Abstract
For the relevant planning of weed control in mulberry field, information on auto-ecology of Galinsoga Parviflora Cav. was investigated in the cource of growing season, with regard to alternation of generations, florescence, seed production and germination ability of seeds.
Experiments were carrid out in the Hino-mulberry field (Hino-shi) for three years from 1971.
The results were as follows;
Germination of Galinsoga was observed from late March till early November during which 3 to 4 times of alternation of generations took place.
13, 400 achenes were enumerated per plant that bore as much as 400, 000 seeds. Stem height and leaf area expanded more prosperously in summer than in spring or autumn, accordingly, growth of Galinsoga being dependent on season of germination. High temperature seemed to urge growth, florescence and maturity.
It was recognized that Galinsoga belonged to a type having light-sensitive seed.
