Insect and Disease Identification Thread

Thanks for the responses. I heavily pruned off all visible signs of the disease before the pears leafed out. I sprayed dormant oil + sulphur at bud swell.

Current pics attached (the white spots are just Surround residue after a heavy rain). The only leafed-out fungicide treatment so far was one spray with sulphur mixed in with my standard Delegate and Surround treatment. It’s been very damp and a lot of rain for a few days here.

Based on some searches it definitely looks like pear scab. What’s your best fungicide recommendation? I have sulphur, copper, captan and neem oil on hand. I’ll read through existing discussions on here. Or should I rip the trees out? Again it’s only affecting Honeysweet and Flemish Beauty - all of my other varieties are pristine so far.


I spotted some unwelcome farmers on one of my two remaining mango seedlings in my greenhouse:

I had noticed some leaf deformation and figured it was some kind of sap sucker, but hadn’t seen any of the usual suspects yet. It looks like the ants are causing the damage to feed their herd. I guess it’s whatever these tiny (scale insects?) are:

The only other thing I spotted was this very fast moving little guy, some kind of arachnid I think?

Seemed fast enough to give me (perhaps false) hope it may be a predator mite species. I’ve certainly released enough of those on a nearby citrus tree in my vain effort to combat its spider mite infestation. I recently accepted defeat and removed that tree, though.

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This thing just was buzzing around the yard. It was larger than any other wasps or hornets I’ve seen and wasn’t afraid of me but I was pretty still also. Seemed interested to the ground near the edge of a fig tree in a pot. I’m always reluctant to kill things before I know if they’re friend or foe.

Anyone see one of these before?


…yes, one of the red spider mites. I have never seen a slow mite so I doubt that is a key to identification.

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Possibly one of the cicada killer wasps.

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Thanks, Google lens suggested that but my pic is kind of awful. The thick body and yellow eyes is what got me confused.

Anyone recognize what disease this pear has? Darker underside of leaves on the leader.

It doesn’t appear to be the standard fireblight we get here, though I could be wrong. There is also some discoloration of the leader, you may make out.

The first pic is from about 5 days ago, when I was getting ready to leave town, and then forgot to trim this out (for fear of it being fireblight).

The second pic is from today, the day I returned home. I sprayed some surround before leaving, as the Japanese beetles started to swarm my plums.

5 Days ago:

Today:

Thanks!!!

@rossn It’s powdery mildew. Spray with fungicide ASAP. I don’t know if you’re also experiencing extremely warm&humid weather, but I could spot young wild apple seedlings along the roads in my area around May by their white mildew coat. :frowning: Most of them may not make it through the summer.

White coating on the second picture is a Surround coat (kaolin clay), it’s not powdery mildew.

O.K., well a trick question for a trick question (misleading photo :wink: ) then: Is your pear variety particularly hairy/fuzzy and naturally dark on the underside of leaves? Or could it be a coating of fungal spores on the underside of the leaves and stem?
(And some leaf roller or moth is munching on the top leaves.)

ukie is right on the Surround… (I did mention it above… wasn’t trying to be sneaky). The underside of the leaves are normally not dark. Good question on the hairy/fuzzy… they are not normally, nor now. Below are a few close-up pics of a leaf on an adjacent Bartlett that also has some tips seeing the same symptom. The white dots are some surround overspray.

The top of the adjacent Drippin’ Honey is also munched. It has had earwigs near the tip of where the munching was going off that I’ve shaken off 2x in the last day. I have read here that earwigs will not eat a tree, though I question that based on what I’m seeing and my wife’s comments about earwigs eating her flowers. On the tree pictured above, I also found one little slug-looking (maybe a little flatter and darker, about 3/16" long) that I squashed before I realized I should have taken a pic. I found some of those on my container trees a month or two ago. I would have thought the Surround would have helped with both earwigs and those slimy guys.

Anyone have ideas on these leaves? I don’t think it’s fireblight, but the one shown above seems to have had some effect on the leader, as well.

These trees get hand watered, and not much this year… and it has been dryer than normal. I do wonder if this is a dehydration → death issue.

Edit: After looking up the slug, I think it is a pear slug.

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It’s definitely not a fireblight. I think something is sucking leaf juices. My young pear tree has similar symptoms on a new growth… just spotted some bug on it… but I do not stress about it, pears will recover.



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That looks like a spider to me, so it’s protecting your plant if anything.

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Yes, spider: note there are only two body segments. Bugs have three.

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Thanks. I did find a spider on mine as well, but figured he was hunting out bugs :slight_smile:

I had some leaves earlier this season that looked like yours. I think the difference between yours and mine is that my leaves are darkening on the underside, and you can see what may be some death in the leaves… yours show white structure whereas mine show brown.

I did notice the note on the Surround just waaay too late (sorry, it’s brain-meltingly hot here).
I personally don’t like the fuzz and the darker underside. To me those are telltale signs of fungus. Which may or may not be a problem, if the tree does not shed the leaves (a significant portion of overall foliage) as a result. But pears are tough as nails (disregarding fireblight or a real fire for this moment). We don’t use stuff like Surround here, except perhaps for commercial farmers, so maybe someone can tell from experience, but I would hazzard a guess, that it could dry the fungus to the point of no worry…
To be honest, I don’t spray established trees myself, but would keep an eye on a young tree with some copper sulphate at the ready.

As for the foliar damage, do you have pear moths in North America? We have a number of
pear specialists, that can do a number on our pear foliage and fruit. Our largest moth saturnia pyri for one.

What’s going on around the root of my Euro Plum? (the orange/brown nearest to the camera). I know I need to pull back the mulch.


Any ideas what this is on my raspberries. Never seen one before.