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Sawflies (2 Replies)

Posted October 26, 2017 at 8:56 pm

Another great edition of the Conifer Quarterly arrived today and I’ve already read it cover to cover.

I’m now looking for blue LED lights and a CO2 tank, aren’t you?

The article with the behind the scenes look into building and maintaining a conifer reference garden had a section that caught my eye on the topic of sawflies.

I try to keep good notes in my PlantsMap.com profile on all of my plants and I just searched through my listings and here are the plants where I’ve had sawfly infestations since I planted my first conifer in Virginia in 2013.

Pinus mugo var. pumilio – Didn’t see them on the plant and two days later all the needles were gone in the late summer of 2013. A second plant bit the dust from sawfly damage in 2016. A larger plant is surviving nicely but I watch for sawflies regularly.

Pinus banksiana ‘Uncle Fogy’ – Seems like I find eggs at random times of the year and see the larva normally in August.

Pinus contorta ‘Spaan’s Dwarf’ – Full blown larva attack in the late summer 2014. This plant was in full shade. It has recovered.

Pinus mugo ‘Dolly’s Choice’ – The pollen cones on this tree are so unique that finding the sawfly eggs is difficult because the mass of eggs looks like the cones after they have been on the tree for a couple of weeks. If you stare at the tree long enough for enough days in a row you can see changes and find the eggs, usually in the summer. (Eggs mid-summer 2015 & 2016)

Pinus sylvestris – Summer 2017 – Absolutely covered with eggs and larvae. After cutting back the dead branches and getting everything cleaned up I now have the most unusual pom pom topiary of this genus I’m sure.

Picea pungens (Table Mountain Pine) – No damage but lots of eggs in 2015 and 2016.

Pinus virginiana ‘Wate’s Golden’ – Eggs spotted in 2015

Cedrus deodara ‘Aurea’ (Oct 2017) – I was standing on my back deck last week and from 100 ft. away i noticed a brown branch on this tree. I later walked over and was trying to diagnose what caused the die back. After a while on another part of the tree I saw the larva. Then I spotted more eggs and then I spotted another group of larva. First time seeing sawflies on this genus around here.

Picea orientalis ‘Pendula’ (October 2017) – On the same night that I saw the larva and eggs on the Cedrus, I spotted a bundle of eggs on the very bottom branch of this tree. Which reminds me that I forgot to go cut that back!

I usually either cut out the eggs and destroy them or hose them off. A single spray of Seven takes care of the larvae.

Now that I’ve looked up all of this and put it in one place, I should probably try my hand growing a few roses.

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Posted October 28, 2017 at 11:20 pm

They get quite bad on the Slash pine (P. elliottii) and Loblolly pine (P. taeda) in my yard, and I have to pick the occasional cluster off of my Longleafs (P. palustris) as well.

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Posted October 31, 2017 at 11:36 am

Yikes! We do not have these. This would give me nightmares! ūüėČ

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