Control ofMeloidogyne chitwoodiin Commercially Grown Russet Burbank Potatoes

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Abstract
Efficacy of fumigant and nonfumigant nematicides alone and in combination for control of the Columbia root-knot nematode (Meloidogyne chitwoodi) was studied in a commercial Russet Burbank potato field. The soil-injected fumigant dichloropropene in combination with preplant ethoprop treatments significantly (P = 0.05) reduced tuber infection to commercially acceptable levels (.ltoreq. 3% nematode culls). The dichloropropene-aldicarb combination and sprinkler-irrigation-applied metam-sodium significantly reduced tuber infection, although percent culls was .gtoreq. 10. Single ethoprop, multiple ethoprop, and ethoprop-aldicarb combination treatments were less effective, with .gtoreq. 19% culls. Aldicarb alone and dichloropropene alone provided no significant (P = 0.05) nematode control, with .gtoreq. 84% culls. All treatments except sidedress aldicarb significantly increased total yield and estimated dollar return.

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