Disease complex in tomato cv. 035 involving meloidogyne incognita and fusarium oxysporum f. sp. lycopersici

Abstract EN

Experiments in this investigation indicated that the tomato cv.

035 is moderately resistant to meloidogyne incognita (mi) and fusarium ox-ysporum f.

sp.

lycopersici (fol) since it supports a low population of mi nematode and retarded fusar-ial damage in single infections while the plant vigor was unaffected adequately.

this resistance was decreased as increased of inoculum levels (from 100 to 2000 ij2) of mi and (from 102 to 1010 propa-gules) of fol indicating that this resistance is main-ly density-dependent.

however, co-infection by both pathogens a lesser margin of simulative effect on root galling and wilt severity was occurred.

therefore, wounding by invading ij5 of mi proved to be unimportant for establishment of fol wilt fun-gus.

the results indicated also that, the sequence of infection by nematodes and fungus can predis-pose the host plant to attack by the other.

as with mi pre infection, nematode causes changes in host that predispose it to fungal attack leading to severe wilt expression.

likewise, pre-infection with for allowed not only more nematode penetration but also more nematode developed than in fungus.

accordingly, the present results led to the fact that, the interactions between mi nematode and fol wilt fungus are physiological rather than physical.