The occurrence regularity of Phyllocnistis citreua in northern Guizhou was investigated,and the relationship between summer shoot controlling of citrus and occurrence of P. citreua was studied. The results showed that...The occurrence regularity of Phyllocnistis citreua in northern Guizhou was investigated,and the relationship between summer shoot controlling of citrus and occurrence of P. citreua was studied. The results showed that P. citreua occurred from May to September every year in northern Guizhou,and the occurrence reached the peak from early May to late June and from early July to late August. The occurrence in early and mid July was the most serious. The free-sprouting time had a close relationship with occurrence quantity and damage level of P. citreua. The earlier the free-sprouting time was,the greater the occurrence quantity and damage level of P. citreua was. The integrated control techniques focused on timely erasing summer shoots and controlling shoots were suggested to use in production,in order to control the occurrence of P. citreua.展开更多
The effect of foliar spray of young lemon trees with Chitosan (CH) (200 - 300 - 400 ppm), on antioxidant enzymes activities (peroxidase POD, polyphenol oxidase PPO) and total phenolic content, and their influence on l...The effect of foliar spray of young lemon trees with Chitosan (CH) (200 - 300 - 400 ppm), on antioxidant enzymes activities (peroxidase POD, polyphenol oxidase PPO) and total phenolic content, and their influence on leaf miner (Phyllocnistis citrella) activity (tunnel length and damage density) under field condition was investigated. The results showed that treatment with chitosan 300 ppm enhanced the total phenolic content (5.975 mg/g) and the POD activity (0.533 min<sup>-1</sup> mg<sup>-1</sup> protein), while PPO activity was increased by chitosan 200 ppm (1.394 ΔA/min/g FW). The results demonstrated as well that chitosan treatment has a beneficial effect in reducing leaf miner activity, by decreasing tunnel length and damage density.展开更多
文摘The occurrence regularity of Phyllocnistis citreua in northern Guizhou was investigated,and the relationship between summer shoot controlling of citrus and occurrence of P. citreua was studied. The results showed that P. citreua occurred from May to September every year in northern Guizhou,and the occurrence reached the peak from early May to late June and from early July to late August. The occurrence in early and mid July was the most serious. The free-sprouting time had a close relationship with occurrence quantity and damage level of P. citreua. The earlier the free-sprouting time was,the greater the occurrence quantity and damage level of P. citreua was. The integrated control techniques focused on timely erasing summer shoots and controlling shoots were suggested to use in production,in order to control the occurrence of P. citreua.
文摘The effect of foliar spray of young lemon trees with Chitosan (CH) (200 - 300 - 400 ppm), on antioxidant enzymes activities (peroxidase POD, polyphenol oxidase PPO) and total phenolic content, and their influence on leaf miner (Phyllocnistis citrella) activity (tunnel length and damage density) under field condition was investigated. The results showed that treatment with chitosan 300 ppm enhanced the total phenolic content (5.975 mg/g) and the POD activity (0.533 min<sup>-1</sup> mg<sup>-1</sup> protein), while PPO activity was increased by chitosan 200 ppm (1.394 ΔA/min/g FW). The results demonstrated as well that chitosan treatment has a beneficial effect in reducing leaf miner activity, by decreasing tunnel length and damage density.
