I don't know the name of this plant. It's a type of dwarf red-leaf bush/tree. The new leafs are red and turn to brownish green. Will neem oil help?

I think it is a type of maple that naturally shows changing green/red coloration. How long have you known this plant?

..... one of the dissectum variants of Acer palmatum (Japanese maple). It's not clear what damage or issue needs remediation, but high heat, too much sun, and too little water can cause appearance issues with foliage that includes necrotic leaf tips and margins or entire leaves or branches dying or being shed.

"Neem" covers a lot of territory. There are good products and snake oil that touts the product as containing neem oil even though the extraction (of the oil) process might well have destroyed the chemical nature of the active ingredient (azadirachtin) which provides the products insecticidal and anti-fungal properties.

As an insecticide, neem oils doesn't have much in the way of instant knockdown. Its effectiveness as an insecticide is as an anti-feedant (upsets digestion of the insects that feed on sap), an anti-feedant, an oviposition deterrent (anti-egg laying), a growth inhibitor, a mating disruptor, and a chemosterilizer. Azadirachtin, a tetranortriterpenoid compound, closely mimics the hormone ecdysone, which is necessary for reproduction in insects. When present, it takes the place of the real hormone and thus disrupts not only the feeding process, but the metamorphic transition as well, disrupting molting. It interferes with the formation of chitin (insect "skin") and stops pupation in larvae, thus short-circuiting the insect life cycle. It also inhibits flight ability, helping stop insect spread geographically.

The product with the most active ingredient is pure, cold-pressed neem oil, with no additives or vehicle (helps facilitate applications) added. If you decide to use it, ask how to use with the greatest efficacy. The product is highly reactive to alkaline hydrolysis, which means it should be used with water from a reverse osmosis filtration system, distilled water, or otherwise deionized water - air conditioner or dehumidifier condensate, rainwater or snow melt, e.g., and the water should be acidified with white vinegar or citric acid.

What benefit were/are you expecting from neem oil applications? It's also a so-so fungicide and like most fungicides it works best as a prophylactic as opposed to a remedial measure.

Al

So far we don't know exactly what you think is wrong with your maple, a type of tree that normally has a wide leaf color range. It's premature to suggest or use any product. Could just be heat damage that more water and a shade canopy will fix, or something more serious, but we need more info.

Can you send us better photos, closer and focused on exactly the leaves or parts that you're concerned about? Also, areas of the tree (leaves especially) that look normal to you — ie the way you're accustomed to them looking — for comparison? Get lower and send a side view of the tree as well as where the trunk emerges from the soil. Tell us:
How old is the tree,
What your weather has been like this summer,
What sun exposure does the tree have,
How often, how much you water,
If you've fertilized it, with what and how much, how frequently.

It's a 11-12 year old plant. It's limbs twist and turn not straight like a tree but more like a dwarf bush. It's leaves have always been a garnet color and never have had a problem. I haven't had to fertilize it but will if you think that would help. No changes in water, drip irrigation morning and late afternoon. Sunny in the morning until noon the sun then moved behind the house and it's in shade of the house afternoon. I don't know what an alphid is but I see my knockout roses beside this bush also showing signs of some type of attack to its normally vibrant green leaves. It was suggested to use Neem oil on them. ?? Just not sure what type of insecticide would help, or if that's the problem. Picture of closeup and the picture of what is healthy.

Look on the bottoms of the leaves for small, soft round shaped bugs. Those are aphids. If you have them, find a systemic for aphids. Anything you spray on a Japanese Maple will damage it - they are just too sensitive.

Don't fertilize with anything high in nitrogen as that will also cause damage. Low dosages of balanced fertilizer once or twice a year is really all it needs. This time of year, JMs do start to look raggedy so if you don't find insects... Have you had any hot dry winds? That usually finishes mine off for the year.

Thank you Lucy68 for your feedback. I'm not sure it's a Japanese maple, however, I looked up pictures and it looks close to a palladium garnet, perhaps in the same family? I didn't plant this but it was newly planted when I bought the house so I don't know the name. My concern also is that my knockout roses beside this garnet looks like they are dying . The leaves have brown spots, holes and spider-like webs amidst the bush. I think whatever is wrong with them has migrated? to this garnet tree? I'm going to have to cut extreme amount of the knockout roses and see if the garnet can be saved. I was gone all summer with a knee replacement surgery and unable to stay on top of the roses. I'm lost about what to do, but the roses have lost so many leaves. They have brown spots or something?? I live near Clemson and they have an agriculture department. Maybe they can help me. Appreciate your feedback. I'm including a picture of the roses and the not-so-garnet tree. It's leaves are curling on tips and brown.

Sorry to hear about the knee, Mollyata. And
Your tree is a Japanese Maple Acer palmatum. it could be the variety 'Garnet' but there are other similar red JMs and I don't think your tree can be positively IDd from your photos.
Japanese Maple (Acer palmatum)

I also suspect heat, as Lucy suggested. You didn't mention your weather this summer, but much of the country has suffered unusual heat waves. I question your watering schedule; although JMs do like soil on the moist side, twice a day sounds excessive. How long and how much water do they get each time? A deeper soak less frequently allows for healthier roots.

Here is a good guide for overall JM care
https://www.thespruce.com/japa...

Japanese maples and roses have very different cultural needs. The maple can be quite happy in half shade. Although knockout roses are known for being very resilient, they want full sun and less frequent watering. Soil pH and fertilizer needs are different also. Interesting landscaping decision by the previous owners.

About knockout roses
https://www.knockoutroses.com/....

Also, you would do well to post about the rose separately on our roses forum. Lots of experts there
https://garden.org/forums/view...

Btw, you might want to Google what you typed earlier —palladium garnet. Maybe you got autocorrected?

Your mention of webbing makes me think of spider mites. Perhaps give the plants a strong blast with the hose as a first step toward getting rid of them.

I thought maybe spider mite too. Look very very closely at the crooks and crannies were the webs are. You are looking for tiny red bugs in the spider webs. I doubt a blast of the hose will get rid of the spider mites for long. I would use a systemic on the roses and Japanese Maple. Make sure there are no flowers on the roses or you will kill the bees too.

Yes, your mystery red bush is a Acer palmatum (Japanese Maple). There are literally thousands of cultivars so narrowing it down to an exact one will be difficult. You can call it a "dwarf threadleaf Japanese Maple".

Pay attention to the watering suggestions from NMoasis.

Thank you all very much for your feedback and suggestions. Your expertise is evident to this newbie. ( also to post rose problem to the rose forum) I think I will pull my roses and try and save my Japanese maple. Thank you NMoasis for the link. It is spider mites so I am going to remove them and cut back on watering the Maple. We have had a hot summer in the upstate of SC but more rain than normal so watering didn't help.
Thanks again everyone! Glad you are out there willing to help.
Happy Gardening!
Mollyata

You're welcome and good luck

Lucy and Porkpal get credit for the spider mites suggestion!

Yes!! Absolutely 👌

Keep the soil damp. If the leaves start curling and drying, your JM needs more water.

Oh ok thank you Lucy! :⁠-⁠)