Diabrotica undecimpunctata howardii

A number of studies have examined the role of various factors such as volatility and solubility on the efficacy of soil insecticides.(14) While the soil itself affects the efficacy of soil insecticides, the major determinate of biological activity is the amount of organic material in the soil.(15) Simmons, Lew, Silverman and Ali studied the effect of pyrethroids and some commercial insecticides on 3 instar southern com rootworm larva (Diabrotica undecimpunctata howardii).(16) They found that a combination of calculated lipophilicity and calculated volatility could predict soil pLCso based on the topical pLDso. The volatility was expressed as the log of the vapor pressure in nun Hg. We re-plotted the difference of the topical pLDso - soil pLCso with the calculated logP and calculated log volatility in a 3D graph shown in Figure 9. It can be seen as the compounds become more volatile (logVp < 5) that is a marked increase in soil toxicity. As the compounds become less lipophilic (more hydrophilic), they also become more toxic in the soil. 

Southern com rootworm Diabrotica undecimpunctata howardii) adults are attracted late in the season to many aromatic compounds phenylacetaldehyde, benzyl acetone, phenethyl alcohol, phenyl acetate, indole, veratrole (33), methyleugenol (31), methylisoeugenol (32), eugenol (18), and isoeugenol. Only veratrole (33), phenylacetaldehyde,... 

Lampman, R. L., R. L. Metcalf, and J. F. Andersen, Semiochemi-cal attractants of Diabrotica undecimpunctata howardii Barber, southern com rootworm, and Diabrotica virgifera virgifera Leconte, the western com rootworm (Coleoptera Chrysomelidae), J. Chem. Ecol., 13, 959-975 (1987). 

---

See also in sourсe #XX -- [ , ]

---