Autumn, Spring, winter
* Resistant varieties may exhibit some disease symptoms or damage under heavy pest pressure and/or under adverse environmental conditions and/or in the face of new biotypes, pathotypes, races or strains of the pest that may emerge.
For tomatoes: Soil temperature above 27°C and other stresses may cause nematode resistance to break.
**please refer to the ISF definitions at http://www.worldseed.org/wp-content/uploads/2017/05/Definition_on_reaction_plants_to_pests_2017_final.pdf
A copy of the definitions for terms describing reactions of plants to pests for the Vegetable Seed Industry, can be obtained at our offices upon demand.