On-line version ISSN 1678-4499
VIANA, PAULO AFONSO and POTENZA, MARCOS ROBERTO. Non-preference and antibiosis of fall armyworm for selected corn genotypes. Bragantia [online]. 2000, vol.59, n.1, pp. 27-33. ISSN 1678-4499. http://dx.doi.org/10.1590/S0006-87052000000100006.
Insect pests is a major factor in limiting maize yields. The fall armyworm, Spodoptera frugiperda has been considered the most important field pest, reducing yields up to 34%. Insect resistance has been considered a low cost method of control, and represents a significant factor for preserving the environment. Several resistant lines have been released, although, the mechanisms of resistance have not yet been determined. This work was undertaken to investigate possible resistance mechanisms such as non-preference and antibiosis of S. frugiperda in some selected lines. The studies were conducted in laboratory and greenhouse at EMBRAPA/Maize and Sorghum National Research Center. The results demonstrated that the genotype CMS 14C has high level of antibiosis and 'CMS 24' and 'CMS 23' medium level. The choice tests indicated feeding non-preference to 'Zapalote Chico' and 'BR 201'. The genotypes CMS 14C and Zapalote Chico were less preferred for oviposition, compared with the remaining genotypes.
Keywords : Insecta; Zea mays; host plant resistance; Spodoptera frugiperda.