庄内地方におけるタイヌビエ,イヌビエの発生と生育

概要

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Two Echinochloa species, E. oryzicola and E. crus-galli var. crus-galli were observed in a paddy field of the Shonai-district. The physiological and ecological properties of the two species were compared. E. oryzicola showed a longer life-span under flooded soil conditions and produced heavier seeds with shorter awn, while E. crus-galli var. crus-galli showed a higher ability of dispersion, earlier maturing, higher reproduction rate and shorter life-span. The utilization of Elmmaloce sp. for the biological control of the two species was considered to be more effective in the case of E. oryzicola than in E. crus-galli var. crus-galli, for seed germination of E. oryzicola did not occur at the same time in contrast with the other species. The stage at which the- transition from the vegetative to the reproductive phase took place differed between the two species, i. e. 9 th leaf stage for E. crus-galli var. crus-galli and 11th for E. oryzicola. Consequently since it is considered that the damage would be more severe and last longer in the latter species, it is suggested that Emmalocera sp. could be utilized for the biological control of E, oryzicola after the first spraying of herbicide.
1985-12-21