.30% Dichlorvos, Oxygen And Music Note To Dry The Liquid On The Injury Mechanism And Efficacy Study Of Woody Plants

The thesis studied the phytotoxicity, efficiency and absorption of 30% dichlorvos and omethoate injection pesticide in woody plant, showed the phytotoxicity by means of the plant Resistance to Environmental Stresses and discusssed the relationship between change of phsi-ological and biochemical indexes and phytotoxic.Experiment showed the causes of phytotoxic of 30% dichlorvos and omethoate to apple tree were quick absorption, unilateral translocation and the tolerate threshold value of plant tissue to pesticide was exceeded in short time. Two main phytotoxicity mechanisms were gained by studies on poplar and apple trees: firstly, pesticides can cause plant cell membrane departed from cell wall because of the high concentration. Secondly, can cause cell membrane relative permeability increased and membrane lipid peroxidation. Each components of mixed pesticide can damage the structure of poplar leaves, and the symptoms of omethoate were more obvious than dichlorvos. Pesticides damaged cell membranes, which appeared oxidizing, increased the permeability of cell membranes in poplar trees, so that SOD, POD enzyme activities were inhibited, polyphenol oxidase activity increased at first, then reduced. SOD and POD enzyme activity in apple leaves were remarkably inhibited and the content of MDA was increased.The pesticide had a remarkable interference on chlorophyll a/b, photosynthesis rate, CO, concentration of cell and evaporation rate, free proline accumulating.Experiments showed that the ratio of pesticide and water could objectively reflect plant ability" to absorb solvent, the higher ratio, the more absorption.The plant ability' to absorb dichlorvos and omethoate were: P. alba var bolleanu>M. pumilla>S. japonica. We found there existed a great difference in absorption to 30% diohlorvos and omethoate diluted 5 times among eleven woody plants, the rank of absorption from higher to lower were Crutagus pinnatifida, Pruns persica, M. Pumila, Ligustrus lucidum, Diospyros kaki, Aesculus chinensis, Plutycladus orientalis S. Japonica, Paulownia spp., Populus spp. and Juglans regia.Field experiments demonstrated that efficacy of 30% dichlorvos and omethoate for Drosicha corpulenta was 95.9% and Psylla willieti 96.4%. For Anoplophora glabripennis and Apriona swainsoni also gained perfected efficiency.