Abstract
Sugar beet cyst nematode (SBCN) has occurred
in Hara Village, Nagano Prefecture, Japan since 2017.
Phytosanitary measures have been taken to eradicate and
prevent the spread of this pest. Among commercially
available leaf radish green manure varieties, ‘Kobuberi
daikon’ has been used as a trap crop against SBCN.
In preliminary tests among leaf radish green manure
varieties not yet commercially available, ‘KGM1804’
(Kaneko Seeds Co., Ltd.), showed SBCN resistance. In
this study seedlings of ‘KGM1804’, ‘Kobuberi daikon’
or cabbage in plastic cups were each inoculated with 1,500
SBCN juveniles to evaluate effectiveness as trap crops.
No cysts were observed on ‘KGM1804’ or ‘Kobuberi
daikon’ at the end of the test period, whereas an average
243 cysts were produced on cabbage. Root exudates of
the two leaf radish varieties stimulated hatching of SBCN
eggs. The leaf radish varieties also had comparable
growth in fields of Hara Village. These results suggest
‘KGM1804’ and‘ Kobuberi daikon’ are equally effective
as SBCN trap crops. ‘KGM1804’ is now commercially
available as the variety ‘Shisu kurin’ in Japan.
