Weed Hosts of Soybean Cyst Nematode (Heterodera glycines) in Ohio¹

Abstract

In greenhouse experiments, Ohio accessions of 22 weed species representing 13 dicot families were screened as alternative hosts of soybean cyst nematode (SCN, Heterodera glycines). Purple deadnettle (Lamium purpureum), henbit (Lamium amplexicaule), field pennycress (Thlaspi arvense), shepherd's-purse (Capsella bursa-pastoris), and a susceptible soybean (Glycine max) cultivar produced SCN population densities of 510, 155, 73, 1, and 366 cysts/450 cm3 soil, respectively, 5 wk after inoculation with eggs from a race 3 SCN population. Purple deadnettle was also a strong host of race 1 SCN and a weak host of race 6 SCN. Average numbers of eggs/cyst among race 3 hosts were highest in purple deadnettle (357), followed by soybean (292), field pennycress (266), henbit (122), and shepherd's-purse (none detected). To our knowledge, henbit is the only SCN host identified here that has been previously identified as a host. The weeds identified as SCN hosts in this study have a winter annual life cycle in Ohio and may serve as sites for SCN reproduction in infested fields during the early or late growing season and when soybean plants are absent.

The biology of Canadian weeds. 9. Thlaspi arvense L. (updated)

“…T. arvense has been reported as a host for the sugar beet eel worm or cyst nematode, Heterodera schachtii Schmidt, in Saskatchewan (reviewed in Best and McIntyre 1975). In a greenhouse study, Venkatesh et al (2000) found that an Ohio population of T. arvense could serve as an alternative host of soybean cyst nematode (Heterodera glycines Ichinohe).…”

First Report of Soybean Cyst Nematode Reproduction on Purple Deadnettle under Field Conditions

“…Soybean cyst nematode (SCN, Heterodera glycines ) commonly infests soybean ( Glycine max ) fields in the United States and is a threat to profitable soybean production. In a greenhouse experiment, purple deadnettle ( Lamium purpureum ) was identified as an excellent host for SCN (4). Purple deadnettle (Fig.…”

Role of Winter Annual Weeds as Alternative Hosts for Soybean Cyst Nematode

“…5), and shepherd's‐purse [ Capsella bursa‐pastoris (L.) Medik] (Fig. 6) were shown to support SCN reproduction (52). Earlier reports had identified common chickweed [ Stellaria media (L.) Vill.]…”

“…2). Venkatesh et al (52) reported that on susceptible soybeans SCN (race 3) cyst population densities were 366 per 450 cm 3 of soil. Purple deadnettle (510 per 450 cm 3 ), henbit (155 per 450 cm 3 ), field pennycress (73 per 450 cm 3 ), and shepherd's purse (1 per 450 cm 3 ) were also reported to support SCN reproduction.…”