Potato XXII – 11

Soil Fumigants and Nematicides

Gary D. Franc

Nematodes are microscopic soil-inhabiting worms that feed on roots and tubers. Nematicides may provide protection from infestations. Rotation to non-host crops also reduces the population of some nematode species. Trap crop may also be appropriate in certain situations. Verticillium wilt is caused by a soil-borne fungus. Fumigation may reduce losses from this disease by reducing the amount of soil-borne inoculum. Because some nematodes interact with the Verticillium fungus, reduction of nematode populations may also reduce losses from Verticillium wilt. Rotation to non-host crops and the incorporation of green manure also reduces loss from Verticillium.

Fumigants and nematicides are generally non-specific in their activity and are generally also highly toxic. As with all pesticides, proper caution must be exercised.

Product list for soil fumigation and nematodes:

Product	Disease	Product per Acre	Remarks
(grouped by active ingredient)
Aldicarb
Temik 15G NW Lock’n Load	Nematodes	20 lb per acre; 21 oz per 1000 ft of row	Apply granules with the seed pieces in the planting furrow and cover with soil or apply in a 6-inch band and work into the soil or cover with soil into a depth of 4 inches and plant seed pieces in the treated zone. Do not harvest within 150 days of an application in Idaho, Nevada, Oregon, Utah, and Washington.
1,3-Dichloropropene + Chloropicrin
Telone C-17	Nematodes	Broadcast gal per acre Mineral soil: 10.8 to 17.1 (use 21.6 for cyst-forming nematodes); Muck or peat soil: 27.4 to 30.0 Fl oz per 1000 ft per outlet Mineral soil: 31.8 to 50.2; Muck or peat soil: 80.6 to 88.2	Effective against wireworms and symphylans.
Ethoprop
Mocap 10% Granular	Nematodes (restrictions apply)	2.1 lb banded per 1000 row feet; 60 to 120 lb per acre broadcast	Effective against wireworms and symphylans.
Metam Sodium
Metam Sodium	Nematodes and Verticillium (Early Maturity Disease)	40 to 100 gal per acre	Some of the soil properties to consider when determining the application rate include soil texture, percent organic matter and depth of soil to be treated.
Nemasol 42%	Nematodes and Verticillium (Early Maturity Disease)	30 to 75 gal per acre	Some of the soil properties to consider when determining the application rate include soil texture, percent organic matter and depth of soil to be treated.
Nemasol 426	Nematodes and Verticillium (Early Maturity Disease)	30 to 75 gal per acre	Some of the soil properties to consider when determining the application rate include soil texture, percent organic matter and depth of soil to be treated.
The information herein is supplied with the understanding that no discrimination is intended and that listing of commercial products, necessary to this guide, implies no endorsement by the authors or the Extension Services of Nebraska, Colorado, Wyoming or Montana. Criticism of products or equipment not listed is neither implied nor intended. Due to constantly changing labels, laws and regulations, the Extension Services can assume no liability for the suggested use of chemicals contained herein. Pesticides must be applied legally complying with all label directions and precautions on the pesticide container and any supplemental labeling and rules of state and federal pesticide regulatory agencies. State rules and regulations and special pesticide use allowances may vary from state to state: contact your State Department of Agriculture for the rules, regulations and allowances applicable in your state and locality.

Categories: Potato, Soil fumigants, Nematicides

Date: 02/24/2002