Infestation by Bemisia tabaci (Hemiptera: Aleyrodidae) and incidence of whitefly-transmitted viruses after the application of four biorational insecticides in some crops in Egypt
Bemisia tabaci (Gennadius) is a global insect pest that transmits many important plant viruses. A field study was conducted on infestation by B. tabaci and incidence of whitefly-transmitted viruses after the application of selected foliar and seed-treated biorational insecticides in seven vegetable and row crops in Egypt. Three foliar insecticides (Actara, Biofly and Neemix) and a treated check (Actellic) were assayed across three weeks on seedlings and mature plants, and two seed-treated insecticides (Actara and Gaucho) and a treated check (Aldicarb) were assayed on seedlings. All of the foliar insecticides led to 60–100% reductions in whitefly infestations in each crop. Biofly and Neemix were the least efficacious insecticides. Incidences of whitefly-transmitted viruses were reduced in each insecticide-treated plot with seedlings of four crops; however, no effect on virus incidence was observed in the experiment with mature plants. Crops of cucumber, eggplant, squash and tomato displayed symptoms characteristic of Cucumber vein yellowing virus, Squash leaf curl virus or Tomato yellow leaf curl virus; however, no symptoms of whitefly-transmitted viruses were observed in green bean, potato or sugar beet. The results show that several biorational insecticides may suppress whitefly populations in seedlings to delay whitefly-transmitted viruses in some vegetable crops in Egypt.
Key wordsbiopesticide crop protection insecticide integrated pest management sweetpotato whitefly vegetable virus infection
Unable to display preview. Download preview PDF.
- Abd-Rabou S. (1999) New records on whiteflies in Egypt. Journal of Agricultural Research 77, 1143–1146.Google Scholar
- Dinsdale A., Cook L., Riginos C., Buckley Y. M. and De Barro P. (2010) Refined global analysis of Bemisia tabaci (Hemiptera: Sternorrhyncha: Aleyrodoidea: Aleyrodidae) mitochondrial cytochrome oxidase 1 to identify species level genetic boundaries. Annals of the Entomological Society of America 103, 196–208.CrossRefGoogle Scholar
- Farag A. G., Amer M. A., Amin H. A. and Mayzad H. M. (2005) Detection of bipartite geminiviruses causing Squash leaf curl disease in Egypt using polymerase chain reaction and nucleotide sequence. Egyptian Journal of Virology 2, 239–354.Google Scholar
- Mazyad H. M., Omar E., Al-Taher K. and Salha M. (1979) Observations on the epidemiology of tomato yellow leaf curl disease on tomato plants. Plant Disease Reporter 63, 695–698.Google Scholar
- SAS Institute (2010) SAS/STAT version 9.3. SAS Institute, Cary, NC.Google Scholar