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The objective of this study was to obtain the fundamental information of the effective use of free-ranging Aigamo ducks in the upland fields. This study was conducted to prove the influence of adult Aigamo ducks (over 4 months of age) on weeds and pest insect infestations in the young tea fields (2 years old) from June to November in 1996 and matured tea field (5 years old) from April to October in 1997. The results were obtained as follows: In the young tea field, there was a weed of 12 plant species including 10 families, and the dominant species was Henry crabgrass (<I>Digitaria adscendens</I> (H.B.K.) Henr.) . After the late in August in 1996, the dry matter weight of weeds in the duck plot was significantly smaller than that in the control plot (no ducks) (P<0.05) . There was no significant difference in the infestation of the major pest insect, Tea green leafhopper (<I>Empoasca onukii</I> Matsuda) between control and duck plots. In the matured tea field, there was a weed of 9 plant species including 7 families, and Chickweed (<I>Stellaria media</I> (L.) Villars) and Asiatic dayflower (<I>Commelina communis</I> L.) were predominantly observed from April to June and from July to September in 1997, respectively. The dry matter weight of weeds in the duck plot was significantly smaller than that in the control plot (P<0.05) . There were no differences in the number of new leaves injured by Green plant bug (<I>Apolygus spinolai</I> (Meyer-Dür) ) among the control, conventional (pesticides) and duck plots. The infestation of Yellow tea thrips (<I>Scirtothrips dorsalis</I> Hood) showed its peak in early June, and the number of the insects in the duck plot was significantly less than that in the control plot (P<0.05) . The infestation of Tea green leafhopper in both the control and the duck plots was significantly greater than that in the conventional plot (P<0.05) just before plucking the second crop of tea. The yield of plucked new shoot in both control and duck plots was significantly lower than that of the conventional plot (P<0.05) . There were greater damages by Tea leafroller (<I>Caloptilia theivora</I> (Walsingham) ) in the duck plot, compared to control and conventional plots. No pest insects were found in the pseudo-crops, glandular stomachs and gizzards of <I>Aigamo</I> duck upon dissection, suggesting that the duck ingested little pest insects. These results indicated that free-ranging <I>Aigamo</I> ducks in the tea fields were effective in weed control, but not in pest control.
- 日本暖地畜産学会の論文
日本暖地畜産学会 | 論文
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