Help Identifying Nematodes

[ednaknightlora]

I am not sure what type nematode these are.  My guess for the first photo is bacteria feeding due to the simple lips. My guess for the last photo is a root feeding nematode. I have no idea for the middle photo.

Thanks!

Edna

[Jonathan Pineault]

I would say that the first one is bacterial feeder as you say.

The second would be, as I understand, bacterial feeder too. It does have a simple mouth, no sharp stylet inside the body. Still, it's a little bit out of focus

The third is probably a fungal feeder. It seems to have a sharp stylet near the mouth but it does not have any knobs at the end.


Here some photos of root feeding nematode:











You can clearly see the knobs at the end of the sting. The knob is attached to strong muscles that pull back the sting like an arrow on a bow. The knob is always light refracting so it's seems to me that it's always clearly identified versus a fungal feeder.


Fungal feeders:








Hope that helps!


Jonathan Pineault
permaculture designer
Québec, Canada

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[Jonathan Pineault]

I think that if you have good predatory nematode, it should control back the parasitic nematodes...

Of course having a good soil is the key. What the parasitics nematodes feed on? I bet the horse poop would have to be fastly decomposed with good soil biology. It seems also that some variation of mob grazing may be interesting to have the parasitc nematodes outcompeted by the pretadory and good nematode. Check out "mob grazing" and "Greg Judy" on Google and Youtube. Also, I would dig the soil to see if there is any compaction layer and bad smellies.

But I would rely on Elaine for that one!

@Elaine : any thoughts?

Jonathan Pineault
permaculture designer
Québec, Canada

Le 13/02/2013 12:43, Edna Lora a écrit :

Hi Jonathan,

Thanks. I thought so as well but for one thing... The nematode seems to have a high lipid concentration compared to other bacteria feeding nematodes.  I may be complicating things because not only am I looking at soil samples but I am also using predatory nematodes (Heterorhabditis Bacteriaphora) for the control of small hive beetles. The link is to  a photo of the non-feeding stage of H. baceriaphora.  

Since I work with horse farms, we also have to identify the gastrointestinal parasitic nematodes (mostly Cyathostomes).  The lifecycle includes two stages in the soil. 

I suppose that if I can identify the plant parasitic nematodes (the bad guys) and make sure there are good numbers of other types of nematodes I should be good to go. 

What do you think?

Edna

[Edna Lora]

Thanks Jonathan. All so interesting. We suggest rotational grazing. I don't know if horses would be too good at mob grazing because of their behavior. I know their owners wouldn't be! 

I agree that the key is healthy soil!

Edna

Sent from my iPhone

On Feb 13, 2013, at 4:01 PM, Jonathan Pineault <jona...@ecomestible.com> wrote:

I think that if you have good predatory nematode, it should control back the parasitic nematodes...

Of course having a good soil is the key. What the parasitics nematodes feed on? I bet the horse poop would have to be fastly decomposed with good soil biology. It seems also that some variation of mob grazing may be interesting to have the parasitc nematodes outcompeted by the pretadory and good nematode. Check out "mob grazing" and "Greg Judy" on Google and Youtube. Also, I would dig the soil to see if there is any compaction layer and bad smellies.

But I would rely on Elaine for that one!

@Elaine : any thoughts?



Jonathan Pineault
permaculture designer
Québec, Canada

<eihhihde.>

Le 13/02/2013 12:43, Edna Lora a écrit :

Hi Jonathan,

Thanks. I thought so as well but for one thing... The nematode seems to have a high lipid concentration compared to other bacteria feeding nematodes.  I may be complicating things because not only am I looking at soil samples but I am also using predatory nematodes (Heterorhabditis Bacteriaphora) for the control of small hive beetles. The link is to  a photo of the non-feeding stage of H. baceriaphora.  

Since I work with horse farms, we also have to identify the gastrointestinal parasitic nematodes (mostly Cyathostomes).  The lifecycle includes two stages in the soil. 

I suppose that if I can identify the plant parasitic nematodes (the bad guys) and make sure there are good numbers of other types of nematodes I should be good to go. 

What do you think?

Edna

On Mon, Feb 11, 2013 at 10:37 PM, Jonathan Pineault <jona...@ecomestible.com> wrote:

I would say that the first one is bacterial feeder as you say.

The second would be, as I understand, bacterial feeder too. It does have a simple mouth, no sharp stylet inside the body. Still, it's a little bit out of focus

The third is probably a fungal feeder. It seems to have a sharp stylet near the mouth but it does not have any knobs at the end.


Here some photos of root feeding nematode:

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You can clearly see the knobs at the end of the sting. The knob is attached to strong muscles that pull back the sting like an arrow on a bow. The knob is always light refracting so it's seems to me that it's always clearly identified versus a fungal feeder.


Fungal feeders:

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Hope that helps!


Jonathan Pineault
permaculture designer
Québec, Canada

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Le 11/02/2013 18:57, ednaknightlora a écrit :