The timing of the problem would lead one to think so. And there is this:
"Plants: While insecticides are not usually assumed to have adverse effects on plants, carbaryl's use as a plant growth regulator (chemical thinning agent) in apples95,96 makes effects on other plants unsurprising. The following four types of effects of carbaryl have been documented in crop plants:
* Effects on reproduction. Examples include a decrease in germination success in wheat97 and decreased germination and an increase in abnormal chromosomes in vetch.98
* Effects on growth. Examples include the inhibition of seedling growth in beans,99 disrupted cell division in onion,100 distorted growth in poinsettia,35 decreased growth in peas and vetch,19 and a decrease in the weight of bolls in cotton.101
* Effects on photosynthesis. Examples include reductions in the photosynthetic rate of pecan trees102 and young soybeans.103
* Effects on nitrogen fixation. Examples include reduced colonization and spore-formation of peanut mycorrhizae,104 interference with the nitrogen-fixing mechanisms of the soil bacteria Azobacter,105 decreased photosynthesis, growth, nitrogen-fixation, and survival of a nitrogen-fixing bacteria common in rice paddies,106,107 reduced growth of the nitrogen-fixing bacteria Rhizobium,108,19 and toxicity to another nitrogen-fixing bacteria.109
Carbaryl's primary breakdown product, 1-naphthol, is as toxic as carbaryl to several nitrogen-fixing microorganisms.105,109 The combination of carbaryl and 1-naphthol is synergistically toxic to one bacteria.109"
Please go read the whole article before you ever think about using Sevin in your garden again.
Incidentally the Sevin is not particularly effective against aphids anyway, but it does kill all the beneficial insects like ladybugs, that would have helped keep the aphids in check.
"Sevin (carbaryl) is not effective against many aphids so it is generally not a good choice for control unless recommended specifically. In fact, applications of Sevin may reduce the number of beneficial insects, such as lady beetles, and increase the potential for aphid outbreaks."
The green worms, probably tomato hornworms, are easy to hand pick off your plants. Aphids can be squished by hand or can be dealt with just by knocking them off with a hard spray of water or can be killed with soapy water spray (real SOAP, not detergent/ dishwashing liquid which can harm plants). Incidentally, I grow tomatoes every year and I have never seen a tomato hornworm. I don't know if they just aren't in my area or if it has something to do with having bird houses and bird feeders, so lots of birds.