Title: Dormancy of the soybean cyst nematode Heterodera glycines
Abstract: Previous research in Liaoning suggested that few juveniles hatch from cysts collected during the soybean growing and harvest seasons, and indicated that dormancy of Heterodera glycines is related to the soybean growing stage or season. In order to determine the dormancy character of H.glycines in this area, an intensive study on dormancy of H.glycines was conducted from 2002-2003. Nematodes were collected from fields and hatched in vitro under conditions designed to model the natural environment. The results showed that second stage juveniles could hatch from H.glycines white females, egg sacs and brown cysts from soil collected from the soybean rhizosphere during the growing season. This duration of hatching was long; juveniles continued to hatch from eggs at 21 days. The hatch rate of eggs in white females and egg sacs was higher than that of eggs in brown cysts. The crop type had no great effect on hatching of eggs in cysts; the eggs in cysts from fallow fields and the corn and soybean rhizosphere soils could hatch in vitro when conditions were suitable. The rate of hatch of eggs in cysts fluctuated seasonally, with the greatest rate of hatch in May 12 (host seedling stage), and the lowest in October 12 (harvest), 83.8 and 9.7 juveniles per cyst hatching within 2 weeks, respectively. Presence of an intact cyst wall significantly influenced hatching. Results suggest that a portion of H.glycines eggs exhibit dormancy under normal and adverse conditions in the Liaoning Province.
Publication Year: 2006
Publication Date: 2006-01-01
Language: en
Type: article
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Cited By Count: 1
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