Effect of seedling age and seedlings per hill on snail damage in irrigated rice.
1996
Sanico A.L. | Shaobing Peng | Garcia F.V. | Laza Ma.R.C. | Visperas R.M.
Transplanted seedlings are often destroyed by snails in varying degrees. This study was conducted to test whether seedling age and/or seedlings per hill can be manipulated to reduce damage from snails. In 1995 dry season, IR72 was transplanted under snail-controlled and snail-infested lowland conditions. Four combinations of seedling age and number of seedlings per hill (2 wk-8, 3 wk-6, 4 wk-4 and 5 wk-2) were used. Single seedling was also planted for each age level. Snails were controlled in half of the plots while the other half was left infested with snails. Two-week-old seedlings were more susceptible to snail damage compared with 3-5 wk-old seedlings with a 7 percent yield difference. When snails were controlled, there was no yield difference among the treatments of seedling age and seedling number per hill at the yield level of about 8.0 t/ha. To minimize damage caused by snails, transplanting old seedlings (3-5 weeks) using high seedling number per hill should be practiced.
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