Home Publications Tree Improvement and Genetics North Central Tree Improvement Conference 2nd North Central Tree Improvement Conference (1981) Life Table Evaluation of Conelet and Cone Mortality for Jack Pine, Pinus banksiana Lamb., in Wisconsin

Life Table Evaluation of Conelet and Cone Mortality for Jack Pine, Pinus banksiana Lamb., in Wisconsin

The mortality of jack pine conelets and cones was monitored in 1980 using life tables in one natural stand and one plantation in Oneida Co., Wisconsin. The jack pine budworm, Choristoneura pinus pinus Freeman, destroyed 12 percent of the conelets. The relationship between conelet abortion and a mirid, Platylygus tinctus Uhler, is discussed. Squirrels killed conelets as well as cones. The most prevalent insect attacking cones was the cone borer, Eucosma monitorana Kearf., which killed 10 percent. Other insects responsible for lesser amounts of damage were the webbing coneworm, Dioryctria disclusa Heinrich; red pine cone beetle, Conophthorus resinosa Hopk.; jack pine budworm; and cone midges, which causes a total of 4.5 percent mortality. Radiographs of seeds from surviving cones revealed that feeding by the eastern pine seedworm, Laspeyresia toreuta (Grote), accounted for 5.7 percent seed losses, and the shieldbacked pine seed bug, Tetyra bipunctata (Herrich-Schaffer), 3.3 percent.


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Author(s): Aunu Rauf, Robert A. Cecich, D. M. Benjamin

Publication: Tree Improvement and Genetics - North Central Tree Improvement Conference - 1981

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