Study On The Damage Of Anoplophora Chinensis In Quercus Virginiana And Salt Tolerance Of Q.virginiana

We studied on the pest situation of Quercus virginiana after introduction and made sugguestions about the pest control of Anoplophora Chinensis. Moreover, we discussed on the salts resistance mechanism of Quercus virginiana. We confirmed that Anoplophora Chinensis is one of pest species which caused serious harm to oak mixed forest ,we also did forest survey and laboratory selective test on its damage habits in four types of oak mixed forest; we preliminary studied the relationship between the composition of four oak volatile and the degree of pest damage; Furthermore, a sand culture of Hoagland experiment was carried out to investigate Quercus virginiana under high (150 mmol/L NaCl) and low (50 mmol/L NaCl) salt stress about the changes including dynamic trend about physiological parameters of leaves and some morphological parameter after 2 months, we investigated its salts resistance mechanism and got following conclusions:1.We make the pest-insect survey in Zhejiang Fuyang Xindeng and Sanqiao, Changle, Shanghai Songjiang Forest Farm and found Anoplophora chinensis is one of the very serious pest in mixed forest of oak forests. In the Fuyang area, the preference of A. chinensis adults for 8 host plants in the phase of supplermentary feeding was observed both in field and in laboratory and used various branches to do bioassay experiments. Acceptabilty of A. chinensis adult were Quercus phellos L., Quercus virginiana, Quercus nuttallii Palmer, Quercus nigra L., Fraxinus pennsylvanica ranging from high to low. Therefore infer the approach to decrease Anoplophora chinensis damage to Quercus virginiana is adding proper amount bait-trees,like Betula nigra, Acer negundo, cer saccharinum in oak forests.2. We analyzed the relative content and chemical composition of four oak volatile by solid phase micro-extraction method, found that total amount of alkanes and ester matter in oak branches was quercus phellos, Anoplophora Chinensis, water oak , nata oak from more to less;and total amount of alcohols and aldehydes matter was water oak, Q. virginiana, quercus phellos, nata oak from more to less. Synthetic all material relative content we found susceptible Quercus virginiana oak released more alkanes and ester matter while the less harm ones released more alcohols and aldehydes matter.3.Two kinds of oak trees under low salt and Q. virginiana under high salt stress could survive, Proline of Q.virginiana leaves adapt to salt stress in 21st day and it also adapt to high salt stress; determination of the whole dynamic process of salt stress in leaves chlorophyll content of Q.virginiana in the high-salt stress were higher than the control; MDA content of Q.virginiana leaves were lower than the control in low-salt within 35 days and high salt in the 21st; Study the resistance to antioxidant activites of the leaves showed the Q.virginiana have a positive reaction to mobilize antioxidation system in order to adapt to salt stress and in the positive response under high salt stress. It was found that:Root-shoot ratio was increase With the increase of salt concentration. The content of Na~+,Cl~- in root were higher than those in aboveground. K~+ /Na~+ in the plants is root