to small to see. Much smaller than a mosquito and light brown with see thru bodies. Since putting out the yellow oil covered plastic cups I can see them with a hand held lens. My cups are covered with them. This is also a way to check for thrip with blue oil covered cups or sticky cards. My western flower thrips are also getting stuck on the yellow cups.

Any follow-up report on this problem which the OP was experiencing 5 weeks ago?

This is classic chili thrip damage. It's an insect that thrives in the warmest regions. It needs to to be treated with an insecticide contains Spinosad. I find the best way to control them is to spot spray all new growth that looks abnormal as it arrives.

What about the OP's photos, description or location is NOT consistent with midge? Her description and photos match exactly what I am observing in my rose garden here. She did say she would post a photo of the "tiny brown marks", though that was >2 months ago.

Still looks like chili thrip damage to me. The op lives in exactly the correct environment.

https://vietnamnongnghiepsach.com.vn/2017/06/09/rose-midge/

http://forums2.gardenweb.com/discussions/4710426/why-the-new-growth-is-burned-and-crispy?n=10

I have it too this year in New Jersey. I think its these very tiny light green bugs that look like grasshoppers. There is also a white flying insect around. I have used neem. Pyrethrim . Ordered Spinosid a few days ago. Very lush growth this year from lots of rain. I have been cutting back because the first bloom is over.

Any update, Phoung Bui?

fifis: it was thrips. And this year I have a very long and heavy infestation. I did everything I could, without poisionous chemical, mainly I use neem oil to keep them in check but it doesn't work very well. I also tried tobacco, hot chillie, cinnamon and nothing works. Sigh.

!!

What clinched the diagnosis for you, Phuong Bui?

Do you mean chili thrips?

Phuong, chili thrips are not like regular thrips. Normal thrips attack the buds, chili thrips however attack the new emerging growth. It usually looks like burnt crispy leaves. Nothing works on them except for a product containing spinosad. I’m not sure if that’s available in Vietnam, but it’s organic, although still poisonous. Howeber supposed to be less harmful than other insecticides. See if you can find it. Maybe ebay or amazon?

Phuong - Am I right in thinking that you use pots for your roses? If that's the case....you could cut some paper/plasti/cardboard into the shape of the pot and have a radius point cut through. Then you open the radius part and slip it around the rose. If it's midge/thrips...they can't fall into the pot and pupate....and every time you water, make sure you take the cardboard off....then put it back on. If you see tiny midge/thrips on the cardboard/paper/plastic (or whatever you use) you can squish them or spray them or something. This is just a thought...I've never tried it. Hope you can get rid of these terrible bugs!

Carol

Great suggestion, Carol. That's what I do with landscape fabric and it does work. With the fabric one doesn't need to remove it to water.

Landscaping fabric makes a whole lot more sense. LOL

It's great to hear that it works for you! That's something I'll have to remember if I ever need it. :)

Carol

Interesting thread, i have a similar problem on my roses.

Phuong can you post a photo of the foliage? Does your foliage look fairly good. If it is indeed chili thrips. The foliage will show the damage. Rose midge will definitely do the type of damage in the photo above. Rose midge does not damage your foliage.

You garden in pots so eliminating them is possible with landscaping fabric as mentioned above. Show your foliage if possible if it is good we will explain how to use the fabric.