2Cohen Y, Rubin A E, Vaknin M. 2011. Post infection application of DL-3-amino-butyrie acid ( BABA ) induces multiple forms of resistance against Bremia lactucae in lettuce. Eur J Plant Pathol 130:13-27.
3Garibaldi A, Gilardi G, Cogliati E E, Gullino M L.2012.Silicon and increased electrical conductivity reduce downy mildew of soilless grown lettuce . Eur J Plant Pathol, 132:123-132.
4Logsdon C E, Strobel G. 1960. Additional records of vegetable dis- eases in Alaska. PI DisReporter ,44: 92-93.
5Michelmore R , Wong J .2008. Classical and molecular genetics of Bremia lactucae, cause of lettuce downy mildew. Eur J Plant Pathol, 122:19-30.
6Sedl~irov~i M, Petrivalsky M, Piterkov~i J, Luhov~i L, Kocirov~ J, Lebeda A. 2011. Influence of nitric oxide and reactive oxygen species on development of lettuce downy mildew in Lactuca spp.. Eur J Plant Pathol, 129:267-280.
7Tai F L. 1979. Sylloge Fungorum Sinicorum. Sci Press Acad Sin Pe- king, 1527: 80-97.
8Wolcan S M.2010.First report of downy mildew caused by Bremia lactucae on Gerbera jamensonii in Argentina.Australasian Plant Disease Notes, 5 : 98-100.