ABSTRACT Aphids, which feed solely on plant phloem sap, have developed symbiotic associations with bacteria that provide them with the amino acids that are lacking in phloem. Three soybean aphid (Aphis glycines Mat samura) populations were screened for the presence of Buchnera aphidicola and three common species of secondary aphid symbionts (Serratia symbiotica, Hamiltonella defensa, and Regiella insecticola). Diagnostic polymerase chain reaction and subsequent DNA sequencing showed the presence of two species of symbiotic bacteria present in all three soybean aphid populations tested: B.
Soybean rust, caused by Phakopsora pachyrhizi, is an important disease in Nigeria and many other soybean-producing countries worldwide.To determine the geographical distribution of soybean rust in Nigeria, soybean fields were surveyed in the Derived Savanna (DS), Northern Guinea Savanna (NGS), and Southern Guinea Savanna (SGS) agroecological zones in Nigeria between 2004 and 2006. Disease severity in each zone was determined and analyzed using geostatistics.
Soybean rust, caused by Phakopsora pachyrhizi, is a devastating foliar disease of soybean that may cause significant yield losses if not managed by well-timed fungicide applications. To determine the effect of fungicide timing on soybean rust severity and soybean yield, field trials were completed in Paraguay (four locations), the United States (two locations), and Zimbabwe (one location) from 2005 to 2006.
Fusarium virguliforme (Akoi, Oӄonnell, Homma & Lattanzi), formerly named F. solani (Mart.) Sacc. f.sp. glycines, is the cause of soybean sudden death syndrome (SDS). Over the last 6 years, an international collection of F. virguliforme isolates has been established and maintained at the National Soybean Pathogen Collection Center, University of Illinois at Urbana-Champaign.
Soyfood recipes are increasingly utilized in American homes, in large part because soy is such an excellent complement to so many recipe ingredients. With funding assistance from the soybean checkoff, ISA is working to raise consumer awareness of this nutritional option, which can be used for everything from creating lower fat desserts by substituting soymilk for evaporated milk, to blending soft tofu in dressings and sauces, to thickening gravies with soy flour, to baking foods with soybean oil to retain moisture and freshness longer.
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The soybean aphid (Aphis glycines Matsumura) is a major soybean [Glycine max (L.) Merr.] insect pest. Soybean plant introduction (PI) 200538 has strong resistance to the aphid. The objectives of our research were to determine the inheritance of resistance and to map gene(s) controlling resistance in PI 200538.
White mold, caused by Sclerotinia sclerotiorum (Lib.) de Bary, can be a serious disease of crops grown under cool, moist environments. In many plants, such as soybean [Glycine max (L.) Merr.], complete genetic resistance does not exist.