RESUMOPalavras-chave adicionais: plantas antagonistas; nematóides das galhas, extratos botânicos.T he nema ticide a ctivity of a qu eou s extra cts of Wedelia (Sphagneticola trilobata), tridax daisy (Tridax procumbens), marigold (Tagetes patula), Mexican sunflower (Tithonia diversifolia), "botão de ouro" (Unxia suffruticosa) and Peruvian zinnia (Zinnia peruviana) was studied in vitro and in vivo on Meloidogyne incognita. The extracts were prepared at a ratio of 1.0 g of dry and crushed material to 10 ml of distilled water, stored for 24 hours, and then used in the experiments. In in vitro tests, 4.0 mL of crude extract and 2.0 ml of an aqueous suspension containing 200 nematode eggs were deposited on Petri plates of 5cm diameter and, fifteen days later, the number of hatched juveniles and the remaining eggs were counted to calculate the percentages of hatching. In in vivo tests, the extracts were separately applied by leaf spraying, root treatment and pouring onto the soil, weekly for 60 days. As control, only water was used in both experiments. The in vitro test showed that Ferreira, I.C.M.; Silva, G.S.; Nascimento, F.S. Effect of aqueous extracts of Asteraceae species on Meloidogyne incognita. Summa Phytopathologica, v.39, n.1, p.40-44, 2013. all extracts were effective in reducing the hatching of juveniles of M. inc ognita when compared to the control; the reduction percentages were 89.96%, 91.13%, 92.48%, 92.72%, 93.2% and 97.48% for tridax daisy, marigold, Mexican sunflower, Wedelia, "botão de ouro" and Peruvian zinnia, respectively, while in the in vivo assa y, trea tments did not have any effect on the root system weight of tomato plants; however, results differed between the used species and the way of application of the extract in the evaluation of the fresh weight of shoots. As to the reprodu ction ra te, none of the extra cts showed a sta tistica l difference, compared to control; however, compa ring the different ways of application, there was statistical difference when the extracts of trida x daisy a nd Mexica n su nflower were a pplied throu gh lea f spraying and root treatment, but there was no difference when these extracts were applied as irrigation on the soil.Estudou-se, in vitro e in vivo a atividade nematicida dos extratos aquosos de vedélia(Spha gneticola trilob ata), erva-de-touro (Tridax procumbens), cra vo-de-defu nto (Tage tes patula), girassol mexicano (Tithonia diversifolia), botão de ouro (Unx ia suffru tico sa) e zínia (Zinnia peruviana), sobre Meloidogyne incognita. Os extratos foram prepa rados na proporção de 1 ,0g do ma terial seco e triturado pa ra 10mL de água destilada e armazenados por 24h, sendo seguidamente utilizados nos experimentos. Nos testes in vitro, foram depositados 4,0mL do extrato bruto e 2,0mL de uma suspensão aquosa contendo 2 00 ovos do nematóide em pla ca s de Petri de 5 cm de diâmetro e, qu inze dia s a pós, procedeu -se a conta gem do nú mero de ju venis eclodidos e dos ovos remanescentes para o cálculo das porcentagens de eclosã o. Nos testes in v iv ...
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