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Effect of Crotalaria Spectabilis and Two Nematicides, On Numbers of Meloidogyne Incognita and Helicotylenchus Dihystera

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An experiment in an infested field indicated that Crotalaria spectabilis at 17 or 34 plants/m2, Nemagon 20G (granular formulation with 20% dibromochloropropane) at 3, 6, or 9 g/m2, or Basamid (powder formulation with 85 % dazomet at 25, 50 or 75 g/m2, decreased numbers of Meloidogyne incognita juveniles by 90% within 2 months. During the first 2 months after planting, C. spectabilis did not decrease numbers of Helicotylenchus dihystera, whereas Basamid at all three rates and Nemagon at 6 and 9 g/m2 decreased numbers by approximately 90%. Nemagon at 3 g/m2 gave less than 50% control of H. dihystera. Okra (Hibiscus esculentus) grown for 6 months on land previously treated with Basamid or Nemagon doubled numbers of M. incognita compared with untreated land planted with the same crop. No such increase occurred in land planted with C. spectabilis for 2 months followed by okra. Okra had no effect on H. dihystera whereas M. incognita was scarce in soil where C. spectabilis had been grown for 8 months.

Affiliations: 1: Dept. de Biologia Vegetal; 2: CENAGREN de Brasília, EMBRAPA, Brasilia, DF, Brazil; 3: Dept. de Engenharia Agronômica, Universidade de Brasília


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