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

Do not add the cover slip yet. Supplemental Information and References. Carefully add additional water to the funnel until the water surface is almost above the top of the tissue. 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 Secure clamp to hose attached to funnel.

Purpose and Background Information. Please click here for a downloadable powerpoint presentation of the instructions above. Now it is time to look at your nematodes with a compound microscope. A muslin bag containing the sample is submerged in water in a funnel sealed at the lower end by a rubber tube and clip. Fold over all four corners of the open tissue onto the soil placed on the tissue.

Extracting Nematodes from Soil with a Baermann Funnel

You want to warm it just enough so that the nematodes stop moving, but not too much or the nematodes will burst; you can check the progress by looking at this slide under tchnique dissecting microscope. Place circular piece of wire screen inside of funnel. Add additional water to the funnel periodically once a day should be plenty to replace water that evaporates. Next, use a Pasteur pipette or eyedropper to place a drop of water containing nematodes in the center of the dots.


Let the Baermann funnel sit undisturbed for 24 to 48 hours at room temperature.

Prepare a slide mount as follows. Print this article Print all entries for techique topic Cite this article. If tube is leaking, re-adjust hose clamp until leaking stops.

Restricted Area for Instructors. Observe solution with a dissecting microscope for the presence of plant-parasitic and free-living nematodes. Gently spread the soil out in an even layer. Arrangement of nail polish drops on microscope slide for preparation of a nematode mount for viewing under a compound microscope.

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Add tap water to the funnel until the water surface is barely touching the wire supporting screen. Plant Disease Mngmt Simulations. Attach hose to funnel and place funnel with hose into ring of ring stand.

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Diagram of Baermann funnel for extraction of nematodes. Because each style has its own formatting nuances that evolve over time tunnel not all information is available for every reference entry or article, Encyclopedia.

Baermann Funnel |

Cite this article Pick a style below, and copy the text for your bibliography. Topics in Plant Pathology. Being heavier than water, the nematodes pass through the muslin and sink to the bottom. Warm this drop of water by passing the slide six to eight times over the flame of an alcohol lamp to relax the nematodes. Modern Language Association http: Learn more about citation styles Citation styles Encyclopedia.

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. Plant-parasitic nematodes recovered from soil will be sluggish and slow moving whereas most free-living nematodes will be very active swimmers NOTE: The edges of the cover slip should be sealed with clear nail polish to prevent the water underneath it from evaporating.


If you want to compare types and numbers of nematodes extracted from soils representing different ecosystems i. 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. Free-living and Plant-Parasitic Nematodes Roundworms. At this time, make sure that water is not leaking from the tube.

Stories of Plant Diseases. Do not use facial tissue that has moisturizing lotion incorporated into the tissue. Once your mount is completed, the nail polish supports will prevent your nematodes from getting crushed.

Introduction to the Pathogen Groups. To see the body structure of a nematode in more detail, you will need to examine it with baeemann compound microscope. Diagnostic Assay Validation Terminology. After the nematodes have stopped moving, place the cover slip so that it rests on the nail polish supports.

When you are ready to observe bwermann, 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. Set up ring stand. The efficiency of the device is increased by gentle warming which immobilizes the nematodes.