Effect of crop density of two genotypes of maize in the severity of gray leaf spot and yield in the second season crop

Rafael Rodrigues da Silva, Gustavo de Faria Theodoro, Cláudia Barrios de Libório, Luis Gustavo Amorim Pessoa

Abstract


Among the diseases that affect the corn crop and can reduce the yield, there is cercospora gray leaf, caused by Cercospora spp. This disease is very important in the second season crop or ‘safrinha’. The objective of this study was to evaluate the severity of cercospora leaf spot in transgenic corn hybrids Agroceres Yieldgard AG 9010 YG and Advance NK Agrisure TL (Bt11), using two plant densities: 78,000 and 100,000 plants per hectare. The results showed that the higher density of plants increased the severity of the disease and provided a lower yield. There was no significant interaction between hybrids and severity of the disease.


Keywords


Zea mays; Disease; Integrated control; Cercospora zeae-maydis; Cercospora zeina; Cercospora sorghi var. maydis.



DOI: http://dx.doi.org/10.5433/1679-0359.2012v33n4p1449

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional