Strategy to reduce golden apple snail, Pomacea canaliculata (Lamarck) damage in direct-seeded rice culture
2002
dela Cruz, M.S. | Joshi, R.C. | Duca, A.V. | Tiongco, E.R. (Philippine Rice Research Inst., Maligaya, Science City of Munoz, 3119 Nueva Ecija (Philippines). Crop Protection Div.)
Direct-seeded wet sown rice culture gains popularity among farmers in the Philippines. However, golden apple snail (GAS), Pomacea canaliculata (Lamarck) damage in direct-seeded establishment is more serious than it is to transplanted rice. Golden apple snail of 10 mm size caused missing hills in transplanted rice, but the same size were more dangerous to direct-seeded rice. Draining the field after sowing pre-germinated seeds reduces GAS damage. In the Philippines, introduction of water 7-10 days after seeding (2-3 leaf stage) is a common practice, which is followed by molluscicide application to abate GAS attack. Though draining water for 2-3 weeks after seeding prevents serious GAS damage, but weeds grow along with germinating rice seeds. Thus, this study evaluated the efficacy of cyhalofop-butyl to control weeds in various time of application up to 18 days of draining. Low initial GAS damage were recorded in 15 days and 18 days draining in two separate trials, compared to early water introduction (7-10 days draining). Surprisingly zero to negligible damage increment was also observed 7-15 days after GAS release. Golden apple snail did not graze on 22 day-old seedlings. It devoured weeds when rice seedlings became hard
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