Studies On The Control Effect Of Tea Saponin Granules And Its Compound Agent Against Root-knot Nematode Disease

Root-knot nematodes currently constitute one of the most economically important groups of pathogens of agricultural crops in all the world. Losses of economic crop root-knot nematode causes reach more than 10 billion US dollar each year. Recently, root-knot nematode disease control mainly bases on chemical methods which seriously polluted the survival environment of the human race. Tea saponin is a mixture of pentacyclic triterpenoid saponins extracted from the camellia plant. Because of its good natural surface activity and biological activity, it has been widely used in pesticides fields, such as pesticide synerdists, fungicides and insecticides, etc. While studies about the use of tea saponin nematicidal activities aginst plant parasitic nematodes disease only at the preliminary study stage. Therefore, researching effective tea saponin preparation products to control parasitic nematodes disease have broad application prospects and important significance.In this paper, 60% of tea saponin was prepared as 5% or 10% tea saponin granule and three kinds of tea saponin compound agent WV1, WV3, WV5. The control effect against vegetable root-knot nematode diseases of tea saponin granules and its complex agent were evaluated through pot experiments. The residual condition of tea saponin in plants were assayed by contrast with Tea saponin content in plant sample after 35 d treatment. The results are briefly summarized as follows:Pot trial showed, 5% and 10% tea saponin granules control efficiency were below 50%. High dose of WV1 compound agent had strong effect against root-knot disease caused by Meloidogyne incognita on the plant of water spinach, the root-knot reduction rate was 92.87%. When cucumber and brassica rape were treated with high dose of WV1 compound agent against root-knot disease caused by M.incognita, the highest control efficiency were 72.19% and 78.79% respectively. When tomato treated with high dose of WV3 compound agent against root-knot disease caused by M.incognita, the highest control efficiency was 70.29%. When tomato was treated with high dose of WV5 compound agent against root-knot disease caused by Meloidogyne javanica, the root-knot reduction rate was 77.78%. Basella rubra pot trial showed, the control efficiency of WV1 and WV5 compound agent at high dose against root-knot disease caused by M.incognita were 57.84% and 60.01% respectively.Saponin content in plant sample after 35 d treatment showed that saponin content in each treatment of tomato, water spinach, basella rubra, brassica rapa were lower than blank control. This could be concluded that it had no tea saponin residue in plant aboveground when the plant of water spinach, basella rubra, tomato and brassica rapa were treated with high dose treatment of tea saponin granules and its compound agent after 35 day.