Fig1: a) Collect the Palmcrist leaf sample, wash it;b) Palmcrist leaves are cutted and dried;
c) Palmcrist leaves after drying; d) Palmcrist leaves after grinded.
Fig 2: Soak Palmcrist leaf by ethanol.
- Ratio of Palmcrist leaf material/Ethanol the most suitable for collecting Palmcrist leaf extract is 1/6, the optimal Ricinine content is 1,23mg/g.
- Efficacy against Whitefly in the laboratory showed, use the extract at a concentration of 25ml/L the highest efficiency of killing it is 60,19%.
- Efficacy against it in the field showed, use the extract at a concentration of 25ml/L the highest efficiency of killing itis 59,71% after 3 days; 51,43% after 7 days.
- To control Whitefly, depending on the density of Whiteflie in the field, spray Palmcrist leaf extract 3-4 days/time.