| Recently, Forest insect pest control measures are mainly on the aspects of biological control and chemical pesticide use. Biological control in the laboratory under the control of artificial conditions can achieve the ideal effect, however, under natural conditions, biological control technology is difficult to promote, it is subject to the natural environment. This experiment with the use of chemical and biological pesticide emamectin benzoate reagent by trunk injection technique to study the optimal injection time of four species and the amount of the injection and the dynamic changes of emamectin benzoate with time,The results are follows:1. Pharmacy conduction velocity. after 5 months of the injection, the lowest content in pine is 5.10 mg/kg, the highest is 9.61 mg/kg with above 1.5 m of the trunk, the fastest rate of pine stem conduction; The lowest content of willow which above 1.5 m stem is 0.60 mg/kg, the highest content in leaves that above 4 m is 4.44 mg/kg,Willow has the fastest conduction.The lowest content of camphor tree trunk which above 1.5 m is 6.61 mg/kg, the highest content that above 4 m of Cinnamomum camphora leaves is 12 mg/kg, Cinnamomum camphora leaves have the fastest conduction; The lowest content of walnut tree trunk which above 1.5 m is 5.58 mg/kg,the highest content that more than 4 m is 7.86 mg/kg branch, branch conduction is the fastest. however, Lethal concentration with emamectin benzoate of Anoplophora glabripennis is 0.7 mg/L, and explains emamectin benzoate can protect the four tree species from Anoplophora glabripennis after five months of trunk injection.2. The most appropriate time of application.According to the biological characteristics of forest diseases, insect pests and their living habits and different tissue harm trees of different,time to carry out comprehensive prevention and treatment scheme.A.glabripennis general spawning by the end of May, feathering in June and July, willow generally sprout in March and April, therefore, at the end of January and in early February are the best time to inject, which is available for the prevention and control of Anoplophora glabripennis willow hazards;In general, changes occurred in June and August, at the end of march and begin of April are the best injection in thecamphor tree, which can achieve the best control effect;At the end of October to make drug injection, can controlthe harm of aphids and spawns.3. Stability reagents. After 5months of the injection, compared with four trees, Camphor has the highest content which is 12 mg/kg, ang also has the highest stability; while, the lowest is willow which is 4.44 mg/kg and relatively with low stability.4. The optimal dose, the DBH of the processing plants is between 5.8 cm to 17 cm while the dosage is between 50 ml to 100 ml. There are dosages of the processing plants with 2 percent emamectin benzoate injection after five momths. pine is between 579.04 ml/m 3 to 809.84 ml/m 3, willow applying pesticide dosage were between 2679.46 to 4392.71 ml/m3, camphor tree pesticide dosage were between 920.60 to 1663.43 ml/m 3, pecan trees applying pesticide dosage between 2374.95 to 3542.98 ml/m 3. And moisture content such as measured willow leaf water content was 57.44%. Lethal concentration at the same time as with emamectin benzoate for Anoplophora glabripennis is 0.7 mg/L, explains the experiment applying pesticide dose for main insect pests control effectively to the selected tree species. |
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