Why is applying a sharp spray of water an effective, low-impact control method against yellow aphids?
Answer
The force easily dislodges the aphid, interrupting its energy supply.
Physical removal through a sharp, hard spray of water is recommended for sturdy plants because it directly exploits the aphid's delicate feeding apparatus. The aphid maintains its position by keeping its stylets inserted into the plant tissue to continuously draw sap. The force of the water stream is sufficient to mechanically dislodge the small, soft-bodied insect from this feeding position. This immediate interruption severs their energy source, providing immediate control without resorting to chemical treatments like insecticidal soaps or oils, which work by suffocation or membrane disruption.
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