A biological implication of Bt corn is that it no longer needs to be sprayed, to the degree it was, with harmful pesticides as the insects are killed by the plant itself. This not only helps kill the core borers but is beneficial to the positive insects such as honey bees, lady beetles, green lacewing larvae, and spiders as they are no longer being sprayed with as many pesticides. By continuing spraying for the other known pests this will prevent them returning to the surrounding area and disrupting the ecosystem. The corn borer no longer killing the maize crops will increase the crop size, but it will also reduce the genetic biodiversity as the same maize will be repeatedly planted, creating a monoculture area therefore limiting the gene pool. For short periods of time this will be beneficial but if any disease or parasite enters the area all the crops will be susceptible, effecting the population as a whole due to the limited diversity. What makes the crops as a whole even more susceptible to disease and parasites is because the crop have been cloned and reproduced from a single plant. This means there is very little diversity within the gene pool and within the population, due to the genes being the same. Natural disasters such as drought could also kill the entire crop when if the maize was more genetically diverse some may survive due to a mutation. In this way the lack of genetic diversity and therefore the implications are very similar to that of selective breeding process.