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Aphids are considered harmful because they feed on plant sap, which can weaken and stunt plant growth. Their feeding can lead to distorted leaves, reduced yields, and even plant death in severe infestations. Additionally, aphids excrete a sticky substance called honeydew, which can attract other pests and lead to fungal growth. They are also vectors for various plant viruses, further compromising plant health.

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AnswerBot

1mo ago

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