Gadsden County Extension Column

One shot at nematode control: Why timing matters for farmers

As spring planting gets closer, farmers in Gadsden County are preparing for another

growing season. While most attention is on seed choices and fertilizer plans, there’s a

hidden threat beneath the soil that can quietly rob yields…nematodes. These tiny

roundworms attack plant roots, making it harder for crops to take up water and

nutrients. The result? Stunted plants, yellow leaves, and disappointing harvests.

Experts say nematodes are one of the toughest pests to manage because you can’t see

them until the damage is done. By the time symptoms show up in the field, it’s too late

to stop them. That’s why Dr. Bob Kemerait, a respected plant pathologist with UGA

Extension in Tifton, warns farmers: “You get one chance to make nematode control with

nematicides in the furrow.” In other words, the best, and often only, time to fight

nematodes is at planting, before the furrow is closed.

Once the seed is covered and the soil is packed down, nearly all options for nematode

control are gone. From that point on, the crop is on its own. If nematodes are present,

they’ll attack young roots early, reducing the return on every other input, fertilizer,

irrigation, and even fungicides, because the plant can’t grow properly.

So, what can farmers do? The first step is knowing what’s in your soil. UF/IFAS

Extension recommends soil sampling in the fall or winter to check nematode levels

before planting. The UF Nematode Assay Lab in Gainesville can identify species like

root-knot, reniform, and sting nematodes, which are common in North Florida. Each

species affects crops differently, so accurate identification is key to choosing the right management plan. The Gadsden County Extension Office can assist with soil collection

for nematode assays.

If nematodes are a problem, in-furrow nematicides can make a big difference. UF/IFAS

research shows that products like fluopyram (Velum Total) and granular nematicides

such as aldicarb (AgLogic 15GG) can protect roots during the critical early weeks of

growth. These treatments put the active ingredient right where roots and nematodes

meet, giving the crop a fighting chance. But timing is everything, if you miss that window

at planting, there’s no second shot.

It’s important to note that many nematicides are restricted-use chemicals and require a

valid Florida pesticide applicator license through FDACS. Some products, like aldicarb

(AgLogic 15GG), require additional permitting and regulations beyond the normal

restricted-use pesticide rules. For more information on aldicarb permitting, Dr. Zane

Grabau, UF/IFAS Extension Nematologist, has an article on the UF/IFAS EDIS website

titled How to Obtain an Aldicarb Application Permit for Florida Cotton or Peanut

(Publication Number ENY2095).

Chemical control isn’t the only tool. UF/IFAS also recommends crop rotation with non-

host crops, planting resistant varieties, and using cover crops to reduce nematode

populations over time. These cultural practices work best when combined with

nematicides at planting for fields with high nematode pressure.

Farmers should start planning now. Review your field history, consider pest pressure,

and contact the Gadsden County Extension Office for sampling and treatment options.

Nematodes may be small, but their impact is big. Missing that one chance at planting

can cost you yield and profit all season long. For more information, contact the Gadsden

County Extension Office or visit UF/IFAS online at https://edis.ifas.ufl.edu. With the right

plan and timely action, you can protect your crop and make 2026 a productive year.

Robbie Jones is the Agriculture and Natural Resources Agent/County Extension Director for UF/IFAS Extension Gadsden County.

Gadsden County Extension Column

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