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J Econ Entomol

Title:		Redbanded Stink Bug (Hemiptera: Pentatomidae) Infestation and Occurrence of Delayed Maturity in Soybean
Author(s):		Vyavhare SS; Way MO; Pearson RA; Medina RF;
Address:		"Texas A&M Agrilife Research and Extension Center, 1509 Aggie Dr., Beaumont TX 77713. Department of Entomology, Texas A&M University, 2475 TAMU College Station, TX 77843. rfmedina@tamu.edu"
Journal Title:		J Econ Entomol
Year:		2015
Volume:		20150526
Issue:		4
Page Number:		1516 - 1525
DOI:		10.1093/jee/tov132
ISSN/ISBN:		0022-0493 (Print) 0022-0493 (Linking)
Abstract:		"Studies done in Brazilian soybean, Glycine max (L.) Merril, in the 1970s suggested the redbanded stink bug, Piezodorus guildinii (Westwood), is principally responsible for delayed maturity in this crop. This stink bug species has recently emerged as a serious pest of soybean in the southern United States, where little is known about its association with the occurrence of delayed maturity disorder. Also, the mechanism behind stink bug-induced soybean delayed maturity remains unknown. It is believed that stink bug feeding during pod development stages results in reduced pod-seed load, causing alteration of source-sink ratio and eventually delayed maturity. To determine the P. guildinii threshold triggering delayed maturity in soybean, experiments were conducted with varying levels of P. guildinii infestation (0, 2, 4, and 8 adults per 0.3 m) during the R4 to R5 soybean growth stages. In addition, to determine if soybean delayed maturity is exclusively because of reduced pod load, experiments with different levels of mechanical pod removal (0, 25, 50, and 75%) were conducted on field-grown soybeans. P. guildinii densities up to 4 adults per 0.3 m did not trigger occurrence of delayed maturity. However, a density of 8 adults per 0.3 m produced a significant increase in the number of green leaves retained on plants at maturity (i.e., delayed maturity). There was no effect of mechanical pod removal on green leaf retention. The lack of a significant positive correlation between mechanical pod removal and green leaf retention indicates the involvement of mechanism(s) other than reduced pod load in the occurrence of soybean delayed maturity"
Keywords:		Animals Brazil *Herbivory Heteroptera/*physiology Population Dynamics Soybeans/*growth & development Glycine max Piezodorus guildinii saliva senescence sink-source ratio;
Notes:		"MedlineVyavhare, Suhas S Way, Michael O Pearson, Rebecca A Medina, Raul F eng Research Support, Non-U.S. Gov't England 2015/10/16 J Econ Entomol. 2015 Aug; 108(4):1516-25. doi: 10.1093/jee/tov132. Epub 2015 May 26"