Roses forum→Those darn chilli thrips!

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California
CalPolygardener
Jan 14, 2020 9:47 PM CST
What am I gonna do to get the little monsters under control?!? I am the head rosarian for a semi-public garden with ~ 1000+ bushes in inland southern California and these things are mutilating and killing them (several varieties have completely died out) Sad . We've used an assortment of pesticides for the last 5 years and nothing has really worked. There are lots of alternate hosts around the garden so I know complete victory is impossible, but I'd like to stop the death and get back to something resembling the nice bushes we had before the invasion. I know the initial infestation began in Florida and moved west so I'm hoping someone who has been dealing with this longer has some controls that work a little better. Help me Gardening Forum, you're my only hope! Crossing Fingers!
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener
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SoCalGardenNut
Jan 14, 2020 10:21 PM CST
I've been spraying my roses with a bit of Dawn or Palmolive and lots of water. It seems to help except with tiny little buds, then that caused them to drop off. I find this solution cheaper, less toxic and I can spray anytime.
Plus I removed all the plants that are host for chilli thrips, like plumbago, Mexican heather, pepper plants. This year I had too many pepper plants, maybe that's the reason.
I try to grow everything, sometime not successful.
[Last edited by SoCalGardenNut - Jan 14, 2020 10:23 PM (+)]
Give a thumbs up | Quote | Post #2138562 (2)
Zone 9, Sunset Zone 9 (Zone 9b)
Roses
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Mustbnuts
Jan 15, 2020 8:27 AM CST
CalPoly Gardener, here is a link to one of the threads we had going on chili thrips. The thread "Potential biological control of spider mites, chilli thrips and white fly!" in Roses forum

I found the research to be interesting and the information valuable. Are you Pomona or SLO? I graduated from Pomona.
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener
Image
SoCalGardenNut
Jan 27, 2020 4:56 PM CST
I have lots of aphids on one of my tomato plants and I saw lots of thrips too, not sure they are chilli thrips or not. But I'm leaving them alone, not spraying because it could be beneficial for controlling thrips according to this article.

https://www.finegardening.com/...


I try to grow everything, sometime not successful.
[Last edited by SoCalGardenNut - Jan 27, 2020 8:15 PM (+)]
Give a thumbs up | Quote | Post #2146317 (4)
Name: Porkpal
Richmond, TX
Charter ATP Member Dog Lover Cat Lover Keeper of Poultry Keeps Horses I was one of the first 300 contributors to the plant database!
Garden Ideas: Level 2 Plant Identifier Raises cows Roses Farmer Celebrating Gardening: 2015
porkpal
Jan 27, 2020 8:13 PM CST
Interesting! I never spray and, if I have either aphids or thrips on my roses, I have never been aware of it.
Porkpal
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener
Image
SoCalGardenNut
Jan 27, 2020 8:17 PM CST
My roses in the front are not affected by chilli thrips. Maybe it's working. Who knows.
I try to grow everything, sometime not successful.
[Last edited by SoCalGardenNut - Jan 27, 2020 8:18 PM (+)]
Give a thumbs up | Quote | Post #2146427 (6)
Name: Carol
Alberta, Canada (Zone 3b)
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Canadian_Rose
Jan 28, 2020 1:44 AM CST
That is a wonderful article!! I love how things balance out like this! Every summer...I am in a constant squishing battle, leaving no aphids (as far as I can tell)...and I only have about 1 or 2 ladybugs. This year, I'm going to not squish...or just squish some. How cool!!

But...can too many aphids harm our roses?
Zone 9, Sunset Zone 9 (Zone 9b)
Roses
Image
Mustbnuts
Jan 28, 2020 6:53 AM CST
Did you ever get the impression that the original poster may be a fake? I thought that the moment it was posted.
Someone was looking for a quick and easy answer for a paper, test question, etc. There has been no response to what was posted. IF the person was at Cal Poly, they are both ag. schools with the best in library research, etc., that would be available at their finger tips. Also, Weeks has a test garden there along with Christian Bedard as the head honcho.
https://www.youtube.com/watch?...

I am always happy to help anyone with roses, as much as my limited knowledge can, so no gripes about what I have posted or what anyone else has posted, but still can't help wonder if this is real.
Name: Porkpal
Richmond, TX
Charter ATP Member Dog Lover Cat Lover Keeper of Poultry Keeps Horses I was one of the first 300 contributors to the plant database!
Garden Ideas: Level 2 Plant Identifier Raises cows Roses Farmer Celebrating Gardening: 2015
porkpal
Jan 28, 2020 7:38 AM CST
The tone of that post was odd, maybe not genuine. In that case, what was the point?
Porkpal
California
CalPolygardener
Jan 28, 2020 9:12 AM CST
Actually I am a real person, a graduate of Pomona, class of '85(GO BRONCOS!), and am currently working as a gardener specialist on the Landscape and Horticulture Services team at Pomona. It's the Kellogg Rose Garden that's taking it in the shorts and I'd like to recover it to it's former glory. I was reassigned 2 years ago and left it in other hands that didn't keep up (short-handed as usual state facility) *Blush* . I'm the passionate one that dedicated the most effort and it sort of fell by the wayside Sad .
Anyway, the thrips are really devastating and as I said most of our efforts have had limited impact. I was hoping someone in Florida, the first infestation area, or maybe somewhere between there and here would respond and give me some of their experienced input. I guess I'll have to go bother Christian to get his input as well. There really isn't much communication between facilities, academics and tenants unfortunately so I've had to find information anywhere I can.
Sorry if I sound fake, I'm tech-challenged, don't do this much and have a weird sense of humor. Please forgive and bear with me as I try to fit in. Sighing!


