合鴨の水田放飼による雑草および防虫効果

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タイトル別名
  • Effects of Aigamo Ducks(Crossbred of Wild and Domestic Ducks) Herding on Weeding and Pest Control in the Paddy Fields.
  • アイガモ ノ スイデン ハナシガイ ニ ヨル ザッソウ オヨビ ボウチュウ コ

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The present study was carried out to examine the effects of Aigamo ducks herding on weeding and pest control in paddy rice farming. Three paddy fields were used as control (no ducks and no agrochemicals), agrochemicals (agrochemicals were used according to the standard established by Kagoshima Prefecture) and Aigamo (no agrochemicals but keeping ducks) plots. Thirty five Aigamo ducks in four weeks of age were introduced to the plot (10 a) initially and the number was adjusted to seventeen later. Aigamo ducks were kept in the plot for two months, at which the ear of rice plants have formed.<br>1. One hundred fourteen weeds with 3 species per a 120cm by 120cm square in the control plot and 18 weeds with 2 species in the Aigamo plot were found in paddy fields but no weeds found in the agrochemicals plot at one month after rice-planting.Secondly, 52 weeds with 4 species in the control plot, 15 weeds with 2 species in the agrochemicals plot and 1 weed with 1 species in Aigamo plot were found at two months after rice-planting. These results indicate that the growth of weeds was controlled better by the Aigamo ducks than the agrochemicals as time goes on.<br>2. The outbreak of plant hoppers in the Aigamo plot was controlled in the first period on July but not controlled in the second half on July. Plant hoppers in the agrochemicals plot were not found during experimental period.<br>3. The outbreak of green rice leafhoppers in the control and Aigamo plot was found but never found in the agrochemicals plot during experimental peroid.<br>4. Number of rice plants damaged by grass leaf rollers was not different between the control and Aigamo plot but remarkably decreased in the agrochemicals plot.<br>5. Number of rice plants damaged by rice-plant skippers in the Aigamo plot was fewer than that in the control plot and rice plants damaged by rice-plant skippers were not found in the agrochemicals plot.<br>6. A lot of big mud snails were found in the control and agrochemicals plot but not found in the Aigamo plot. These results indicate that the outbreak of big mud snails were controlled by Aigamo ducks.

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