engleski

Susceptibility of Croatian maize hybrids to European corn borer

European corn borer (ECB) tunnel and feed within vascular tissues of maize whereas disrupt water and nutrient transport within plants. Occurred injuries predispose plant to stalk breakage and ear droppage, and may result in serious maize yield losses. The aim of this work is to evaluate susceptibility of maize hybrids to ECB. Two years of field studies were conducted among seven maize hybrids at Croatian site. Susceptibility to ECB was assessed by measuring tunnel length and number of ECB larva in dissected maize stalks. Grain yield was measured and calculated to 14% moisture level. Intensity of ECB attack in both years was 100%. Means for tunnel length were significantly higher in 2008 then in 2007. The extent of tunneling injury ranged between hybrids from 13.70 to 29.20 cm in 2007, and from 40.84 to 64.42 cm in 2008. Significant differences for tunnel length and number of larva among hybrids were found in both years. One larva in average was found in each dissected stalk, whereas mean number ranged from 0.96 and 2.16 in 2007, and from 1.28 to 2.03 larva in 2008, respectively. A significant positive correlation between tunnel length and number of larva has been observed for all hybrids in both years with exception of one hybrid in 2008 year. Our results indicate substantial variability among hybrids, and hybrid OsSK 602 showed tolerant characteristics. However, all investigated hybrids potentially may encounter detrimental effects of ECB attack.

European corn borer ; maize hybrids ; susceptibility

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