Troublesome aphids will steer clear of the Mexican marigold, and that can help protect your nearby zucchini. Besides aphids, marigolds also repel nematodes, cabbage worms, and mosquitoes.

Zucchini are often prolific ... A ready-to-use spray that kills worms and caterpillar stage insects while causing no harm to birds, earthworms, or beneficial insects. Approved for organic gardening.