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Screening of sweet potato accessions for resistance to Tetranychus spp. mites

W.R. Maluf^I; F.H. França^II; W.M. Moura^II; M.C. Branco^II; J.E.C. Miranda^II

^IBioplanta Tecnologia de Plantas Ltda., Caixa Postal 1141, 13100 Campinas, SP, Brasil. Send reprint requests to W.R.M.
^IICentro Nacional de Pesquisa de Hortaliças (CNPH)/EMBRAPA, Caixa Postal 07.0218, 70359, Brasília, DF, Brasil. Send plant germplasm requests to F.H.F. or J.E.C.M.

ABSTRACT

One hundred and twenty clones of sweet potatoes from the CNPHortaliças/EMBRAPA collection were screened for their relative susceptibility to spider mites (Tetranychus spp.) under field conditions. Four clones (BDI-001, BDI-004, BDI-009 and BDI-010, released as cultivars under the names Brazlândia Roxa, Brazlândia Branca, Brazlândia Rosada and Coquinho, respectively) were used as standards for "medium resistance" (M). Wide differences in mite susceptibility were found among clones: 89 were rated as medium resistant (M), 19 as highly resistant (R) and 8 as highly susceptible (S). The highest degree of mite resistance was found in BDI-053 (originally collected in Brasília - DF). All but two of the susceptible accessions were foreign introductions.

Keywords: screening; sweet potato; Tetranychus spp.; mites.

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