Resumos
Pratylenchus steineri n. sp. (Nematoda, Heteroderidae), novo parasito da batatinha (Solanum tuberosum L.), é descrita. A sua importância reside no fato de determinar, nos tubérculos, pequenas e numerosas pústulas, desvalorizando o produto proveniente de terrenos infestados. As lesões são superficiais, uma vez que no interior dos tubérculos os tecidos permanecem sadíos. Dá-se a distribuição da espécie no Estado de São Paulo, são fornecidas algumas anotações bionômicas, bem como outras relativas à sua importância como parasito. São também indicadas medidas de controle (seleção dos tubérculos-semente e rotação de culturas).
A new nematode, Pratylenehus steineri (Heteroderidae), that causes small pimples on the surface of potato tubers, is described. The disease is very similar to that incited by P. scribneri Steiner, 1943, in the United States. In the States, the disease was first studied by Scribner in 1889, who also determined its cause (1). Many years later, Steiner (4) published the description of the parasite. Pratylenehus steineri n. sp. closely resembles P. minyus Sher & Allen, 1953, from which it differs by its longer stylet, by the shape of its tail, and by some details in the organization of the ovary and lateral fields. P. steineri can be easily distinguished from P. scribneri by the more posterior position of the vulva. All developmental stages of the new parasite were found to occur in the potato lesions. The species seems to be monosexual since no males were found. A species of Helicotylenchus, not yet studied, was also obtained from the pimples. In addition, Eucephalobus sp., Ditylenchus sp., and another species of Pratylenchus were found associated with P. steineri in rare instances. In experimental potato fields belonging to the Instituto Agronômico de Campinas, Brazil, the percentage of tubers injured by the attack of P. steineri has ranged from 14.1 to 37.0 per cent in the last few years. The known area of distribution of the new species in the State of São Paulo, Brazil, is reported. Control measures are suggested that include crop rotation for 2 or 3 years, combined with selection of healthy seed.
Novo nematódeo parasito da batatinha
A new nematode parasite of potato tubers
Luiz Gonzaga E. LordelloI; Adiel Paes Leme ZamithI; O. J. BoockII
IEngenheiros-agrônomos, Escola Superior de Agricultura "Luís de Queiroz", Universidade de S. Paulo
IIEngenheiro-agrônomo, Secção de Raízes e Tubérculos, Instituto Agronômico de Campinas
RESUMO
Pratylenchus steineri n. sp. (Nematoda, Heteroderidae), novo parasito da batatinha (Solanum tuberosum L.), é descrita. A sua importância reside no fato de determinar, nos tubérculos, pequenas e numerosas pústulas, desvalorizando o produto proveniente de terrenos infestados. As lesões são superficiais, uma vez que no interior dos tubérculos os tecidos permanecem sadíos.
Dá-se a distribuição da espécie no Estado de São Paulo, são fornecidas algumas anotações bionômicas, bem como outras relativas à sua importância como parasito. São também indicadas medidas de controle (seleção dos tubérculos-semente e rotação de culturas).
SUMMARY
A new nematode, Pratylenehus steineri (Heteroderidae), that causes small pimples on the surface of potato tubers, is described. The disease is very similar to that incited by P. scribneri Steiner, 1943, in the United States. In the States, the disease was first studied by Scribner in 1889, who also determined its cause (1). Many years later, Steiner (4) published the description of the parasite.
Pratylenehus steineri n. sp. closely resembles P. minyus Sher & Allen, 1953, from which it differs by its longer stylet, by the shape of its tail, and by some details in the organization of the ovary and lateral fields. P. steineri can be easily distinguished from P. scribneri by the more posterior position of the vulva.
All developmental stages of the new parasite were found to occur in the potato lesions. The species seems to be monosexual since no males were found. A species of Helicotylenchus, not yet studied, was also obtained from the pimples. In addition, Eucephalobus sp., Ditylenchus sp., and another species of Pratylenchus were found associated with P. steineri in rare instances.
In experimental potato fields belonging to the Instituto Agronômico de Campinas, Brazil, the percentage of tubers injured by the attack of P. steineri has ranged from 14.1 to 37.0 per cent in the last few years. The known area of distribution of the new species in the State of São Paulo, Brazil, is reported. Control measures are suggested that include crop rotation for 2 or 3 years, combined with selection of healthy seed.
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LITERATURA CITADA
Recebido para publicação em 12 de março de 1954.
- 1. DYKSTRA, T. P Production of disease-free seed potatoes. Washington, U. S. Dep. of Agriculture, 1948. 64 p. (Circular n.° 764)
- 2. LORDELLO, L. G. E.Xiphinema brasiliense, nova espécie de nematóide do Brasil, parasita de Solanum tuberosum L. Bragantia 11:[87]-90. 1951.
- 3. SHER, S. A. & ALLEN, M. W. Revision of the genus Pratylenchus (Nematoda : Tylenchidse). Un. Calif. Publ. Zoo. 57:441-470. 1953.
- 4. SHERBAKOFF, C. D. & STANLEY, W. W. The more important diseases and insect pests of crops in Tennessee. Knoxville, Agric. exp. Station, 1949. 163 p. (Boletim n.° 186)
- 5. STEINER, G. Curso de Nematologia geral de plantas. Campinas, Instituto agronômico, 1951. 22 p. [Mimeografado]
- 6. ________ The nematode Cylindrogaster longistoma (Stefanski) Goodey and its relationship. J. Parasitology 20:66-68. 1933.
- 7. ________ Plant nematodes the grower should know. Tallahassee, Dep. of Agriculture, 1949. 47 p. (Boletim n.° 131)
- 8. THORNE, G. On the classification of the Tylenchida, new order (Nematoda, Phasmidia). Proc. helm. Soc. Wash. 16:37-73. 1949.
Datas de Publicação
-
Publicação nesta coleção
18 Maio 2010 -
Data do Fascículo
1954
Histórico
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Recebido
12 Mar 1954
