Popcorn germplasm resistance to fungal diseases caused by Exserohilum turcicum and Bipolaris maydis

Management of Turcicum Leaf Blight of Maize Caused by Exserohilum Turcicum in Maize

Seven fungicides were evaluated in vitro against Exserohilum turcicum causing leaf blight of maize The treatment mancozeb 0.25% and combination treatments of carbendazim and mancozeb i.e. saff 0.25% recorded the lowest percent disease index (PDI) reducing the disease by 73.0% and 72.1% respectively. The treatment which had a combination metriram + pyraclostrobin i.e. cabriotop 0.3% was found to...

Asyptomatic Fungal Cyst of Conjunctiva Caused by Bipolaris Spicifera

An asymptomatic fungal cyst of a conjunctival infection was found and removed by biopsy in a young shepherdess. Histopathologic evaluations of the excised tissue specimen from the lesion of the conjunctiva demonstrated an epithelium lined cavity containing a tangled mycelial mass that was surrounded by inflammatory cells and the fungus was identified as Bipolaris spicifera. It is concluded that...

New resistance genes in the Zea mays - Exserohilum turcicum pathosystem*

The use of monogenic race-specific resistance is widespread for the control of maize (Zea mays L.) helminthosporiosis caused by Exserohilum turcicum. Inoculation of 18 Brazilian isolates of E. turcicum onto elite maize lines containing previously identified resistance genes and onto differential near-isogenic lines allowed the identification of new qualitative resistance genes. The inoculation ...

Evaluation of popcorn germplasm for resistance to pink stem borer

PHYSIOLOGIC SPECIALIZATION OF Exserohilum turcicum, IN KENYA

Isolates of E. turcicum from Kenya showed variation in growth rates when grown on potato dextrose agar at 22C. Most colonies reached a diameter of 9 cm in 7 to 11 days. Single-spore colony colors were similar, appearing whitish with a greenish tint that disappeared during and after onset of sporulation. Nineteen isolates were inoculated on Ht-bearing differentials of maize. Three isolates were ...