Maize veliow stripe virus (MYSV), associated with tenuivirus-like filaments, is transmitted in a persistent manner by the leafhoppcr Cicadulina chinai. In this vector, MYSV acquisition and inoculation threshold times were 30 min each, latent period ranged from 4.5 to 8 days depending on temperature (14-25 °C), and retention periods were as long as 27 days. Up to 26 % of C. chinat collected from maize fields in Ciza, Egypt, during September and October 1985 were naturally infective with MYSV. Two symptom-types (fine and coarse stripe) appeared on experimentally infected plants, usually on separate leaves of the same plant. However, these two symptom-types could not be isolated on separate plants through transmission by single C. chinai leafhoppers. MYSV was transmitted by nymphs and adults of C chinai from maize to maize, wheat and barley, and from wheat to maize plants. Up to 6 % of the wheat plants examined in Naga Hamadi (Southern Egypt) in February 1986, were naturally infected. It is suggested that wheat, barley and possibly graminaceous weeds mav serve as winter hosts or reservoirs for MYSV and its leafhopper vector in Egypt.
ZusammenfassungVektor-und Wirt/Pflanze-Beziehungen des durch Zikaden ubertragenen Maize yeliow stripe virus Maize yellow stripe virus (MYSV), das mit Tenuivirus-ahnlichen Faden verkntipft ist, wird durch Cicadulina chinai persistent iibertragen. In diesem Vektor wurden MYSV-Acquisitions-und Inokulationszeiten von jeweils 30 Minuten ermittelt, die Latenzperiode lag zwischen 4,5 und 8 Tagen in Ahhangigkeit von der Temperatur (14-25 °C), und Retentionsperioden von bis zu 27 Tagen '' Correspondence and reprints U.S. Cppynghr Cle.r,ac. Cen.cr Cod. Spacemen,: 093 1-1 785/89/2603-0246$02.50/0
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