A chemical and biological evaluation of nine MG clones shows that: 1. No significant differences were found inyield of root, but there is a strong indication that clone 9 is the best in root production. 2. Clones 1, 2, 3, and 4 were consistently better than the remaining clones with regard to quality of root based on percentage rotenone. 3. There was a significant correlation between the percentages of rotenone and rotenone plus rotenoids with biological toxicity (rotenone equivalent). The correlation between total chloroform extractives and rotenone equivalent was highly significant. 4. The average yield of rotenone for the nine clones was about one-half the yield of toxicity, as determined by bio-assay. 5. The best clones in the group, based on the amount of toxicity per plant as determined by the guppy test, were 1 and 9.

A chemical and biological evaluation of nine MG clones shows that: 1. No significant differences were found in yield of root, but there is a strong indication that clone 9 is the best in root production. 2. Clones 1, 2, 3, and 4 were consistently better than the remaining clones with regard to quality of root based on percentage rotenone. 3. There was a significant correlation between the percentages of rotenone and rotenone plus rotenoids with biological toxicity (rotenone equivalent). The correlation between total chloroform extractives and rotenone equivalent was highly significant. 4. The average yield of rotenone for the nine clones was about one-half the yield of toxicity, as determined by bio-assay. 5. The best clones in the group, based on the amount of toxicityper plant as determined by the guppy test, were 1 and 9.