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用８种方法保藏１８个Ｂｔ菌株５～２３年，结果表明，不同保藏方法对Ｂｔ菌株的存活率和毒效存在不同程度的影响。这些菌株平均存活率为２９．３％～８０．３％。除保藏５年的ＭＰ┐３４２外，较高者有７９００７（１８年）５７．５％，８２６１２（１５年）５６．９％；最低为０１６（２２年）２９．３％。不同保藏方法平均存活率排序：土壤保藏Ａ（５５．５％）＞沙管保藏Ａ（５３．０％）＞虫尸保藏Ａ（４７．５％）＞土壤保藏Ｂ（４３．５％）＞沙管保藏Ｂ（３８．７％）＞虫尸保藏Ｂ（３６．６％）＞石蜡保藏（３１．６％）＞滤纸保藏（３０．１％）。沙管、土壤和虫尸３种方法适用于Ｂｔ的菌种保藏
Eight strains of 18 Bt strains were preserved for 5-23 years. The results showed that the survival rates and the toxicological effects of different strains of Bt strains were different. The average survival rate of these strains was 29.3% ~ 80.3%. Except for the MP┐342, which has been preserved for 5 years, the highest ones are 79,007 (18 years), 57.5% and 82,612 (15 years), with 56.9% and the lowest is 016 (22 years), 29.3%. The average survival rate of different preservation methods was as follows: soil preservation A (55.5%)> sand tube A (53.0%)> pest preservation A (47.5%)> soil preservation B (43.5%)> Sand tube deposit B (38.7%)> worm deposits B (36.6%)> paraffin deposits (31.6%)> filter paper deposits (30.1%). Sand tube, soil and pest corpse 3 kinds of methods are suitable for the preservation of Bt species