Journal of Weed Science and Technology

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Dry seeding rice cultivation is increasing in double-cropping paddy fields in northern Kyushu. For effective weed control, it is required to spray herbicide twice in the dry period, soil-applied herbicide after seeding, and foliar-applied herbicide before flooding. However, weed control with a single spray is required for more labor savings. In this study, the effects of the tank-mix application of soil-applied herbicides, prometryn + benthiocarb emulsifiable concentrate (PB), and trifluralin emulsifiable concentrate (T), were estimated for 3 years from 2019 to 2021. It rained moderately in 2019 and 2021, but it was extremely dry before and after sowing in 2020. A stable and highly weed control was obtained with tank-mix application of both herbicides between 3 and 10 days after sowing (DAS). It was considered that weeds that emerged in the early DAS could be controlled, so the PB herbicide controls one leaf stage Echinochloa spp., and it was enhanced by tank-mix application with the T herbicide. The control effect became higher when the tank-mix application was delayed. However, it must be applied before rice emerges. If there are few weeds, it is possible to omit the application of foliar-applied herbicides before flooding.

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