Phytoparasitica (1997) 25, p. 231 (Aboul-Ata et al.)

A.E. Aboul-Ata, J.-C. Thouvenel, D. Marshall, Sh. Abo-El-Saad and M. Satour (1997)
Severe epidemic caused by virus diseases in Egyptian corn
Phytoparasitica 25 (3), 231-231
The Xth International Congress of Virology, August 11-16, 1996, Binyanei haOoma, Jerusalem, Israel, poster
Abstract: A severe stunting and yellowing phenomenon invaded most corn fields in Middle Egypt (Giza, Beni Sweif, Fayium and Minia) in the 1991 growing season. Several fields were overturned because of the severe infection in Fayium and Beni Sweif. The cause was identified as: (i) maize yellow stripe persistently leafhopper-transmited tenuivirus (MYStV); and (ii) barley yellow dwarf persistently aphid-transmitted luteovirus (BYDV). MYStV was identified and detected by visual examination for the external symptoms as well as insect transmission. BYDV was identified and detected by ELISA and visual examination as well. Developmental stages of MYStV-symptom types were followed up by bioassay. The severe-infection type (coarse stripe) increased gradually for 50-60 days. The mild-infection type (fine stripe) decreased gradually for 50-60 days. The bright yellow infection type was the dominant type in epidemic-diseased fields. Environmental factors, i.e., a warm winter (positive temperature deviation from normal), a high population density of insect vectors, a high percentage of viruliferous vectors and the susceptible host influenced the occurrence and the prediction of severe epidemics in Egypt.

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Barley yellow dwarf viruses	Maize/corn (Zea mays)	Egypt
	Maize yellow stripe virus	Maize/corn (Zea mays)	Egypt