Answer: One main difference between aphids and whiteflies is that whiteflies will fly away if you disturb the plant and aphids will just keep on munching. While aphids do fly, they're not as jittery as whiteflies! Whiteflies are difficult to control once they've populated and area; aphids can be controlled, but it takes time. Both can be controlled with repeated sprays of insecticidal soap. You'll have better success with the whiteflies if you spray in the early morning or late evening when the pests have settled down on the leaves and branches. Hope this helps!
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