[ Objective ] The paper was to solve the weakness of heavy postharvest diseases and non-endurable storage of ＇ Shatangju＇, to improve the preservation effect of ＇ Shatangju＇. [ Method ] Fruits were dipped in diffe...[ Objective ] The paper was to solve the weakness of heavy postharvest diseases and non-endurable storage of ＇ Shatangju＇, to improve the preservation effect of ＇ Shatangju＇. [ Method ] Fruits were dipped in different concentrations of procbloraz-manganesc chloride complex solutions. The postharvest weight loss rate, soluble solids content and decay rate of fruits were determined, and the safety of chemical agents was observed and evaluated. [ Result ] Prochloraz-manganese chloride complex had significant preservation effect on postharvest ＇ Shatangju＇ fruits, and the appropriate concentration was 0.15% -0.20% （effective content） ; the decay rates of fruits stored at room temperature for 15, 30, 45, 60 and 90 d were 0, 5%, 〈 10%, 〈 10% and 〈 30% ; there was no specific changes in smell and flavor of non-decayed fruits. [ Conclusion ] Prochloraz-manganese chloride complex solution had significant preservation effect on ＇ Shatangju＇ by inhibiting and reducing the growth and development of pathogenic bacteria, and the effect was much better under refrigeration condition.展开更多
‘Gonggan’( Citrus reticulata) is a famous,high-quality and special citrus cultivar in the Xijiang River valley,Guangdong Province. However,it easily suffers from postharvest diseases,and thus is not tolerant to stor...‘Gonggan’( Citrus reticulata) is a famous,high-quality and special citrus cultivar in the Xijiang River valley,Guangdong Province. However,it easily suffers from postharvest diseases,and thus is not tolerant to storage. Based on the preliminary test results,prochloraz-manganese chloride complex was selected as the disinfectant,and prepared into different concentrations for carrying out preservation test by dipping fruits. The fruit weight loss,soluble solids content and decay rate were analyzed,and the application security and sensory evaluation for fruit freshness and flavor were observed. The results showed that dipping fruits with prochloraz-manganese chloride complex solution had significant preservation effect on‘Gonggan’fruits in postharvest storage; the suitable concentration was 2. 0-3. 0 g/L,and the decay rates of fruits stored at room temperature for 30,60 and 90 d were below 5%,10% and 15%,respectively. Plate inoculation test further revealed that the pathogen of‘Gonggan’was sensitive to prochloraz-manganese chloride complex,and the concentration of 1. 0 g/L was enough to produce significant antimicrobial effect. Other technical links related to postharvest preservation of‘Gonggan’with prochloraz-manganese chloride complex were discussed.展开更多
[Objectives] This study was conducted to evaluate the toxicity risk of prochloraz-manganese chloride complex to environmental organisms. [Methods] The acute toxicity tests of prochloraz-manganese chloride complex on 8...[Objectives] This study was conducted to evaluate the toxicity risk of prochloraz-manganese chloride complex to environmental organisms. [Methods] The acute toxicity tests of prochloraz-manganese chloride complex on 8 common environmental organisms, such as Coturnix coturnix japonica, Apis mellifera L., Eisenia foetida, Bombyx mori, Trichogramma japonicum, Brachydanio rerio, Daphnia magna Straus and Scenedesmus obliquus were carried out. [Results] Prochloraz-manganese chloride complex to D. magna EC50(48 h): 1.11 mg a.i./L, with a 95% confidence limit of 1.00-1.26 mg a.i./L;B. rerio LC50(96 h): 2.84 mg a.i./L, with a 95 % Confidence limit of 2.43-3.48 mg a.i./L;S. obliquus ErC50(72 h): 1.88×10^-2 mg a.i./L, with a 95% confidence limit of 1.70×10^-2-2.16×10^-2 mg a.i./L;C. coturnix LD50(168 h): 1.01×10^3 mg a.i./kg body weight, with a 95% confidence limit of 7.87×10^2-1.27×10^3 mg a.i./kg body weight;T. japonicum LR50(24 h): 2.53×10^-3 mg a.i./cm^2, with a 95% confidence limit of 2.14×10^-3-2.99×10^-3 mg a.i./cm^2;B. mori LC50(96 h): 2.03×10^2 mg a.i./L, with a 95% confidence limit of 1.79×10^2-2.30×10^2 mg a.i./L;A. mellifera(peroral) LD50(48 h)>100 μg a.i./bee;A. mellifera(contact) LD50(48 h)>100 μg a.i./bee;E. foetida LC50(14 d)>1.00×10^2 mg a.i./kg dry soil. According to the Guidance for Evaluating and Calculating Degradation Kinetics in Environmental Media for Pesticide Registration, prochloraz-manganese chloride complex had low toxicity to A. mellifera, C. coturnix, B. mori and E. foetida, medium toxicity to D. magna and B. rerio, and high toxicity and low risk to S. obliquus and T. japonicum. [Conclusions] This study provides a data basis for the toxicity and environmental safety evaluation of the agent.展开更多
基金Supported by Science and Technology Project of Guangdong Province(2014A020208143)Natural Science Foundation of Guangdong Province(S2013010015195)+1 种基金Science and Technology Innovation Project of Guangdong Department of Education(2013KJCX0192)Special Fund for Introduced Talents in Colleges and Universities in Guangdong Province(2010)
文摘[ Objective ] The paper was to solve the weakness of heavy postharvest diseases and non-endurable storage of ＇ Shatangju＇, to improve the preservation effect of ＇ Shatangju＇. [ Method ] Fruits were dipped in different concentrations of procbloraz-manganesc chloride complex solutions. The postharvest weight loss rate, soluble solids content and decay rate of fruits were determined, and the safety of chemical agents was observed and evaluated. [ Result ] Prochloraz-manganese chloride complex had significant preservation effect on postharvest ＇ Shatangju＇ fruits, and the appropriate concentration was 0.15% -0.20% （effective content） ; the decay rates of fruits stored at room temperature for 15, 30, 45, 60 and 90 d were 0, 5%, 〈 10%, 〈 10% and 〈 30% ; there was no specific changes in smell and flavor of non-decayed fruits. [ Conclusion ] Prochloraz-manganese chloride complex solution had significant preservation effect on ＇ Shatangju＇ by inhibiting and reducing the growth and development of pathogenic bacteria, and the effect was much better under refrigeration condition.
