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The Dutch elm disease epidemics illustrate the value of diversity in plant populations . California ranks as the second worst state in the nation in terms of the nursing shortage and has the least registered nurses per 100,000 populations in the United States , with 566 as compared to the national average of 798 . Analysis of variance ( ANOVA ) may be thought of as a generalization of hypothesis tests for differences in means from two independent samples to cases where there are more than two populations of interest . It is hoped that fly populations can be established in those areas to suppress populations of M. callizona . It is often difficult to produce Grade 1 seed of large nonoilseed sunflower because of the opposite responses of test weight and seed size to changes in plant populations . According to the report , if California significantly increased its funding for sustainable agriculture - - instead of just spending money to regulate pesticide usage - - we could aid California farmers , improve the public health and save millions of dollars in associated costs .