Herbicide susceptibility and germination characteristics of thiocarbamate herbi cide-resistant Echinochloa phyllopogon
2004
Sago, R. (Ibaraki Univ., Ami (Japan). Faculty of Agriculture) | Uchiyama, K.
Summary In 2000, three strains of Echinochloa phyllopogon were collected from farmers' fields in Biggs, California, USA. Greenhouse experiments for whole-plant bioassays were then conducted at the Ibaraki University Experimental Farm to determine levels of resistance to herbicides currently available in Japan. Although two strains of E. phyllopogon (R1, R2) exhibited resistance to treatment with the recommended field rates of molinate and thiobencarb, they were killed by pretilachlor, oxaziclomefone, pyriftalid and cafenstrol at less than the recommended field rates. The seed germination rate of the resistant strains (R1, R2) was higher than that of the susceptible strain (S) at all periods examined, and the seeds of the resistant strains (R1, R2) were less dormant than those of the susceptible strain (S). However, the temperature index of germination, mean germination rate, and leaf emergence rate of the resistant strains (R1, R2) were very similar to those of the susceptible strain (S).
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