Analysis on effect of magnesium borate ore powder or LVYAN compounds on snail control in field trial

  Objective   To learn effect of magnesium borate ore powder and LVYAN compounds on snail control both in marshland area and in hill area, and to provide information for further field application.

  Methods   In each area 4 districts were selected.Spraying with magnesium borate ore powder 80 g/m ² and with LVYAN compounds 0.8 g/m ² was carried out respectively in two of them.The other districts were considered as control districts, one with niclosamide 2g/m ², another with no drug.

  Results   In marshland area, within 30 days the snail death rates in two trial districts ranged from 18.21% to 40.38% and from 31.65% to 36.07%, respectively significantly lower than that in niclosamide district; at the end of 30 days, no significance was seen in live snail density between in trial districts and in the control district with no drug.Immediate rainfall may influenced the molluscicide effect.In hill area, the effect in magnesium bo rate ore powder district was lower than that on niclosamide district 7 days later.However, 15 days or 30 days later, no significance was seen in the live snail density between the two districts.In the for merdistrict, live snail density was increasingly decreasing, and the snail death rate was mar kedly higher than that in the later district.The effect of LVYAN compounds was not found.

  Conclusion   T he snail control effect in hill area with magnesium borate ore powder was sat isfying, and was increasing with time.Both in marshland area and in hill area, the effect with LVYAN compounds was not of importance.