Tsegaye Woldemariam

Effect of inoculation time and point of entry on disease severity in Fusarium graminearum, Fusarium verticillioides, or Fusarium subglutinans inoculated maize ears1

To determine if differences exist in the ability of three Fusarium species (F. graminearum, F. verticillioides, and F. subglutinans) to infect maize ears as the silks and kernels mature, one moderately resistant and two susceptible hybrids were inoculated at two points of entry (silk channel and kernels) in 1994 and 1995. Inoculations were conducted nine times for each part of the ear starting from silk emergence. For all three species, the greatest silk channel inoculated disease severities occurred when the ears were inoculated in the early stages of silk development, with a peak in susceptibility around 1–6 days after silk emergence, followed by a rapid decrease in severity. With kernel inoculations, a general decrease in disease severity occurred with time for all species. Fusarium verticillioides had the lowest disease severity of the three species. With silk channel inoculations, F. subglutinans resulted in higher disease severity than F. graminearum; however, the opposite was found with kernel inoculations, with F. graminearum producing the greatest amount of disease symptoms.Key words: Fusarium graminearum, Fusarium verticillioides, Fusarium subglutinans, maize, corn, inoculation, disease severity.

CO462 corn inbred line

Abstract: CO462 is a short season corn (Zea mays L.) inbred line with excellent combining ability with both Iodent and stiff stalk inbred testers as well as superior cold tolerance and intermediate resistance to common rust, eyespot, and fusarium stalk rot.

Common rust-resistant corn inbred lines CO457, CO458, CO459, and CO460

Abstract: CO457, CO458, CO459, and CO460 are the first corn (Zea mays L.) inbred lines released from the common rust (Puccinia sorghi Schwein.) resistance breeding program of Agriculture and Agri-Food Canada. All four inbreds possess extremely high levels of resistance, which is expressed in hybrids when these inbreds are combined with susceptible test lines. Acceptable grain yields and moistures are also achieved in some hybrid testcrosses. All four inbreds also possess intermediate resistance to eyespot [Aureobasidium zeae (Narita & Hirats.)].

CO456 corn inbred line

Abstract: CO456 is a short season corn (Zea mays L.) inbred line with excellent combining ability as well as moderate resistance to eyespot and intermediate resistance to common rust and fusarium stalk rot. Excellent hybrid yields and performance data were achieved when CO456 was combined with Iodent-type inbreds such as MBS8148 and TR1914.

CO455 corn inbred line

Abstract: CO455 is a short season stiff stalk-type corn (Zea mays L.) inbred line with excellent combining ability as well as intermediate resistance to common smut, common rust, eyespot and fusarium stalk rot. Excellent hybrid yields and performance data were achieved when CO455 was combined with Iodent testers such as MBS8148.