| the epidemiology of wheat dwarf virus in relation to occurrence of the leafhopper psammotettix alienus in middle-germany. | occurrence of the leafhopper psammotettix alienus dahlb. and its infectivity with wheat dwarf virus (wdv) were studied in cereal crops in saxony-anhalt (middle-germany) in 2000 and 2001. the leafhoppers were collected with a sweep net and/or a cage trap and their wdv infectivity was determined by transmission to test plants. in 2000, adult leafhoppers were caught from the second week of may to the third week of december, whereas in 2001 they were trapped from the fourth week of may to the second ... | 2004 | 15036841 |