Investigation Of Forestry Pest In Guangzhou City

With the rapid growth of pop ulation and the increasing activity of economy and trade,Guangdong Province,as a big province of forestry and economy,has been increasing the pressure of controlling the pest.Guangzhou,as the capital city of Guangdong Province,is rich in forest resources,forestry land area,stumpage,and forest resources.There are seeral characteristics in Guangzhou forest,pure forest,young and middle aged forest,single layer forest,sparse and remnant forest are in big quantity.Mixed forest,mature forest,double layer forest,quality forest are in small quantity.Guangzhou owns a large area of forestry land,but also has many problems,such as irrational forestry structure,poor stability,little ecological function.Therefore,forestry pest disaster prone to o utbreak,and is difficult to control.Forest pest investigation helps to understand the status of forestry pest,take preventive measures timely,and establish forestry and garden pest database,provide data support and suggestion on forest management.The forestry pest adopted line survey and auxiliary survey to investigated the forestry pest in forestry land,green land,etc..The results are following.The survey collected a total of more than 2100 specimens,shooting the pest biology,ecology and the impact of such pictures 7861.213 species of pests(Including 172 species of pests,28 species of diseases and 13 species of harmful plants)were found,including 11 species of exotic species,202 species of native species,5 species of forest quarantine pests,1 species of forest quarantine pests in Goungdong Province,13 species of hazardous pests(excluding quarantine pests)and 194 species of pests.The forest quarantine objects found in this census are Solenopsis invicta,Phenacoccus solenopsis,Rhynchophorus ferrugineus,Bursaphelen chusxylophilus,Mikania micrantha,Leptocybe invasa,the risky pests,are Hemiberlesia pitysophila,Monochamus alternatus,Oracella acuta,Anchophora chinensis,Crontispa longissima,Cyrtotrachelus longimanus,Tomicus minor,Tomicus Piniperda,Chilades pandava,Balansia take,Opisina arenosella,Cassytha filiformis,Taxillus sutchuenensis.Icerya legitimacy,eucalyptus a gruel bee,rusty palms,coconut palm leaves,coconut moths,coconut moths,coconut moths,coconut moths,pine wood nematode and Mikania micrometer.Which is the most widespread distribution of pine wood nematode,the most serious harm;Although H.pitysophila is widely distributed,but it has not been a disaster in insects;Mikania micrometer,red fire ants have been all over the area,local disaster;coconut moth There is the possibility of continued proliferation;other alien forestry pests are sporadic.Compared to the 1983 census data,the survey started raising a total of 69 new records in Goungzhong C ity,Including 57 New records of pests,five new records of disease,seven new records of harmful plants.The characteristics of Guangzhou forestry pest are as following: first,the total number of forestry pests changed little,but the species changed greatly.Second,the incidence of major pests,diseases and the occurrence area had taken great change,the disaster situation has also changed.The invasion rate of exotic forestry pest was accelerating.