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      Seed treatment affects Meloidogyne incognita penetration, colonization and reproduction on cotton Translated title: Tratamento de sementes afeta a penetração, colonização e reprodução de Meloidogyne incognita em algodão

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          The effect of abamectin, applied as seed treatment, on Meloidogyne incognita penetration, colonization, and reproduction on cotton was evaluated in two greenhouse experiments. Second stage juveniles (J2) penetration was evaluated 3, 9 and 15 days after germination (dag), whereas the nematode colonization was evaluated 27dag, by counting the total number of galls and egg masses per root system. Eggs and J2 were extracted from the roots to assess the nematode reproduction at 50 and 100dag. The seed treatment caused a decrease in J2 penetration in the roots, resulting in lower colonization and reproduction of M. incognita. These findings are discussed considering the environmental aspects of abamectin in the soil and the current practices for the crop management.

          Translated abstract

          O efeito de abamectina em tratamento de sementes na penetração, colonização e reprodução de Meloidogyne incognita, em algodão, foi avaliado em dois experimentos de casa de vegetação. A penetração de juvenis de segundo estádio (J2) foi avaliada aos três, nove e 15 dias após a germinação (dag), enquanto que a colonização 27dag foi avaliada por meio da contagem do número total de galhas e massas de ovos por sistema radicular. Ovos e J2 de M. incognita foram extraídos das raízes para determinar a reprodução do nematoide aos 50 e 100dag. O tratamento de sementes diminuiu a penetração dos J2 nas raízes, resultando em menor colonização e reprodução de M. incognita. Os resultados obtidos são discutidos tendo em vista os aspectos ambientais da presença de abamectina no solo e as práticas agrícolas em uso.

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          Most cited references 12

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          Ivermectin and Abamectin

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              Sensitivity of Meloidogyne incognita and Rotylenchulus reniformis to Abamectin.

               T Faske,  J Starr (2006)
              Avermectins are macrocyclic lactones produced by Streptomyces avermitilis. Abamectin is a blend of B(1a) and B(1b) avermectins that is being used as a seed treatment to control plant-parasitic nematodes on cotton and some vegetable crops. No LD(50) values, data on nematode recovery following brief exposure, or effects of sublethal concentrations on infectivity of the plant-parasitic nematodes Meloidogyne incognita or Rotylenchulus reniformis are available. Using an assay of nematode mobility, LD(50) values of 1.56 mug/ml and 32.9 mug/ml were calculated based on 2 hr exposure for M. incognita and R. reniformis, respectively. There was no recovery of either nematode after exposure for 1 hr. Mortality of M. incognita continued to increase following a 1 hr exposure, whereas R. reniformis mortality remained unchanged at 24 hr after the nematodes were removed from the abamectin solution. Sublethal concentrations of 1.56 to 0.39 mug/ml for M. incognita and 32.9 to 8.2 mug/ml for R. reniformis reduced infectivity of each nematode on tomato roots. The toxicity of abamectin to these nematodes was comparable to that of aldicarb.

                Author and article information

                Role: ND
                Role: ND
                Role: ND
                Ciência Rural
                Cienc. Rural
                Universidade Federal de Santa Maria (Santa Maria )
                June 2010
                : 40
                : 6
                : 1428-1430
                [1 ] Universidade de São Paulo Brazil


                Product Information: SciELO Brazil


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