Ecological Studies on the Population of the Pear Leaf Miner, Bucculatrix pyrivorella KUROKO (Lepidoptera : Lyonetiidae) : VI. Effects of Injury by the Pear Leaf Miner on Leaf Fall and Photosynthesis of the Pear Tree

概要

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Japanese pear trees infested with the pear leaf miner began to shed leaves late in August while in an uninfested orchard leaf fall began late in September. The following relationships were detected between cumulative density of leaf miners (N_2 for the 1st to 2nd generations; N_3 for the 1st to 3rd generations) and the period (D_<50>) from August 15 to the date of 50% leaf fall : log D_<50>=1.885-0.285 log(N_2+1) r^2=0.66 log D_<50>=1.893-0.172 log(N_3+1) r^2=0.82 Net photosynthesis was negatively correlated with cumulative density late in August. Tolerable pest densities were determined to be 0.5 and 1.0 per leaf for N_2 and N_3, respectively.
日本応用動物昆虫学会の論文
1982-05-25