Instead of applying fertilizer all at once, feed your plants smaller amounts of nutrients throughout the season, or use an organic slow-release fertilizer only when needed.
Plants are more defenseless during hot, dry conditions, as they’re not able to produce the chemicals they need to fend off pests.
A popular method of pest control among greenhouse growers is using “banker plants” to introduce parasitic wasps as a biological means of pest management.
Aphids especially hate the strong scent of marigolds and catnip, so they make great companion plants for valuable crops you’re trying to protect.
Good trap crops for aphids include nasturtiums, calendula, and nettles. Once the aphids swarm these sacrificial plants, pull them up and throw them in the trash.