N.I. Vavilov’s theory on natural immunity of plants toharmful organisms and breeding of cereal crops foraphid resistance

The data on mechanisms of cereal crops active and passive resistance to cereal aphids are presented. The specificity of interaction between the insects and host plants is discussed. The prospects for broadening of cereal genetic diversity for aphid resistance are considered. It is shown that adaptation process of harmful organisms can be slow down by means of rational territorial distribution of donors with different resistance genes in population areas of insect. The results of studies on cereal crops genetic resources for aphid resistance completely confirm the laws on natural immunity of plants to harmful organisms which were stated by N.I. Vavilov.