التفاصيل البيبلوغرافية
| العنوان: |
Efficacy of quinoa (Chenopodium quinoa) saponins against golden apple snail (Pomacea canaliculata) in the Philippines under laboratory conditions. |
| المؤلفون: |
Joshi, Ravindra C., San Martín, Ricardo, Saez-Navarrete, Cesar, Alarcon, John, Sainz, Javier, Antolin, Mina M., Martin, Antonio R., Sebastian, Leocadio S. |
| المصدر: |
Crop Protection (02612194); Mar2008, Vol. 27 Issue 3-5, p553-557, 5p |
| مصطلحات موضوعية: |
CONTROL of plant parasites, QUINOA, SAPONINS |
| مصطلحات جغرافية: |
PHILIPPINES |
| مستخلص: |
Abstract: A novel product for managing Pomacea canaliculata, golden apple snail (GAS), containing quinoa saponins (Chenopodium quinoa), was evaluated under laboratory conditions for the protection of newly sprouted rice seeds. Experimental methods mimicked conditions found in direct-seeded rice cultivation in the Philippines, but with a very high GAS density (90snails/m2). Protection of newly sprouted seeds was directly proportional to saponin concentration in rice water. At 9 and 11ppm saponin, seedling protection after 48h against GAS of different sizes was 93% and 95%, respectively. Seedling recovery after 5d with 11ppm saponin was 93%. This value declined to 0% and 4%, for the control (untreated) and niclosamide, a synthetic chemical molluscicide, respectively. The results indicated that although niclosamide provides high efficacy against GAS (100% mortality, 24h), it has a serious detrimental effect on rice seedlings. Mean GAS mortality with 11ppm saponin was low at 24h (45%), but increased to 94% at 48h. Thus, seedling protection was probably due to an almost immediate closure of the snail''s opercula when exposed to saponin solutions, followed by significant death rates within 24 and 48h. The product also exhibits ovicidal effects, particularly with 1–5d old egg masses; older egg masses were less susceptible to the product. The use of 11ppm saponin slightly affected shoot growth, but this effect disappeared with time and the plants attained normal development. Saponin application rates at 10ppm saponin in the rice water correspond to ca. 6kg product/ha under cultivation conditions used in the Philippines. These results suggest that quinoa saponins may represent a commercially feasible environmentally benign alternative to synthetic chemical molluscicides against GAS, particularly in direct-seeded rice culture. [Copyright &y& Elsevier] |
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| قاعدة البيانات: |
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