Meta analysis of the effects of Bacillus thuringiensis on different insects
Objective A meta-analysis of the effects of Bacillus thuringiensis on different insects.Methods Four domestic and foreign databases,including NIH database,PubMed database,China National Knowledge Infrastructure(CNKI),and Wanfang database,were searched by computer to search for literature on the insecticidal effect of Bacillus thuringiensis.The search period was from January 1980 to June 2022,and data was independently extracted by three researchers for quality evaluation.Meta analysis was conducted using Stata 16.0 software.Results A total of 25 papers meeting the criteria were included,including 20 Chinese studies and 5 English studies.The meta-analysis results:(1)Firstly,the data with 95％ confidence intervals and WMD were selected for heterogeneity analysis,Hemiptera(95％ CI:1.83-3.38,Z=6.59,P＜0.01,I2=30.98％ ),grass-craving nightshade moths(95％ CI:1.40-2.08,Z=11.62,P＜0.01,I2=0.00％ ),mosquitoes(95％ CI:0.50-2.20,Z=3.11,P＜0.01),with small statistical heterogeneity among the three(P＜50％ ),and the results of their combined effects were more reliable,and the difference of combined effects was statistically significant.Cotton bollworms(95％ CI:1.03-1.60,Z=9.07,P＜0.01,P=96.82％ ),beet noctuid moths(95％ CI:2.58-6.87,Z=4.32,P＜0.01,P=93,49％ ),and diamondback moth(95％ CI:1.61-2.73,Z=7.60,P＜0.01,P=97.15％ ),the statistical heterogeneity among three was significant(I2＞50％ ),and the difference in the combined effect was statistically significant after using the random effects model.(2)The number of insect deaths was selected as an outcome indicator,using a blank control analysis,cotton bollworms(95％ CI:4.72-7.30,Z=9.15,P＜0.01,P=39.22％ ),diamondback moth(95％ CI:5.19-6.92,Z=13.78,P＜0.01,P=46.26％ ),mosquitoes(95％ CI:3.79-5.03,Z=13.95,P=0.00,I2=25.83％ ),the statistical heterogeneity among the three was small(P＜50％ ),and the fixed-effects model analysis results showed statistically significant differences.Conclusion Bacillus thuringiensis has varying degrees of killing effects on insects of Lepidoptera,Diptera,and Hemiptera.The research results showed that its killing effects on cotton bollworms and diamondback moth are particularly prominent and have research value.
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