ウリカワの生態と防除 : 主として生長と増殖

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Sagittaria pygmaea Miq., a perennial aquatic weed that is difficult to eliminate perfectly with application of herbicides already recommended for rice in Japan, has invaded widely in Southwestern regions of Japan and now poses a serious problem of weed control in lowland fields there. Accordingly, a study on ecology and control of this weed was inaugurated in 1969. Some of the results obtained from the experiments of 1969, 1970, and 1971 were here presented. 1. Taking into consideration with reference to developmental changes of underground parts and increasing aspects of plant number, the life span of Sagittaria pygmaea seems to be composed of four sequent periods of "Initial Emergence", "Stolon Multiplication", "Tuber Formation" and "Tuber Completion". 2. The depth of emergence of Sagittaria pygmaea in the soil is not so deep as perennial Cyperaceaes. It was found in the 1970's experiment that 80 per cent of plants investigated was emergeable within 3. 4cm deep and that of tubers wintering in the soil distributed by about 3. 0cm beneath the soil surface. 3. The new stolon in an emerged plant differentiates from the base of shoot in the soil at the nearly same time as that of extending the first leaf. Prior to that, however, the rooting occurs when whole plant is still in the soil and is acropetally elongating. 4. The number of plants lasts to increase rapidly until around early or middle September, showing a seasonal change of Low-High-Low at the rate of increase. One plant come up above the soil surface around late May, for example, multiplies in number of approximate 250. 5. Since the tubers of Sagittaria pygmaea, when they are apart from the mother plant, can easily germinate and further make rooting under a submerged condition with temperatures of 20 to 30℃, it appears that they have no appreciable dormancy.
日本雑草学会の論文
1972-09-30

ウリカワの生態と防除 : 主として生長と増殖

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