Spider (Araneae) predations on white-backed planthopper Sogatella furcifera in subtropical rice ecosystems, China.
BACKGROUND
Spiders are effective biological control agents in rice ecosystems, but the comparative study of predations among main spider species under field conditions has not been fully explored owing to a lack of practical methodology. In this study, more than 6000 spiders of dominant species were collected from subtropical rice ecosystems to compare their predations on Sogatella furcifera (Horváth) (white-backed planthopper, WBPH) using DNA-based gut content analysis.


RESULTS
The positive rates for all spider taxa were closely related to prey densities, as well as their behaviors and niches. The relationships of positive rates to prey planthopper densities for Pardosa pseudoannulata (Böes. et Str.), Coleosoma octomaculata (Böes. et Str.), Tetragnatha maxillosa Thorell and Ummeliata insecticeps (Böes. et Str.) under field conditions could be described using saturated response curves. Quantitative comparisons of predations among the four spider species confirmed that P. pseudoannulata and C. octomaculata were more rapacious than U. insecticeps and T. maxillosa under field conditions. A comparison of ratio of spiders to WBPH and positive rates between fields revealed that biological control by spiders could be effectively integrated with variety resistance.


CONCLUSION
Generalist spiders could follow up WBPH population timely, and assemblages of spiders coupled with variety resistance could effectively suppress WBPH population. © 2016 Society of Chemical Industry.
['Wang|Xue-Qin|XQ|', 'Wang|Guang-Hua|GH|', 'Zhu|Zeng-Rong|ZR|', 'Tang|Qi-Yi|QY|', 'Hu|Yang|Y|', 'Qiao|Fei|F|', 'Heong|Kong Luen|KL|', 'Cheng|Jia-An|JA|']
D000818:Animals D061046:Biological Control Agents D002681:China D017753:Ecosystem D006430:Hemiptera D012275:Oryza D011235:Predatory Behavior D060888:Real-Time Polymerase Chain Reaction D017422:Sequence Analysis, DNA D013112:Spiders
Sogatella furcifera biological control DNA-based gut content analysis Pardosa pseudoannulata Coleosoma octomaculata saturated response curve