Effect Of 28-high Brassinolactone On Degradation Of Deltamethrin And Propyl Bromophos Residues In Leek

Leek is an important crop in our country.In the process of planting,it is easy to be affected by many diseases and insect pests,among which the harm of leek maggot is the most serious,which has become a major problem in Chinese leek production and caused huge economic losses.Propylophos in organophosphorus pesticides and deltamethrin in pyrethroid pesticides are commonly used in China at present.People’s improper use of pesticides may cause excessive pesticide residues,while pesticides that exceed the standard on leeks may cause damage to human system and function and harm people’s health.Brassinolide,as an efficient plant growth regulator,has high biological activity.Very low concentration can play a role in promoting roots and strengthening seedlings,preserving flowers and fruits,and at the same time can greatly increase the production of various crops,improve the quality of crops,enhance the resistance of plants,and promote the degradation of residual pesticides in plants.In order to investigate the function of 28-high brassinolide and its effect on the degradation of pesticide residues in plants.In this study,the effect of 0.01% of 28-high brassinolactone solution on the residual degradation of deltamethrin and propionate in Chinese leek was studied,and the best application of 28-high brassinolactone to Chinese leek was explored.In order to explore the effects of 28-high brassinolactone on the degradation of deltamethrin and propionate residues in leek,leek was used as test material,0.01% of28-high brassinolactone solution was used as test agent,0.01% of 24-high brassinolactone solution was used as control agent,and water was used as blank control.The leeks were treated with spray 1 d before,1 d before and 1 d after deltamethrin and propionophosphorous root irrigation,respectively.Samples were taken at 0,1,2,3,5,8,12,16 d after 20 mg/L deltamethrin and probromophos were injected into the root.The modified Qu ECh ERS method was used to pre-treat the samples of leek,and the residues of deltamethrin and probromophos in the stems and leaves of Chinese leek were detected by gas chromatography-mass spectrometry.The results showed that on day 1 after deltamethrin irrigation,the residue of deltamethrin in leek treated with 1000 times dilution 0.01% 28-high brassinolide was the lowest,which was 19.73% lower than that in water control.The residues of deltamethrin in leek after one spray of 1000 times 0.01% 28-high brassinolactone and two spray of 1000 times 0.01% 28-high brassinolactone reached the maximum on day 1 after root irrigation,which were 0.0460,0.0583 and 0.0573 mg/kg,respectively.Leeks were treated with 500,1000 and 2000 dilution of 0.01% 28-high brassinolactone,respectively.1 day after deltamethrin irrigation,the residue of deltamethrin in leeks treated with 1000 dilution of 0.01% 28-high brassinolactone was the lowest,which was significantly lower than that in water control and 2000 dilution of 0.01% 28-high brassin.There was no significant difference between treatment and treatment with 500 times dilution 0.01%28-high brassicin;After8 days of propionate irrigation,the residue of propionate in leeks treated with 500-times dilution 0.01% 28-high brassinolide was the lowest,which was 93.87% lower than that in water control.The residual amount of propionophosphorous in control chive reached the maximum of 2.1145 mg/kg 8 days after irrigation.Leeks were treated with 500,1000 and 2000 times dilution of 0.01% 28-high brassinolactone,respectively.After 8days of infusion with propionolactone,the residue of propionolactone in leeks treated with 2000 times dilution of 0.01% 28-high brassinolactone was the lowest,which was significantly lower than water control and 1000 times dilution of 0.01% 28-high brassin.There was no significant difference between treatment and 500 times dilution of 0.01%28-high brassinolide.