BAERMANN FUNNEL TECHNIQUE FOR NEMATODE LARVAE PRINCIPLE The Baermann funnel technique for detection of nematode larvae relies on the. 3) ISOLATION OF NEMATODES. The nematodes were then isolated using Modified Baermann’s Funnel Technique. (Baermann, ) (Figure ). This method. The Baermann funnel technique is now well known to nematologists, but the modification here described was devised to facilitate the collection of large numbers.

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If you want to compare types and numbers of nematodes extracted from soils representing different ecosystems i. Please click here for a downloadable powerpoint funnnel of the instructions above.

When you are ready to observe nematodes, carefully release the clamp on the hose attached to the funnel, and collect 5 to 10 ml of solution in a Petri plate or watch glass.

At this time, make sure that water is not leaking from the tube. Place circular piece of wire screen inside of funnel.

Extracting Nematodes from Soil with a Baermann Funnel

Add additional water to the funnel periodically once a day should be plenty to replace water that evaporates. To see the body structure of a nematode in more detail, you will need to examine it with a compound microscope. Contact Us – Report a Bad Link.

Baermann funnel A device used to extract nematodes from a soil sample or plant material. After about 12 hours they can be collected by drawing off the bottom centimetre of water. Plant-parasitic nematodes recovered from soil will be sluggish and slow moving whereas most free-living nematodes will be very active swimmers NOTE: You should be able to differentiate between stylet-bearing most likely plant-parasitic and non-stylet-bearing free-living nematodes at the highest magnification of the dissecting microscope.


Attach hose to funnel and place funnel with hose into ring of ring stand. The edges of the cover slip should be sealed with clear nail polish to prevent the water underneath it from evaporating. Purpose and Background Information. Place an open sheet of two-ply facial tissue over the supporting screen in the Baermann funnel, letting the edges of tissue drape over the outside edge of the funnel. Once your mount is completed, the nail polish supports will prevent your nematodes from getting crushed.

Materials and Methods

Retrieved December 31, from Encyclopedia. Gently spread the soil out in an even layer.

You want to warm it just enough so that the baetmann stop moving, but not too much or the nematodes will burst; you can check the progress by looking at this slide under your dissecting microscope. Fold over all four corners of the open tissue onto the soil placed on the tissue.

Arrangement of nail polish drops on microscope slide for preparation of a nematode mount for viewing under a compound microscope.


Let the Baermann funnel sit undisturbed for 24 to 48 tecnique at room temperature. Introduction to the Pathogen Groups. Place three or four drops of clear nail polish on a clean microscope slide so as to form the corners of a triangle or rectangle of a size that will support a cover slip FIGURE Learn more about citation styles Citation styles Encyclopedia.

Topics in Plant Pathology. Add tap water to the funnel until the water surface is barely touching the wire supporting screen.

Extracting Nematodes from Soil with a Baermann Funnel | Laboratory of Gregory L. Tylka

Plant Disease Mngmt Simulations. Being heavier than water, the nematodes pass through the muslin and sink to the bottom. Prepare a slide mount as follows. Observe solution with a dissecting microscope for the presence of plant-parasitic and free-living nematodes.

Then, copy and paste the text into your bibliography or works cited list. After the nematodes have stopped moving, place the cover slip so that it rests on the nail polish supports. The efficiency of the device is increased by gentle warming which immobilizes the nematodes. Restricted Area for Instructors.

Set up ring stand.