华山松主要种实害虫种类及发生危害调查

2002-2003年对不同发育期华山松球果的长度、直径及含水率进行了跟踪,并同期对危害华山松球果的种实害虫种类及危害情况进行了调查,共发现害虫7种,隶属于5科5属,主要的有5种。虫害贯穿于华山松球果发育的整个阶段。在种鳞发育期,球果花蝇(Strobilomyia sp.)、球果瘿蚊(Resselille sp.)主要危害1年生华山松球果;微红梢斑螟(Dioryctria rubella)和云南松梢斑螟(D.yuennanella)幼虫在球果快生长期及球果木质化期危害2年生华山松球果。华山松球蚜(Pineus piniarmandii)全年大部分时间均能对华山松球果造成危害,但造成落果较少。华山松球果含水率与华山松主要种实害虫的危害关系密切,种实害虫危害与华山松球果发育基本同步。

Investigations on the major species and damages of cone and seed insect pests on Pinus armandii with cone development of Pinus armandii

The length,diameter and water content of armand pine cones in different growth periods were trached and accordingly,the species and damage conditions of cone and seed insects were investigated during 2002-2003.Seven species belonging to 5 genera and 5 families were discovered.The study indicated that there were 5 insect species that damaged cones and seeds prominently,and the damage covered the whole growth period of the armand pine cone.Strobilomyia sp.and Resselille sp.occurred in concomitant with the growth period of cone squama and only fed on 1-year-old cones.The larvae of Dioryctria rubella and D.yuennanella damaged 2-year-old cones during the rapid growth period and the cone lignification period.Pineus piniarmandii could damage the cones mostly in a whole year,but it did not result in cone loss seriously.The water content of the armand pine cones was closely correlative with the damage of the cones by seed insects.The damage of the insects was synchro with the development of the cones.