Name: Porkpal
Richmond, TX
Charter ATP Member Dog Lover Cat Lover Keeper of Poultry Keeps Horses I was one of the first 300 contributors to the plant database!
Garden Ideas: Level 2 Plant Identifier Raises cows Roses Farmer Celebrating Gardening: 2015
porkpal
Jan 28, 2020 9:49 AM CST
As suggested above, perhaps you need more aphids.
Porkpal
Coastal Southern California (Zone 13a)
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jerijen
Jan 28, 2020 12:29 PM CST
CalPolyGardener ... that garden has a long history, and good for you in working with it.

You know, what I would do, if I were you, is talk to Tom Carruth ... who is not only very familiar with your area, but has recent experience in dealing with this pest in a public garden. You can reach him through the Huntington Botanical Gardens, I would think.

If that doesn't work, contact me privately, and I'll connect you to him, OK?

A private message sent through the Heritage Roses Group facebook page will reach me:
https://www.facebook.com/TheHe...

So will a message sent through the HRG website:
http://www.theheritagerosesgro...
Zone 9, Sunset Zone 9 (Zone 9b)
Roses
Image
Mustbnuts
Jan 28, 2020 4:00 PM CST
Cal Poly Gardener--I am so glad you are real!!!!

Please take a look at the research I posted on chili thrips. Just click on the highlighted section and it will take you to the thread and research. This organic method of dealing with them sounds very promising.

Also, since Cal Poly is also one of my alma maters, I would love to know what is going on in the rose garden. I am glad you have decided to assist with getting the rose garden back in shape. We have very knowledgeable people here who can help or point you in the right direction. Many of us are stumped as well when it comes to dealing with these nasty critters. I do wish a hurricane would take them back where they came from!
Name: SoCal
Orange County (Zone 10a)
Lazy Gardener
Image
SoCalGardenNut
Jan 30, 2020 8:30 PM CST
I saw a hover fly today near my ZD rose. I think I need to not do anything and let nature takes over.
I try to grow everything, sometime not successful.
Kerala
Flame_Master
Feb 7, 2020 1:23 PM CST
I am not a professional in anyway. But I live in the tropics and I have a chilli thrips problem here right now as the temperatures climb and the season is dry. The plants in shade seem to be less affected than plants in full sun. My problem began when plants brought in from the nursery had chilli thrips which began to multiply rapidly in my non-shaded conditions. They spread to many plants here and eradicating them seems to be hard now.
I use Imidachloproid 17.8 SL as a foliar spray (3 mL in 10L water). It seems to work, as there is also an associated systemic action. I also use it as a soil drench near the plant roots (it is easily absorbed by the plant and transported through). A repeat application after 1 months is the recommended schedule, however I find that some plants manage to get hogged down by thrips way before that. It is somewhat under control. Overhead spraying of water, cooler temperatures, wet weather and shaded conditions seem to help control their reproductive rate in my conditions.
Name: Lynda Horn
Arkansas (Zone 7b)
Eat more tomatoes!
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gardenfish
Feb 17, 2020 7:41 AM CST
Imidachloprid and other similar chemicals are contributing to honeybee loss in the United States, and have been banned in the EU. I will not use ANYTHING that endangers bees.
“ Be kind whenever possible”
14th Dalai Lama
Name: Carol
Alberta, Canada (Zone 3b)
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Canadian_Rose
Feb 17, 2020 1:04 PM CST
Gardenfish - neither will I.

Flame_Master - have you tried the sticky traps? They work for me. You can buy them as blue or yellow strips. I think blue is the best color for attracting thrips. Or you can use blue cups that you paint with vegetable oil...I put them on sticks near my roses.
Kerala
Flame_Master
Feb 19, 2020 4:51 PM CST
@Canadian_Rose
I understand your apprehension about using an insecticide such as Imidachloprid. I heard Spinosad works just as well without the side effect of killing bees in the process.
However, Chilli Thrips are tiny insects, too small to be seen by naked eyes even as adults. They multiply rapidly and traps don't seem to work on them. I think they might work on the Western Flower Thrips which are larger. Spinosad isn't available here, where I am from (I also usually don't spray on open flowers, I suspect that doesn't do much since the insecticide is systemic - although I've also read that the chemical isn't likely to cross over into flowers that easily).
Since this pest wasn't here until I accidentally introduced it, I hope they become 'extinct' by the next wet season so that I don't have to spray for it. Bee conditions in my place of the world might be quite different from the ones there and I don't endorse any of these insecticides.
Name: Lynda Horn
Arkansas (Zone 7b)
Eat more tomatoes!
Lover of wildlife (Raccoon badge) Container Gardener Lilies Cat Lover Lover of wildlife (Black bear badge) Zinnias
Organic Gardener Heirlooms Bee Lover Hummingbirder Echinacea Tomato Heads
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gardenfish
Feb 20, 2020 12:54 AM CST
I can get Spinosad and have found it effective on many pest insects. Flame Master, you are correct about Imidachloprid being systemic and not being in the blossoms, but it has been found in the blossoms and nectar of squash flowers, according to the most recent scientific studies. As of right now, I don't know if studies have been done on ornamental flowers such as roses. The studies focus on the food crops that bees pollinate. Bees don't typically "pollinate" roses, though they will sometimes visit them for nectar, especially certain cultivars. It would seem that " imported " pests pose the greatest risks to our plants, because our plants have no natural defense to them. This is apparent for invasive plants, and animals also. kudzu, pythons, chili thrips, fire ants, African honey bees, varosa bee mite, emerald elm borer, Dutch elm disease, the list goes on....
“ Be kind whenever possible”
14th Dalai Lama
Name: Carol
Alberta, Canada (Zone 3b)
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Canadian_Rose
Feb 20, 2020 2:45 AM CST
And the beat goes on....and the beat goes on.

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