Identification of sources of corn resistance to Spodoptera frugiperda (J.E. Smoth, 1797) (Lepidoptera : Noctuidae) under field conditions

The objective of this work was to identify sources of resistance to Spodopt era frugiperda (J. E. Smith) in six corn cultivars (CMS-22, CMS-35, AG-106, Dina-70, AG-510 and CMS-36) which were tested under field conditions using a complete randomized block design with four replications. The following p arameters were observed: a) foliar damage, obtained through a visual note s cale; b) larvae survival, weigth and length, measured 10 days after artific ial plant infestation. There were significant statistical differences (P=0. 05) among cultivars only in relation to foliar damage, being AG 510 the mos t resistant cultivar with an average damage of 5.41. The most susceptible c ultivars were CMS 35 and AG 106 which had an average damage of 8.38 and 7.8 5 respectively. Significant linear correlations (P=0.01) were found between . foliar damage and larvae weigth; foliar damage and larvae length; and lar vae weigth and larvae length, indicating the possibility of utilization of these parameters to evaluate resistance of corn cultivars to S. frugiperda.