Efficacy of acetamiprid tablet against cotton aphid [Aphis gossypii] on cucumber [Cucumis sativus] by various application methods
2001
Takahashi, H. (Nippon Soda Co. Ltd., Odawara, Kanagawa (Japan)) | Murahashi, K. | Take, T. | Asai, M. | Yamada, T.
Efficacy of acetamiprid tablet against the cotton aphid on cucumber by various soil application methods was investigated compared to that of its granule applied under the same conditions. Acetami - prid tablet weighed 0.15 g including 20 mg active ingredient at 1 tablet/plant and controlled-release 2% granule at the dosage of 1 g / plant showed excellent efficacy when they were applied at the center of planting hole, similarly to the granule applied uniformly. The comparison between the efficacy in row application of tablet and soil surface application of granule suggested the efficacy of both applications became insufficient as the distance between the foot of seedling and application site became longer. Such a tendency was more remarkable with row application of the tablet than with soil surface application of granule. The tablet exhibited excellent efficacy at the dosage of 1 tablet / plant by being applied both at the foot of plant in nursery pot before transplanting to the field and at the center of the planting hole. Besides, efficacy of different sizes of tablet including same amount of acetamiprid was investigated by planting hole application. There was a tendency that tablet exhibited longer lasting activity as it became larger as far as the weight of 0.15, 0.3 and 0.6 g. With soil surface application the tendency of efficacy was reversed compared to that with planting hole application.
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