Supressividade dos nematóides Meloydogine javanica e Heterodera glycines em soja por adição de lodo de esgoto ao solo

Abstract

Supressiveness of nematodes Barueri and Franca, in São Paulo State, Brazil, during five years (1998-2002). In relation to the suppressiveness induction of nematodes, the sludge did not affect significantly the development of H. glycines in the soil, but reduced the M. javanica reproduction, in the soybean root.

Uso de Bacillus subtilis no controle da meloidoginose e na promoção do crescimento do tomateiro

“…Foi avaliada a presença de massas de ovos nas raízes de tomate segundo escala de notas proposta por TAYLOR & SASSER (1978) (0=0; 1=1 a 2; 2=3 a 10; 3= 11 a 30; 4=31 a 100 e 5=mais de 100 massas de ovos). Em seguida, as raízes foram processadas segundo ARAUJO & BETTIOL (2005), para determinação do número de ovos e juvenis infestantes.…”

Using Tannery Sludge to Manage Soybean Cyst Nematodes in Soybean Crops

“…Conversely, Araújo and Bettiol (2005) assessed the effects of sewage sludge incorporation in the soil on the suppressiveness of root-knot and cyst nematodes; they found that sludge incorporation did not reduce H. glycines incidence in soybean roots or affected their development, according to the assessment conducted two months after sowing. Therefore, it is essential conducting further studies in order to assess the effects of sludge on the biology of soybean cyst nematodes.…”

“…Thus, it is necessary finding alternative control measures able to cause less damage to the environment and to human health in order to help developing a more sustainable agriculture. Araújo et al, 2008;Martines, 2009;Santos, 2010), as well as to its capacity to activate the soil microbiota and suppress soil diseases (Lumsden et al, 1983;Araújo & Bettiol, 2005). According to some authors, the action mechanism of organic compounds results from decomposition processes, which release compounds (ammonia and fatty acids) with nematicide properties, fact that negatively affects phytonematode populations (Oka, 2010;Ferraz et al, 2010).…”

“…Another plausible justification lies on the fact that the sludge increases soil pH (Santos, 2010) and that pH near alkalinity does not favor nematode development (Massaroto & Yamashita, 2011). Different authors report that the application of organic sludge leds to satisfactory management of the nematode Meloidogyne javanica in soybean crops (Araújo & Bettiol, 2005;Araújo & Gentil, 2010). Renco et al (2007) studied the effects of different organic compound sources on Globodera rostochiensis survival and reproduction in potato cultivations and found that all the tested compounds significantly reduced the number of nematode eggs and juveniles.…”

Ação do lodo de curtume no controle de Meloidogyne spp. e na nodulação em soja

“…Para a avaliação da infestação de nematóides, as raízes frescas foram pesadas previamente e trituradas em liquidificador e em seguida quantificados os ovos e juvenis de nematóides (Hussey & Barker, 1973). O fator de reprodução foi calculado com base na relação entre o número de ovos de nematoide encontrado na raiz e o número de ovos inoculados no solo, conforme descrito por Araújo & Bettiol (2005). Os dados foram submetidos à análise de regressão, utilizando-se o programa Sisvar.…”