| Autor: |
Sansone, C. G., Minzenmayer, R. R., Mott, Dale, Knutson, Allen |
| Zdroj: |
Proceedings of the Beltwide Cotton Conferences; 2006, p1416-1421, 6p, 1 Chart, 1 Graph |
| Abstrakt: |
The cotton fleahopper, Pseudatomoscelis seriatus (Reuter), is considered a key pest in the eastern part of Texas. Both adults and nymphs feed on new growth, including small squares. Squares up to pinhead size are susceptible to damage and the plant is most susceptible during the first three weeks of fruiting. Cotton fleahopper numbers increase in wild hosts and move into cotton fields prior to squaring. In the Southern Blacklands, the population dynamics are consistent through years and vary only in numbers. As a result, cotton fleahoppers migrate continuously between wild hosts and cotton in this production region averages two insecticide applications for cotton fleahoppers, with a range of one to four applications depending on the populations. The situation changes in the western part of the state, including the Rolling Plains. In the western part of the state, the cotton fleahopper may increase to damaging populations occasionally. In the Southern Rolling Plains, wild host availability is limited by rainfall and cotton fleahopper populations usually remain at low levels. Cotton in this production region rarely averages more than one insecticide application for cotton fleahoppers. Recent research, performed with mechanical removal of squares which cannot duplicate the physiological impacts of insect feeding, has again shown that the newer cotton varieties have the ability to compensate for early square loss (including square losses in the second and third week of fruiting) if square removal ended after the third week. This study was initiated to evaluate cotton fleahopper control strategies in two different production regions in Texas in light of new research. Cotton fleahopper numbers were lower than normal in 2005. All treatment regimes numerically lowered numbers compared to the untreated control with significant differences in the Southern Blacklands six days after the second application. Differences in total squares per plant occurred with two automatic treatments having significantly higher numbers than the untreated control. No significant differences were seen in any of the parameters measured in the Southern Rolling Plains trial. Yields were not significantly different in either trial. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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