Control of Meloidogyne javanica by Pasteuria penetrans

Sharma, R.D.; Vivaldi, L.J.

Pesquisa Agropecuaria Brasileira 34(11): 2065-2069

1999


ISSN/ISBN: 0100-204X
Accession: 003393304

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Abstract
In a greenhouse experiment, the efficiency of Pasteuria penetrans against Meloidogyne javanica was evaluated on soyabean cv. FT-Cristalina using 4 inoculum levels of the bacteria: 0, 10x105, 50x105 and 100x105 endospores/kg of soil. Immediately after inoculating the autoclaved soil with P. penetrans, 1000 second-stage juveniles were inoculated into each pot. After 48 h of nematode inoculation, a 3-day old soyabean seedling was transplanted into each pot. The experiment was evaluated in two steps, with the first evaluation made 89 days after transplanting the seedlings, and the second 90 days after soyabean sowing in sequence with a following period of 30 days. In the first evaluation, the highest fresh plant weight was observed in the treatment with 100x105 endospores/kg of soil which differed significantly (P<0.05) from other treatments except the untreated control. The maximum increase in fresh pod weight of the treatment with 100x105 endospores/kg of soil differed significantly (P<0.05) from the other treatments. The final nematode density in soil and roots for treatments 10x105, 50x105 and 100x105 endospores/kg of soil was significantly (P<0.05) lower than in the untreated control. The nematode control obtained for treatments with 10x105, 50x105 and 100x105 endospores/kg of soil was 50.9%, 89.1% and 81.8% respectively. In the second evaluation, the control obtained for treatments 10x105, 50x105 and 100x105 endospores/kg of soil was 94.7%, 99.7% and 100%, respectively, in comparison to the untreated control. P. penetrans was highly efficient in the control of M. javanica even at the lowest concentration (10x105 endospores/kg of soil).