“…Gavazzi & co-workers (1987) were unable to identify increases in resistance to tobacco mosaic virus (TMV), Verticilliurn wilt or Meloidogyne incognita in somaclones derived from two susceptible tomato Binarov~i et al, 1990Pickering, 1989Ireland & Lacy, 1987Wright & Lacy, 1988;Heath-Pagliuso et al, 1988;Heath-Pagliuso & Rappaport, 1990Wright & Lacy, 1988Brown et al, 1986Brettell et al, 1980Hammerschlag, 1990aHammerschlag & Ognjanov, 1990Ostry & Skilling, 1988Prakash & Thielges, 1989Matern et al, 1978Shepard et al, 1980Cassells et al, 1986, 1987Thomson et al, 1986Evans et aL, 1986Sacrist~in, 1982, 1985MacDonald & Ingram, 1985Ling et al, 1985Krishnamurthi & Tlaskal, 1974Heinz et al, 1977Krishnamurthi, 1974: Heinz et al, 1977Heinz et al, 1977Liu &Chen, 1978Liu, 1981Sreenivasan et al, 1987Daub & Jenns, 1989Barden et al, 1986Smith & Murakishi, 1987Miller et al, 1985Evans, 1987Shahin & Spivey, 1986Shahin & Spivey, 1987…”