Supply them an itty bitty portapotty and some toilet paper along with a little sign to clean up their mess. I suspect it's some sort of caterpillar. They tend to leave caterpillar poop and never clean up after themselves. They're very difficult to housebreak.

Yes probably a June bug (Cotinus), not the often-misnamed smaller reddish-brown May Beetle, but the BIG GREEN June Bug. They are beautiful beetles of the scarab family!! From everything I've read they are not really that harmful to fruit bearing plants, although they do feed on them to some extent. The grubs (larvae) can do some damage to lawns, if I remember correctly. But I don't worry about any of that so I don't know specific details.

Or perhaps the white things are cast skins of aphids. I do see aphids on the flower bud. Squish 'em or hose 'em off.

Good idea, Jim, that would be sturdy & easy to clean. What store did you get it from? I will have to look for that. One healthy rose worth buying: William Shakespeare 2000, I never find any Japanese Beetle on that for the past 4 years, since its petals are tightly-packed, and JB can't get inside. I have W.S. 2000 in a flooded area, with the overflow of rain barrel dumping water on that tiny rose, yet it's clean. I also put gypsum (for its zillion-petals), and cracked-corn in the planting hole (for anti-fungal agents in corn, such as zinc and copper). How one prepare the planting hole determines how disease-resistant it is. If the hole is well-drained, and has beneficial microbes, it will be healthy. When I piled up horse manure on Golden Celebration, I was surprised that the previously compacted soil underneath is made fluffy, thanks to the microbes from the well-rotted manure. The below link explains why: http://www.naturalenviro.com/Article.php?ArticleSKU=Soil-Building "The broad and diverse population of soil microorganisms will immediately begin to build an aerobic zone in the soil. The aerobic zone is the top portion of the soil that supports plant life. A healthy soil will normally have an aerobic zone 8-12 inches deep. Most soils today have an organic matter content of less than 1% and usually have very shallow aerobic zones (1-2 inches). One of the main causes of this is the lack of diverse population of beneficial soil microbes. Soils that have low organic matter and shallow aerobic zones also have a very low water holding capacity, are compacted, and have very low oxygen content. These conditions are very adverse to good root development by turf or plants and usually indicate very low microbial activity. When you apply microbes, you will see conditions in your soil begin to change quickly." An excerpt from another site on humus: http://www.naturalenviro.com/Article.php?ArticleSKU=humic-acid-role "Humic acid is also especially important because of its ability to chelate micronutrients increasing their bio-availability. Humic acid stimulates microbial activity by providing the indigenous microbes with a carbon source for food, thus encouraging their growth and activity. Soil microbes are responsible for solubilizing vital nutrients such as phosphorus that can then be absorbed by the humic acid and in turn made available to the plant. Additionally, microbes are responsible for the continued development of humus in the soil as it continues to break down not fully decomposed organic matter." William Shakespeare 2000 as own-root can take lots of rain. I look over the pictures over the last 4 years, including the 1st year when it was in a pot, with chemical fertilizer. My rating: it was really stingy in a pot, from high-nitrogen-soluble. It gave lots of bloom with sulfate of potash & gypsum, but the health can't be compared to horse manure. This year with too much rain: I used red-lava-rock & cocoa mulch, bloom-quality is good, but leaves got holes from excess water, but no black spots. Below is William Shakespeare when I used horse manure & alfalfa meal, 100% healthy, fantastic bloom-color and quality: Here's William Shakespeare 2000 bloom with horse manure: nice purple, thanks to the trace elements in horse manure. I like more than what I have now, deep crimson from red-lava-rock: