Hi there Elsie . unfortunately pine needles are best to be picked up with a broom and dustpan. the air ways in most vacuums are normally about an inch and a quarter in diameter , the pine needles end up wrapping around in the craziest fashion and end up getting stuck and forming blockages in the air paths . its a problem that's consistent with all vacuums.
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Hope this helped in some small minute way, have a great day