I get several varieties too. Last summer I spent several months collecting and killing rose slugs and budworms. Have no idea which are which, I have ones dark green, sage green color and a tomato green. At least the pics I sent Baldo were ID'd as budworms. Had a big problem in CA last year, LA area down south and in the north. Mine definetly ate the buds, I could handle leaf damage, but I started going out twice a day collecting the caterpillars and feeding them to the toads. I put out houses for them and throw the worm down on the ground by their pot and knock on the top to get their attention. My SIL was very amused by this. I found it more satisfying that squishing them:) If I hunt I might be able to come up with a better pic. I don't have any mature trees, mine are all only a couple years old. The neighbors don't have any trees at all yet. So, I think I can definitely rule out the cankerworm. If some of them are hover fly larvae, I can't tell the difference and I'm not going to give them a chance to eat the buds and disappear.

Funny, the one at 12:00 looks like it has a pig's snout! This is the first year in at least 3 years that I haven't had an infestation of these nasties in my yard. My witchhazel is finally able to leaf out beautifully for the first time since planting it four years ago. I hate them! I've read they come in great numbers in cycles. Killing off the moths in summer helps, too, I think. I've scouted for the egg sacks, but have never spotted any. Also, checking for them when tiny (small and all black) helps. They seem to look different in every stage of their life. Good luck Ken.

At numbers greater than ten per square foot, they can cause damage. But if you don't see any damage, disregard them. GrubEx won't do much, if anything, to those--they're just about to pupate and turn into mature insects. To suppress them in the future, use GrubEx at bag rate when advised on the bag for your area (it's a pretty safe suppressant as opposed to trying to kill what you have, which is far more toxic). For me, that's May. I always do, but tend to have a bit of an issue. One year, I had thousands of square feet of turf float due to having the roots eaten. Digging showed uncountable grubs per square foot in September and I had to pull out the big guns. That's unusual, but it was a dry year and I had the only decent turf for miles. It must have been a beacon in July. So now I suppress it out yearly and use traps. Yearly, the number of Japanese beetles (the cause of my particular grub problem) has decreased from "yuck" to practically nothing. I also render the most-tasty shrubs and plants toxic to them.

If you put your nose right near the screen, the legs are readily seen. Caterpillars have ten abdominal body segments; the image above appears to have more than ten. With a limited photo, you really have to focus on the smallest details for an ID.