What specialized, needle-like structures do yellow aphids utilize to pierce plant tissues and access sap?
Answer
Stylets
Yellow aphids do not chew or consume plant tissue; instead, they employ specialized mouthparts called stylets to feed. These structures are described as incredibly fine and needle-like. They are inserted into the plant surfaces, such as leaves, stems, or buds, specifically to pierce the tissues and reach the flow of phloem sap deep within the vascular system. This feeding mechanism allows for continuous sap ingestion throughout the day.
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