ホタルイ、イヌホタルイおよびタイワンヤマイの越冬性と越冬株から発生した植物の防除

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The present authors studied wintering abilities of Scirpus juncoides Roxb. var. hotarui Ohwi, S. juncoides Roxb. var. ohwianus T. Koyama and S. wallichii Nees under different soil moisture conditions from October, 1977 to March, 1978. And furthermore, they studied dry-resistance and emerging depths of their overwintered stumps. The effects of granular formulations of CG 102 <lbbrk> 4.4% (w/w) piperophos+1.1% (w/w) dimethametryn<rbbrk> and TH 63 <lbbrk>4.40%(w/w) piperophos+1.1% (w/w) dimethametryn+10.0% (w/w) bentazon<rbbrk> on the plants which sprouted from their overwintered stumps were also studied. 1. S. juncoides var. hotarui, S. juncoides var. ohwianus and S. wallichii overwintered regardless of soil moisture content. But their growths after transfered from out-of-door in to a greenhouse were different depending on their wintering periods, that is, the plants transfered after January 6th, 1978 sprouted more stems than the others. 2. Almost all overwintering stumps of S. juncoides var. hotarui did not sprout from deeper positions than 2cm in soil. The growth of S. juncoides var. ohwianus was reduced in proportion to the covering soil depth, but all stumps sprouted from 2cm in depth and almost all of them emerged. S. wallichii emerged even from 4cm in depth. 3. When weights of overwintering stumps of S. juncoides var. hotarui and S. fancoides var. ohwianus were reduced to less than 32% of initial weights by drying, and those of S. wallichii were reduced to less than 28%, they died regardless of drying temperature. 4. TH 63 showed excellent effects on the sprouted plants of 3 kinds of Scirpus, but the effect of CG 102 on them was poor. The effects of both herbicides on S. juncoides var. hotarui were higher than the effects on the other two kinds of Scirpus plants.
日本雑草学会の論文
1981-09-10

ホタルイ、イヌホタルイおよびタイワンヤマイの越冬性と越冬株から発生した植物の防除

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