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American Hazelnut Problem

16 years ago

Hi! I have an american hazelnut that is about 4-5 years old now (planted in spring 2004, from 2 foot bareroot stock). It has done okay so far and had nuts last fall. This spring however I have noticed what I thought was a bug problem at first, but now I'm wondering if perhaps it's a disease(?). I didn't noticed it at all in spring 2007 or 2006. First I found a bunch of ants running up and down a number of the twigs. On close inspection I can see what appears to be a roundish (sort of football shaped) nodules (some are more roundish though). I thought they were worms or some kind of bug because there appears to be a faint striped pattern that runs across (not lengthwise) the body of these things (sort of similar in appearance to the grain weevil (larvae) that is sometimes found in grains that have sit a while on shelf such as oatmeal, wheat cereal, macaroni, etc).

I picked a few of these "nodules" off and they are soft and can easily be squished. There appeared to be no damaged on the twig underneath the few I picked off. They vary in size from very small (1/64 or 1/32 inch) to about 3/16 inch or so. Most appear below or right around where a leaf bud exists.

I'm wondering if anyone has any idea what these things are, and if they are harmful? I did a quick research on the net and found eastern flibert blight as one disease of american hazelnut, but those symptoms to be different in appearance to what I'm seeing (also I'm in the west, specifically utah--not that the disease couldn't be found here, but it looks a lot different than what I'm seeing). Basically all I have done so far was spray the shrub with some ortho bug-b-gone and that zapped the ants, but my concern is these soft pustules (for lack of a better description) and how they could harm the plant.

Any help appreciated.. thanks

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Comments (4)

jean001
16 years ago
Black football shaped eruptions on hazelnut equals eastern filbert blight.

The challenge with this disease is that the evidence -- the black football lesions -- doesn't show up until a year after the infection occurred.
stanp
Original Author
16 years ago
Hi jean
Thanks for the reply. The problem though is that they're not black. Most are light brown to medium brown. Some are darker brown. And not all are football shaped. there are some that are football or oval, but many are just more roundish (not perfectly round though). As I mentioned I researched the EFB, and from the pictures I had seen it doesn't resemble what I have, and they appear to be a bit smaller. These things appear to vary in size, but some are quite roundish and big. They appear to clumb right around the leaf buds. I didn't even notice this earlier this spring (if it was present, they were a lot smaller then).
I guess I can attempt to try some things to treat it as if it were an EFB problem if that's even possible, or at least some kind of fungus. When you scrape them off, it's a whiteish color underneath and where it was attached to the twigs (doesn't appear to be any damage to the twigs where they were though).
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ken_adrian Adrian MI cold Z5
16 years ago
link to pix of jeans blight:

http://images.google.com/images?q=eastern%20filbert%20blight&ie=UTF-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=N&tab=wi

look at the link below for scale ... they sound a lot like the fletcher scale i had on a pine ... but i have no learning regarding such on filbert

try a more general search at google images for SCALE

ken

Here is a link that might be useful: link
stanp
Original Author
16 years ago
Hi ken! Thanks for the information and the link. Now that is more like what they look like. I checked some of the pictures, and indeed the fletcher scale is a very close match. I did some more searching and found another link to what is just referred to as 'soft brown scale', which also resembles it. And some of the pictures show a white powdery residue after picking them off (which appears to perhaps be eggs?), and that is indeed what I'm seeing on some. I kind of thought it looked like a bug, but they weren't moving and varied in size so I wasn't sure.
This appears to indeed be some kind of scale pest. It also may explain the ants I noticed on the twigs. Perhaps they were hunting the things down and silly me I zapped them with bug b gone lol. We did have one peach tree up until earlier this spring, and there is an old apricot orchard just above our property, so perhaps this is a common fruit scale (?)
So now I just need to find out how to get rid of the nasty things!! lol. One page I read mentioned some of these things are impervious to insecticides once they become bigger due to a waxy coating..ugh
Anyway thanks for the help or appreciate any other insight as well. I'll post the link that shows a lot closer resemblence to what I'm seeing on the american hazelnut.

Here is a link that might be useful: {{gwi:257216}}

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