Assessing the temporal dynamics of Frankliniella schultzei (Thysanoptera: Thripidae) in commercial soybean crops in North Brazil

Author(s):  
Juliana L. dos Santos ◽  
Renato A. Sarmento ◽  
Poliana P. Silvestre ◽  
Luciane R. Noleto ◽  
Kayo H. B. Reis ◽  
...  

2020 ◽  
Vol 113 (6) ◽  
pp. 2997-3003
Author(s):  
Sindoval C Carvalho ◽  
Paulo A S Junior ◽  
Poliana S Pereira ◽  
Renato A Sarmento ◽  
Elizeu S Farias ◽  
...  

Abstract Frankliniella schultzei (Trybom) is a serious pest of melon crops and is commonly found in the main producing areas of melon in Brazil (North and Northeast regions). This pest causes significant losses, damaging plants through feeding and tospovirus vectoring. Thus, the proper management of F. schultzei is crucial to prevent economic losses, and knowledge of the within-field distribution patterns of F. schultzei can be used to improve this pest management. This study aimed to determine the within-field distribution (through semivariogram modeling and kriging interpolation) and the factors associated with F. schultzei abundance in open-field yellow melon crops. We surveyed four yellow melon fields located in Formoso do Araguaia (Tocantins state, North Brazil) for thrips abundance in various crop stages (vegetative, flowering, and fruiting) in 2015 and 2016. Twelve models were fitted and it was determined that F. schultzei counts were strongly aggregated. The median spatial dependence was 4.79 m (range 3.55 to 8.02 m). The surface maps generated by kriging depicted an edge effect in fields 3 and 4. In addition, correlation analyses indicated that air temperature and presence of surrounding cucurbits are positively associated with F. schultzei abundance in yellow melon fields. Altogether, these insights can be combined for spatially based pest management, especially when the conditions (cucurbits in the surroundings and warmer periods) are favorable to F. schultzei.





Author(s):  
Thomas Kleinsorge ◽  
Gerhard Rinkenauer

In two experiments, effects of incentives on task switching were investigated. Incentives were provided as a monetary bonus. In both experiments, the availability of a bonus varied on a trial-to-trial basis. The main difference between the experiments relates to the association of incentives to individual tasks. In Experiment 1, the association of incentives to individual tasks was fixed. Under these conditions, the effect of incentives was largely due to reward expectancy. Switch costs were reduced to statistical insignificance. This was true even with the task that was not associated with a bonus. In Experiment 2, there was a variable association of incentives to individual tasks. Under these conditions, the reward expectancy effect was bound to conditions with a well-established bonus-task association. In conditions in which the bonus-task association was not established in advance, enhanced performance of the bonus task was accompanied by performance decrements with the task that was not associated with a bonus. Reward expectancy affected mainly the general level of performance. The outcome of this study may also inform recently suggested neurobiological accounts about the temporal dynamics of reward processing.



2011 ◽  
Author(s):  
M. Leonard ◽  
N. Ferjan Ramirez ◽  
C. Torres ◽  
M. Hatrak ◽  
R. Mayberry ◽  
...  


2010 ◽  
Author(s):  
Matthew G. Wisniewski ◽  
Barbara A. Church ◽  
Estella H. Liu ◽  
Eduardo Mercado




2014 ◽  
Author(s):  
Joseph Adam ◽  
Selas Jennings ◽  
Thamar Bovendeerdt ◽  
Pascal Van Gerven ◽  
Petra Hurks




2013 ◽  
Author(s):  
Hanne Schevernels ◽  
Ruth Krebs ◽  
Liesbet Van der Borght ◽  
Carsten Boehler


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