There is evidence to support a trend of accelerating erosion of the genetic resources of agricultural plants and animals.[13] An increase in genetic similarity of agricultural plants and animals means an increased risk of food loss from major epidemics. Wild species of agricultural plants have been found to be more resistant to disease, for example the wild corn species Teosinte is resistant to 4 corn diseases that affect human grown crops.[14] A combination of seed banking and habitat conservation has been proposed to maintain plant diversity for food security purposes.[15]