They are common where I live. Been finding them last couple weeks. They make their way to the top of the plant eventually like 90% of critters on plants. Everything is "seasonal" if you are messing outdoors and indoors. It's the risk you take when moving plants back and forth. They are easy to spot. Other critters are 2x's worse. They are on a "microscopic" level and stay undetected until you are in 4 or 5 weeks of flower. When growers start noticing the affects of infestations that they stopped spraying or treating for. Hard to eliminate all. You will still get patches of survivors. So look closely, you might see 1 or 2 leaves hidden down low for example. That's all it takes, if left unnoticed to for a long flowering plant.
It's a battle the rest of the way or end up cutting early to save what you got.