Aphids On Plants Outdoors. Plus, when garden conditions are just right, aphids can reproduce at amazing speed, creating a huge, hungry colony in just a few days that can literally suck the life out of your plants. Aphids are crawling insects that generally lurk under plant leaves.
Check them for pests before bringing them in for the colder months. While there are some plants that naturally repel aphids, some others are known to attract them. I just pull my outdoor chair up to a plant and examine every leaf and every bud.
Grow young plants under row covers.
Leaves may be mottled or yellowing, turning brown and curling under. Some plants, such as mustards and nasturtiums, will actually lure aphids to them. Avoid breathing the spray yourself. For example, some species include bean aphids, cabbage aphids, potato aphids, green peach aphids, melon aphids, and woolly apple aphids.