Aphid performance on diets containing sterol profiles that mimic the phloem sap of control tobacco, and modified tobacco.

One-tailed Kruskal-Wallis tests are applied because aphid performance is predicted to be higher on the control diet than modified diet: critical probability for lifespan = 0.013 after Bonferroni correction for 4 tests; critical probability for reproductive indices = 0.006 after Bonferroni correction for 8 tests. Statistically significant values of χ2 are indicated in bold. 1Composition of control tobacco phloem sap: 99% cholesterol, 1% stigmasterol [9]. 2Composition of modified tobacco phloem sap: 85% cholest-4-en-3-one, 14% cholesterol, 1.1% cholestan-3-one [9].