長崎県における畑麦作の雑草に関する研究 : II.フラサバソウの生態と防除法

概要

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(1) Some ecological characteristics and chemical control of ivy-leaved speedwell, which was one of the most harmful weeds in wheat and barley fields in Nagasaki Prefecture, were investigated. (2) The seeds stored in soil from June had awaked from dormancy by October. (3) After sowing wheat in November the seedlings emerged rapidly and simultaneously under mild soil temperature condition, but slowly and took about 3 months up to 90 percent emergence under severe temperature condition. There was little difference between the emergence curves of this weeds and of cleaver seedlings. (4) Ivy-leaved speedwell is a winter annual weed in southern part of Japan. It flowered from February to April, dropped the fruits after the end of April and died in the end of May. (5) The seedlings emerged from deep soil layer like cleaver, and the depth was 25 mm. on the average and 60 mm. in maximum. (6) From reason of these characteristics, the effect of soil treatment herbicide such as CIPC was incomplete. Foliage treatments of ioxynil and PCP in growing period of the crop were very effective.
日本雑草学会の論文
1971-10-20