Poplar trees are especially vulnerable to pests and diseases during the summer. In this post, we explore three major threats: yellow mildew after heavy rain, oak processionary moths (OAP), and tree borers like the Poplar Borer Beetle. Learn the signs to watch for, from leaf discolouration to dangerous caterpillar nests and tiny borer holes. If you suspect your Poplar is under pressure, Alt Arb can help with expert diagnosis and care.