基金Supported by Science and Technology Project of Guangdong Province(2014A020208143)Natural Science Foundation of Guangdong Province(S2013010015195)+1 种基金Science and Technology Innovation Project of Guangdong Department of Education(2013KJCX0192)Special Fund for the Introduction of Talents in Colleges and Universities of Guangdong Province(2010)
文摘‘Gonggan’( Citrus reticulata) is a famous,high-quality and special citrus cultivar in the Xijiang River valley,Guangdong Province. However,it easily suffers from postharvest diseases,and thus is not tolerant to storage. Based on the preliminary test results,prochloraz-manganese chloride complex was selected as the disinfectant,and prepared into different concentrations for carrying out preservation test by dipping fruits. The fruit weight loss,soluble solids content and decay rate were analyzed,and the application security and sensory evaluation for fruit freshness and flavor were observed. The results showed that dipping fruits with prochloraz-manganese chloride complex solution had significant preservation effect on‘Gonggan’fruits in postharvest storage; the suitable concentration was 2. 0-3. 0 g/L,and the decay rates of fruits stored at room temperature for 30,60 and 90 d were below 5%,10% and 15%,respectively. Plate inoculation test further revealed that the pathogen of‘Gonggan’was sensitive to prochloraz-manganese chloride complex,and the concentration of 1. 0 g/L was enough to produce significant antimicrobial effect. Other technical links related to postharvest preservation of‘Gonggan’with prochloraz-manganese chloride complex were discussed.
基金Supported by Hunan Scientific and Technological Innovation Planning Project(2019NK4170)Fund for Hunan Province Double First-Class Applied Discipline Plant Protection。
文摘[Objectives] This study was conducted to evaluate the toxicity risk of prochloraz-manganese chloride complex to environmental organisms. [Methods] The acute toxicity tests of prochloraz-manganese chloride complex on 8 common environmental organisms, such as Coturnix coturnix japonica, Apis mellifera L., Eisenia foetida, Bombyx mori, Trichogramma japonicum, Brachydanio rerio, Daphnia magna Straus and Scenedesmus obliquus were carried out. [Results] Prochloraz-manganese chloride complex to D. magna EC50(48 h): 1.11 mg a.i./L, with a 95% confidence limit of 1.00-1.26 mg a.i./L;B. rerio LC50(96 h): 2.84 mg a.i./L, with a 95 % Confidence limit of 2.43-3.48 mg a.i./L;S. obliquus ErC50(72 h): 1.88×10^-2 mg a.i./L, with a 95% confidence limit of 1.70×10^-2-2.16×10^-2 mg a.i./L;C. coturnix LD50(168 h): 1.01×10^3 mg a.i./kg body weight, with a 95% confidence limit of 7.87×10^2-1.27×10^3 mg a.i./kg body weight;T. japonicum LR50(24 h): 2.53×10^-3 mg a.i./cm^2, with a 95% confidence limit of 2.14×10^-3-2.99×10^-3 mg a.i./cm^2;B. mori LC50(96 h): 2.03×10^2 mg a.i./L, with a 95% confidence limit of 1.79×10^2-2.30×10^2 mg a.i./L;A. mellifera(peroral) LD50(48 h)>100 μg a.i./bee;A. mellifera(contact) LD50(48 h)>100 μg a.i./bee;E. foetida LC50(14 d)>1.00×10^2 mg a.i./kg dry soil. According to the Guidance for Evaluating and Calculating Degradation Kinetics in Environmental Media for Pesticide Registration, prochloraz-manganese chloride complex had low toxicity to A. mellifera, C. coturnix, B. mori and E. foetida, medium toxicity to D. magna and B. rerio, and high toxicity and low risk to S. obliquus and T. japonicum. [Conclusions] This study provides a data basis for the toxicity and environmental safety evaluation of the agent.
