Resumo
The writers report results on the application of four fumigants (D. D., E. D. B.-40, C. B. P. and Vapam) for control of root-knot and meadow nematodes attacking potato in beds filled with soil artificially inoculated. The data obtained were as follows: a) as reported by previous authors, potato is sensitive to C.B.P., the toxical effects of which disapearing only about 6 and half months after application. On the other hand, C.B.P. proved to have a significative residual nematicidal value, protecting the seeds from root-knot nematodes for a period of two years; b) D. D., E. D. B., and Vapam were effective for controling root-knot but with no residual value, having to be used prior to each planting; c) at the rates used, no nematicide was effective to control meadow nematodes; d) in the conditions of the experiments, all nematicides incited attacks bv Streptomyces scabies. Actually, in some cases scab did not affect any tuber from the check while the entire production from the treated beds was heavily desfigured. The writers assume that as the nematicides killed protozoa and too many bacteria-eating nematodes, they destroyed the biological equilibrium existing in the soil, thus allowing the S. scabies population to reach a high level.
IInst. Agron. do Est. S. Paulo
IIE. S. A. «Luiz de Queiroz»
SUMMARY
The writers report results on the application of four fumigants (D. D., E. D. B.-40, C. B. P. and Vapam) for control of root-knot and meadow nematodes attacking potato in beds filled with soil artificially inoculated.
The data obtained were as follows: a) as reported by previous authors, potato is sensitive to C.B.P., the toxical effects of which disapearing only about 6 and half months after application. On the other hand, C.B.P. proved to have a significative residual nematicidal value, protecting the seeds from root-knot nematodes for a period of two years; b) D. D., E. D. B., and Vapam were effective for controling root-knot but with no residual value, having to be used prior to each planting; c) at the rates used, no nematicide was effective to control meadow nematodes; d) in the conditions of the experiments, all nematicides incited attacks bv Streptomyces scabies. Actually, in some cases scab did not affect any tuber from the check while the entire production from the treated beds was heavily desfigured.
The writers assume that as the nematicides killed protozoa and too many bacteria-eating nematodes, they destroyed the biological equilibrium existing in the soil, thus allowing the S. scabies population to reach a high level.
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LITERATURA CITADA
Recebido para publicação em 12/8/60.
- BOOCK, O. J., 1951 - Combate aos nematódeos pela aplicação de fumigantes no solo. Efeito do D.D. e Dowfume W-40 no combate aos nematódeos formadores de galhas em tubérculos de batatinha. Bragantia 11: 13-18.
- BOOCK, O. J., 1955 - Variedades de batatinha - Solanum tuberosum L. - Comportamento de 58 variedades em experimentação no Estado de São Paulo, 103 pp., 3 ests., tese de doutoramento, Escola Superior de Agricultura «Luiz de Queiroz», Piracicaba.
- CHRISTIE, J. R., 1959 - Plant nematodes: their bionomics and control, XI + 256 pp., Un. of Florida ed., Gainesville.
- DIETER, C. E., 1954 - Factors affecting results with soil fumigants. - Plant Dis. Reptr. supp. 227: 98-101.
- GOODEY, T., 1951 - Soil and freshwater nematodes, a monograph, XXVI -f 390 pp., Methuen & Co. Ltd. ed., Londres.
- KINCAID, R. R. & G. M. VOLK, 1949 - Soil fumigation for cigar-wrapper tobacco in Florida. Phytopathology 39 (1):11.
- LORDELLO, L. G. E., 1955/1956 - Experimentos com os nematicidas D. D., E.D.R. e brometo de metilo no combate aos nematódeos causadores de galhas em raízes de plantas (Meloidogyne spp.). An. Esc. Sup. Agric. «Luiz de Queiroz» 12/13: 167-177.
- LORDELLO, L. G. E. & F. A. M. MARICONI, 1953 - Biologia da Arsenura xanthopus (Walker, 1855) (Lepidoptera - Adelocephalidae), praga do «açoita cavalo» (Luehea spp.) e notas sôbre seus inimigos naturais An. Esc. Sup. Agric. «Luiz de Queiroz» 10: 189-216, 5 ests., 4 quads.
- LORDELLO, L. G. E., O. J. BOOCK & A. P. L. ZAMITH, 1954 - Novo nematódeo parasito da batatinha. Bragantia 13: 141-149.
- OVERGAARD NIELSEN, C, 1949 - Studies on the soil microfauna. II - The soil inhabiting nematodes. Natura Jutlandica 2: 1-131.
- TAYLOR, A. L., 1951 - Chemical treatment of the soil for nematode control. Advances in Agronomy 3: 243-264.
EXperimentos com os nematieidas D. D, E.D.B., C.B.P. e Vapam no combate aos nematódeos que parasitam a batatinha em São Paulo
Datas de Publicação
-
Publicação nesta coleção
10 Set 2012 -
Data do Fascículo
1960
Histórico
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Recebido
12 Ago 1960
