The life cycle of the soybean cyst nematode, Race 3 (SCN 3), Heterodera glycines Inchinohe was determined from observations of the developmental stages on soybean Glycine max cv. Kent root explants under gnotobiotic conditions at 25 C. Approximately 51% of the second-stage larvae penetrated the root l day after inoculation (DAI). Third-stage larvae appeared 4 DAI, became sexually differentiated...

Infection of the soybean root by the soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) induces a well-documented, yet poorly understood, response by the host plant. The plant response, involving the differentiation of a feeding structure, or "syncytium," facilitates the feeding and reproduction of the nematode to the detriment of the host. We used a genetic system involving a single do...

Soybean cyst nematode (SCN, Heterodera glycines) is a chief plant–parasitic of soybean. Application synthetic chemical nematicides poses negative side effects to human health and the environment. Therefore, search for safe effective approach more relevant. This study evaluated Genistein Daidzein on physiological index soybean nematodes, individual morphology, reversal frequency, respiration, bo...

The soybean cyst nematode (SCN), Heterodera glycines Ichinohe, has been separated into 16 races (3,5,8). Separation is based on female or cyst (referred to as cyst) formation by SCN populations on four soybean (Glycine max (L.) Merr.) genotypes-'Peking ' , 'P icket t ' , PI 88788, and PI 90763--relative to reproduction on 'Lee' (susceptible) soybean. A soybean differential has a positive reacti...

A method of selecting soybean cyst nematode (Heterodera glycines Ichinohe) on segregating soybean progeny was evaluated for developing a population capable of reproducing on PI 437654. Direct selection on PI 437654 was not possible, since no cysts developed on it. Cysts were selected for 12 nematode generations on F and F plants of Forrest x PI 437654. No cysts of the selected population were p...

The study of invertebrate-and particularly nematode-viruses is emerging with the advancement of transcriptome sequencing. Five single-stranded RNA viruses have now been confirmed within the economically important soybean cyst nematode (SCN; Heterodera glycines). From previous research, we know these viruses to be widespread in greenhouse and field populations of SCN. Several of the SCN viruses ...

The soybean cyst nematode (Heterodera glycines) has become an increasingly severe problem in soybean production areas in Brazil. The development and use of resistant cultivars is the most efficient method of minimizing losses due to this pathogen. Our objective was to test the efficiency of an alternative method for screening soybean genotypes for resistance to H. glycines in field plots. The a...

Trap crops that stimulate nematode egg hatching but not reproduction have been reported as an effective means for managing certain nematodes. Studies were carried out at two field sites each year in 1998 and 1999 to evaluate the potential of trapping the soybean cyst nematode (Heterodera glycines) with soybean and pea in the corn year to manage the nematode in Minnesota. The trap crops were pla...