A survey of Globodera rostochiensis infested field in Velingrad region (South-West Bulgaria) revealed the spread of a black egg disease in the old cysts. The fungus mycelium infected the embryos within the egg shell. The highest egg parasitization by fungi was observed during June (22.2%). The fungus destroyed the new progeny in September. Four species of nematophagous fungi were isolated from cysts and eggs: Botryotrichum piluliferum Sacc.

F₁ hybrids of Lycopersicon chilense and Lycopersicon peruvianum var. humifusum were tested for resistanse to Meloidogyne incognita (Kofoid et White, 1919) Chitw 1949 and Globodera rostochiensis (Woll, 1923) Mulvey, Stone, 1976, under glasshouse conditions. All hybrids showed resistance to M. incognita. Two hybrids were resistant to G. rostochiensis.