White sticky foam on stem of young avocado (one metre tall planted just 3 months ago). When wiped off leaves neat row of holes. See photos. Any help identifying and curing would be most welcome! I've just sprayed with soapy water for now... Drew
Young Avocado Pest
Certified GKH Gardening Expert
It is hard to know without seeing the culprit... but by your description, it sounds like a spittlebug. I use neem oil for such applications. just don't spray when the sun is bright. overcast is the best time.
Here is a link to articles with more solutions: https://www.gardeningknowhow.com/special/organic/