Here's a thread with links to some info about the Sevin:
I don't think (unfortunately) that what you want to look for is one thing that will deal with the aphids and the cucumber beetles. Almost by definition that one thing would be so potent, it would be harmful to all your beneficials and the environment.
I think you need to keep dealing with problems as they come up with solutions that are as specific as you can. The aphids are easy, they are slow and soft-bodied. They will just sit there and let you squish them. I have a couple plants that get covered with aphids every spring (rose bush and trumpet honeysuckle). I go over them with a kleenex and squish all the aphids and they don't come back. Or the soapy water spray works well on them.
The cucumber beetles are hard shelled and more difficult. Here's some info about controlling them:
is an effective pest management strategy in some regions and cropping systems. Growers can avoid the first generation of cucumber beetles by keeping fields cucurbit-free until the establishment of summer cucurbits like cucumbers, pumpkins and squash intended for fall harvest. Delayed planting is an especially useful cultural strategy in cucurbits because this technique also bypasses first-generation squash bugs.
Floating row cover
s physically exclude both cucumber beetles and squash bugs during the seedling stage of plant growth. Providing a bug- and beetle-free period allows the plants to thrive and develop a mass of leaf and vine growth by the time row covers are removed at bloom. At this stage of vegetative growth, plants can withstand moderate pest attacks.
can deter cucumber beetles from laying eggs in the ground near plant stems. Mulches can also function as a barrier to larval migration and feeding on fruits
Predators and parasites
that prey on cucumber beetles include hunting spiders, web-weaving spiders, soldier beetles, carabid ground beetles, tachinid flies, braconid wasps, bats and entomopathogenic fungi and nematodes. Braconid wasps (Centisus diabrotica, Syrrhizus diabroticae) and tachinid flies (Celatoria diabroticae, C. setosa) are important natural enemies of cucumber beetles, with parasitism rates reaching 22 percent and 40 percent, respectively. Carabid beetles (Scarites spp. and Evarthrus sodalis) consumed all three life stages (larvae, pupae, adults) of spotted cucumber beetle, striped cucumber beetle and squash bugs in a laboratory feeding trial...Bats are voracious eaters of insects and more farmers are erecting bat houses to enhance biological control of crop pests.
Last resort pesticides
: a mixture of neem with karanja oil can reduce cucumber beetle populations by 50 to 70 percent . The botanical pesticides sabadilla, rotenone or pyrethrum have moderate effectiveness in controlling cucumber beetles. Sabadilla is toxic to bugs and honey bees, and sabadilla should not be applied when bees are present. Pyrethrum is also toxic to all insects, including beneficial species. These botanical pesticides are also highly toxic to fish until degraded.
All the above info from
This is aimed at commercial growers, so doesn't mention hand-picking, but for small growers that is also very effective and the most environmentally low impact.
is organic insecticide. It is a bacterial exudate. It is completely safe for human beings, does not affect us. However, it can be harmful to honeybees, if they contact the spray when wet. To avoid this, use the spray at dusk, after the honeybees have gone home for the day. Once it is dried, it is no longer harmful to them, but still effective for the target populations.
Also be sure your garden is very bird friendly. A number of birds will eat beetles, including grackles, starlings, crows, cardinals, meadowlarks, catbirds, english (house) sparrows, robins. All those nuisance birds do have a purpose!
What we are aiming for is a little mini -ecosystem in our yards that is in balance. A few cucumber beetles won't hurt anything, but an infestation of them can destroy your crop.