Pyrus pashia Buch-Ham, a wild specie was used to investigate the physiological effects of iron deficiency in culture solution. The result showed that Chla, Chlb, total chlorophyll content and photosynthesis rate(Pn) d...Pyrus pashia Buch-Ham, a wild specie was used to investigate the physiological effects of iron deficiency in culture solution. The result showed that Chla, Chlb, total chlorophyll content and photosynthesis rate(Pn) decreased sharply, and the decrease of Pn was prior to that of Chl content under the iron deficiency. The iron deficiency symptoms were visible when the iron concentration in culture medium was less than 25 μmol L-1. Peroxidase(POD) and catalase(CAT) activity in iron-deficient leaves declined significantly, and POD was more sensitive than CAT to Fe deficiency. However, the positive correlation between CAT activity and Chl content was more significant than that between POD activity and Chl content. The content of nutrient elements in Fe-deficient leaves, which changed irregularly, were higher than that in normal leaves. There were a most significant positive correlation between active Fe and Chl content, and between active Fe and Pn respectively. Therefore, active Fe could be useful physiological predicting index for diagnosis.展开更多
[Objective]The paper was to understand the biological characteristics of Trabala vishnou Lefebure. [Method]Using the combination methods of field survey, caged observation in forest and indoor rearing observation, the...[Objective]The paper was to understand the biological characteristics of Trabala vishnou Lefebure. [Method]Using the combination methods of field survey, caged observation in forest and indoor rearing observation, the morphological characteristics, biological characteristics and natural enemies of T. vishnou in Qinzhou Kangxiling Mangrove Natural Reserve in Guangxi Province were investigated.[Result]T. vishnou occurred for 4- 5 generations each year in Qinzhou Mangrove Nature Reserve of Guangxi, the developmental duration of each generation averagely was 57.64 d. The pest survived the winter as eggs, mature larvae or pupae, and the overwintering eggs, mature larvae and pupae began to occur in December.[Conclusion]The study provided a scientific theoretical foundation for the prediction and control of T. vishnou.展开更多
[Objective]The paper was to screen pesticide that could effectively control Latoia pastorlis （Butler）, and provide reference for its utilization in fields. [Method]The indoor control efficacy of 25% benzoylphenal ur...[Objective]The paper was to screen pesticide that could effectively control Latoia pastorlis （Butler）, and provide reference for its utilization in fields. [Method]The indoor control efficacy of 25% benzoylphenal urea, 30% trichlorfon, 16 000 IU/mg Bacillus thuringiensis and Beauveria bassiana on 2-3 instars larvae of L. pastorlis were determined, and the indoor toxicity of 25% benzoylphenal urea and crystal trichlorfon on shrimp was also tested. [Result]Four pesticides all had insecticidal effects on 2-3 instars larvae of L. pastorlis, of which 30% trichlorfon 800, 1 000 and 1 500 times and 25% benzoylphenal urea 800 times had the best control effect. Crystal trichlorfon with the concentrations of 0.500, 0.100, 0.010 mg/L and 25% benzoylphenal urea 8 000, 10 000, 15 000 times had little or no impact on shrimp, respectively.[Conclusion] 30% Trichlorfon was rapidly available with small impact on shrimp, which were suitable for emergency use or daily control of L. pastorlis. 25% Benzoylphenal urea and 16 000 IU/mg B. thuringiensis had relatively slow insecticidal effect, which was suitable for daily control of L. pastorlis.展开更多
文摘Pyrus pashia Buch-Ham, a wild specie was used to investigate the physiological effects of iron deficiency in culture solution. The result showed that Chla, Chlb, total chlorophyll content and photosynthesis rate(Pn) decreased sharply, and the decrease of Pn was prior to that of Chl content under the iron deficiency. The iron deficiency symptoms were visible when the iron concentration in culture medium was less than 25 μmol L-1. Peroxidase(POD) and catalase(CAT) activity in iron-deficient leaves declined significantly, and POD was more sensitive than CAT to Fe deficiency. However, the positive correlation between CAT activity and Chl content was more significant than that between POD activity and Chl content. The content of nutrient elements in Fe-deficient leaves, which changed irregularly, were higher than that in normal leaves. There were a most significant positive correlation between active Fe and Chl content, and between active Fe and Pn respectively. Therefore, active Fe could be useful physiological predicting index for diagnosis.
基金Supported by Projects of Guangxi Forestry Research Institute[KLKZ(2009)12]
文摘[Objective]The paper was to understand the biological characteristics of Trabala vishnou Lefebure. [Method]Using the combination methods of field survey, caged observation in forest and indoor rearing observation, the morphological characteristics, biological characteristics and natural enemies of T. vishnou in Qinzhou Kangxiling Mangrove Natural Reserve in Guangxi Province were investigated.[Result]T. vishnou occurred for 4- 5 generations each year in Qinzhou Mangrove Nature Reserve of Guangxi, the developmental duration of each generation averagely was 57.64 d. The pest survived the winter as eggs, mature larvae or pupae, and the overwintering eggs, mature larvae and pupae began to occur in December.[Conclusion]The study provided a scientific theoretical foundation for the prediction and control of T. vishnou.
基金Supported by Research Projects of Guangxi Academy of Forestry[GLKZ(2009)No.12]
文摘[Objective]The paper was to screen pesticide that could effectively control Latoia pastorlis （Butler）, and provide reference for its utilization in fields. [Method]The indoor control efficacy of 25% benzoylphenal urea, 30% trichlorfon, 16 000 IU/mg Bacillus thuringiensis and Beauveria bassiana on 2-3 instars larvae of L. pastorlis were determined, and the indoor toxicity of 25% benzoylphenal urea and crystal trichlorfon on shrimp was also tested. [Result]Four pesticides all had insecticidal effects on 2-3 instars larvae of L. pastorlis, of which 30% trichlorfon 800, 1 000 and 1 500 times and 25% benzoylphenal urea 800 times had the best control effect. Crystal trichlorfon with the concentrations of 0.500, 0.100, 0.010 mg/L and 25% benzoylphenal urea 8 000, 10 000, 15 000 times had little or no impact on shrimp, respectively.[Conclusion] 30% Trichlorfon was rapidly available with small impact on shrimp, which were suitable for emergency use or daily control of L. pastorlis. 25% Benzoylphenal urea and 16 000 IU/mg B. thuringiensis had relatively slow insecticidal effect, which was suitable for daily control of L. pastorlis.
