White spots on shimpaku foliage

Hey y’all. I’ve got these white spots showing up on a single juniper that I’m worried about. What is this and how do I treat it? Thanks in advance!

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It looks like it’s probably scale insects. A systemic insecticide like imidacloprid or acephate ought to take care of them.


Got it. Immediately purchased This.

Hope it works, I’m worried! Thanks so much!


Okay follow up question. How do you recommend actually applying this stuff? Directions on the bottle are for a much larger area than a tiny pot, measured in fluid ounces per acre

My guess would be to dilute about a tablespoon in a quart of water (15 mL per liter or so if you’re metric), and put it in a spray bottle. That should give enough for several applications. I just skimmed through the instructions on Amazon’s website, though.

There’s really not much out there marketed to and packaged for bonsai people, is there?


The label directions on my container say “for foliar application mix 1.5 tsp per gallon of water and apply with a pump sprayer”.

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2 of my sabina junipers had these scales, took a while to clear up. I used systemics, once gone I have not seen them reappear. I also used Dr Bronner’s soap and made a spray solution - it has peppermint oil in it which may have helped, just apply early and spray off a few hours later. Or apply at night and wash off next day when you water. Protect from direct sunlight if using oil sprays. I think the dead scales will stay on for a while unless you try to rub them away.