Dormant Sprays?

[turnyface]

What are people using for overwinter dormant sprays? I read on this site oil isn’t safe to use on Shimpaku junipers. Is that true?

Can I use this on Shimpakus, pines, maples, and an azalea?

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[Brian Van Fleet]

Check out Scott’s great resources on dormant sprays. I do use dormant oils and lime sulfur on my Shimpaku when temps are low enough.

Dormant Season Spraying Part 1: Broadleaf Deciduous Trees

Dec 16, 2018

Dormant season application of chemicals to prevent growing season issues with pests and diseases.

• markyscott
• Articles

Dormant Season Spraying Part 2: Lime Sulfur and Bordeaux Mix

Mar 1, 2019

Dormant season application of chemicals to prevent growing season issues with pests and diseases.

• markyscott
• Articles

Dormant Season Spraying Part 3: Pine Trees

Mar 1, 2019

Diagnosing and treating fungal problems on Japanese Black Pine and other types of pines

• markyscott
• Articles

 

[bwaynef]

Post in thread 'bwaynef's brimming-backyard barrage of burgeoning bonsai'

Jan 14, 2023

I sprayed everything. Junipers, pines, boxwoods, azaleas, and all my deciduous too. It ended up being a little later than I'd have liked, but... I went w/ the 5Tbsp/gal (or 2Tbsp/1500mL that my sprayer will hold) dilution as it was the lowest effective dilution for dormant plants. I read a few things about applying at >40ºF, but also that there's no documented proof that applying @ <40ºF causes any harm. I'd have preferred if we weren't going to dip below freezing overnight, but I also thought it better to get it done than put it off and not get around to it.

I wonder what my...

• bwaynef

I don't recall any ill-effects.

 

[turnyface]

Check out Scott’s great resources on dormant sprays. I do use dormant oils and lime sulfur on my Shimpaku when temps are low enough.

Dormant Season Spraying Part 1: Broadleaf Deciduous Trees

Dec 16, 2018

Dormant season application of chemicals to prevent growing season issues with pests and diseases.

• markyscott
• Articles

Dormant Season Spraying Part 2: Lime Sulfur and Bordeaux Mix

Mar 1, 2019

Dormant season application of chemicals to prevent growing season issues with pests and diseases.

• markyscott
• Articles

Dormant Season Spraying Part 3: Pine Trees

Mar 1, 2019

Diagnosing and treating fungal problems on Japanese Black Pine and other types of pines

• markyscott
• Articles

Great info, thanks!

What’s low enough temp wise for Shimpaku? I’m currently around 40’s now for average high/low.