The weed field management of after barley crop to decrease pecky rice
2017
Honda, N. | Fukuda, A. | Takaoka, S.
Two rice bug species, Stenotus rubrovittatus (Matsumura) and Trigonotylus caelestialium (Kirkaldy) (Hemiptera: Miridae), are major rice pests in Fukui Prefecture. We investigated the relation of the occurrence of two rice bug species and pecky rice damage to weedy fields after barley crop. In paddy fields adjacent to weedy field after barley crop, the number of bugs captured by sweeping on the side of a weedy field was more than that on the side of a paddy field. And these bugs were captured most within 50 meters from the ridge on the side of weedy field. The percentage of pecky rice grains of the side of a weedy field was 3.4 times as much as that of a paddy field. To examine the relationship between pecky rice damage and weeding time, we compared the percentage of pecky rice among different stage of weed management (early July, late July, early August). The percentage of pecky rice grains was affected by weeding time and its damage increased as the weed management was later. The least pecky rice damage was recognized when we weeded in early July. These results suggested that the weed management of barley crop in early July was suitable for reducing pecky rice damage.
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