Found on one of my tomato plants. Is it a tomato hornworm? Ok. I can't upload the photo. "Image is too large". I have tried taking a second photo & uploading , receiving the same message. It appears to be a light green catarpiller, 2-3 inches long with tiny white projectiles coming out of it.
Taking another photo won't make it any smaller, you need to get a photo image editor so you can make the photo the size that the GS software will handle. It sounds like one...do a google search for tomato hornworm and see if it's the same.
I just Googled it. It is indeed a tomato hornworm but with braconid wasp cocoons on its back!! That apparently will gobble up this huge ugly creature when they emerge from their cocoons. Having written this, I will promptly put it back in the garden!
Good thing you didn't destroy it. I treasure those. my helper picked one off the tomatoes yesterday and didn't know what it was either... I put it back in the tomatoes.
If it's any help on saving tomatoes...this link below will help you. https://homeguides.sfgate.com/rid-caterpillars-tomato-plants-50520.html