Resistance governed by many genes of minor effects which provide resistance (usually moderate) to any (or all) diseases or insect biotype of a given species, but can be easily affected by the environment (e.g., a variety may be susceptible in the greenhouse but may be resistant in the field or vice versa). A type of resistance expressed equally against all biotypes of a pest species. It does not involve a gene-for-gene relationship.

(syn. general resistance, race non-specific resistance) resistance which is effective against all biotypes of the pathogen (see durable resistance, specific resistance, vertical resistance)

see resistance, horizontal.