Diabrotica undecimpunctata

Insecticides Vetch aphid (Megoura viciae) bollworm (Helicoverpa zea) army worm (Spodoptera littoralis) diamondback moth (Plutella xylostella) mustard beetle (Phaedon cochleariae) corn rootworm (Diabrotica undecimpunctata) whitefly Bemisia tabaci) red spider mite (Tetranychus urticae). 

The macrolide halichondramide (3)62 showed more than 75% mortality (100 ppm) against newly hatched larvae of the southern com rootworm, Diabrotica undecimpunctata howardi, and the tobacco budworm, Heliothis virescens.44 The dimeric macrolides swinholide A and... 

The blossoms of Cucurbitaceae are well known to be highly attractive to many species of Diabrotica beetles. However, the volatile compounds that act as attractants differ in different Diabrotica species. Cinnamaldehyde strongly attracts the spotted cucumber beetle, Diabrotica undecimpunctata hoivardi, whereas 4-methoxycinnamaldehyde is a specific attractant for the western corn rootworm, Diabrotica virgifera virgifera.51 The northern corn rootworm, Diabrotica barberi, and Diabrotica cristata are attracted to eugenol, cinnamyl alcohol, and 2-(4-methoxyphenyl)ethanol. Volatiles of maize, one of the host plants, also attract D. v. virgifera... 

Diabrotica undecimpunctata howardi. See Cucumber beetles Southern corn rootworms Diagnosis... 

The compounds were evaluated for insecticidal and acaricidal activity against the following species cabbage looper (Trichoplusia ni [Hubner]), Mexican bean beetle (Epilachna varivestis Muls), southern armyworm (Spodootera eridania [Cram]), pea aphid (Acvrthosiphon pisum [Harris]), twospotted spider mite (Tetranvchus urticae [Koch]) and southern corn rootworm (Diabrotica undecimpunctata Howardi). 

Toxicity of the compounds was examined in four types of insects house fly (Musca domestica), mosquito (Aedes aegypti), corn rootworm beetles (Diabrotica virgifera virgifera and Diabrotica undecimpunctata howardi) and the German cockroach (Blattella... 

Chirida bipunctata fabricius Diabrotica undecimpunctata howardi Barber Diacrysia" obHqua walker Dicladispa armigera 01 iv. 

Activity A. is an attractant (see semiochemicals) for the com root pests Diabrotica undecimpunctata and D. virgifera widely distributed in South and West USA. Biosynthesis ftom L-phenylalanine ( )-p-cou-marie acid. 

Activity E. and chavicol are attractants for the beetles Diabrotica undecimpunctata and D. virgifera occurring in the South and West USA where they attack corn roots. 

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. 

Figure 9. The difference in the topical pLDso and the soil pLCso plotted with calculated logP and calculated log volatility on 3 instar southern com rootworm larva (Diabrotica undecimpunctata howardi)...

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). 

Triterpenes Cucurbitacins (D 6.4) Feeding attractant for Diabrotica undecimpunctata (beetle)... 

LAW 12] Lawrence S.D., Nov.ak N.G., Kayal W.E. et al., Root herbivory molecular analysis of the maize transcriptome upon infestation by southern com rootworm, Diabrotica undecimpunctata howardC, Physiologia Plantarum, vol. 144, pp. 303-319, 2012. 

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