Who here has had a good outcome with purchasing predator bugs to eat pests? I have a rather annoying squash bug and cucumber beetle population demolishing my gourds, and my desire to kill pests is battling against my desire to not develop a weird cancer from pesticides (and also end up killing all the wolf spiders nearby).
I have an order of lacewings, nematodes, ladybugs, and mantises on the way. Anything else I should do? Neem oil didn't do much, and covering it all in netting seems unwieldy, as this is roughly a ~12x8 foot area with some 6-7 foot tall plants.
Next year plant buckwheat to attract tachinid flies (Trichopoda pennipes). In succession for the whole season, if you can swing it. They, and other good predator bugs, like the buckwheat pollen and nectar. Once they figure out that your garden is a good spot for sourcing that and squash bugs for their offspring, they'll keep coming back. They're easy to ID- they have orange butts and clear wings. They're not a quick fix for big populations. But they'll keep coming back year after year and will help over time.
Hand to bug combat is best for squash bugs really. Remove eggs and kill just hatched nymphs with blue tape and get a pair of hemostats for adult bug grabbing. Drown 'em in a container of water with a squirt of dish detergent in it to break up the surface tension. Bury them after they're dead- their stink attracts more. Squash bugs overwinter in garden debris and wood piles (and in junk on porches, unfortunately) so pre winter clean up is key. Handheld vaccuums are good for sudden and enormous invasions. But if you're overwhelmed sometimes it's best to skip planting squash and pumpkins for a season.
Mantids are fun and fascinating but their beneficial status is bullshit, IMO. Years ago I raised a few generations of those big Chinese ones (Tenodera sinensis) and I learned a few things that the online articles and beneficial bug sellers don't mention. (Or simply don't know because they're copy writers and not gardeners, ahem.) Like mantids only go after appropriate sized prey. When they're small they'll go after small bugs and flies. (And each other when they first hatch out, kek.) When they're big, they'll go after grasshoppers, bees of all kinds, and butterflies. And hummingbirds and small snakes. (Really. I saw both get gnawed with my own eyes.) They wiped out my local
Argiope aurantia spider population too
. Which was horrifying and the last straw. Considering how many beneficials they do eat (and how few garden pests, really) I kill them now whenever I see them. They're a threat to the good bugs I take pains to attract. Over three years of close mantid observation I never saw a mantid eat a squash bug or a Japanese beetle. Or a caterpillar or a slug. Or a cuke bug. Their eyesight is impressive and they will travel to wherever the action is, like hummingbird feeders and bee hives. And zinnia or goldenrod patches. Or simply out of the garden and into the tall grass nearby. I'd say that they prefer crunchy meals like grasshoppers and spiders most of all.
I had an angelica (the biennial, regular kind
-Angelica archangelica ) in a pot one year and when it bloomed its flowers became covered in lady bugs and lady bug larva. It was crazy, how many were on it.
The best garden predators as far as I'm concerned are the wasps and hornets. They carefully patrol all my plants and carry off the caterpillars and the aphids to their nests. The only drawback is that the second a monarch lays an egg and flies away, they're right on it.