
These little critters with their protective helmet-like shields are just one variety of the approximately 8,000 species of scale. Though not all are harmful to your bonsai, the ones that are, need to be taken seriously.
Here’s what Michael Hagedorn has to say about scale
They’re here again…scale are emerging from their eggs underneath their shields, and beginning to crawl.
This is the time to control them. If we sprayed during the winter we wasted insecticide on protected eggs. In June they mature and begin moving around the plant, and can be controlled with oils. All-season oil or Neem oil work. Early summer through the warm months they are active.
It’s very important to identify when to control what. If we spray with the right insecticide or fungicide in the wrong season, we waste time and money and maybe give a beneficial organism a hard time.
Michael Hagedorn is a highly accomplished American bonsai artist, teacher and author. Michael is the owner of Crataegus Bonsai.
Continue reading Pests #2: Controlling Scale by Michael Hagedorn