Die Embryonalentwicklung vonLeoptinotarsa decemlineata Say,Epilachna sparsa Herbst undEpilachna vigintioctomaculata Motsch var.niponica Lewis in Abh? von der Temperatur

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Sp?tfr?ste und Massenwechsel vonTortrix viridana L.Lep. Tortr.)

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Efficiency of planting hybrid larch F1 ( Larix gmelinii var. japonica × L. kaempferi ) at different planting densities and using seedlings or rooted cuttings

The efficiency of planting a hybrid larch F₁ at two planting densities and of using seedlings of hybrid larch F₁ or rooted cuttings of Gream, the registered variety, was investigated. Significantly more time was required to move from one planting spot to the next in plots with 625 seedlings/ha than in plots with 1,333 seedlings/ha, but there was no significant difference between seedlings and rooted cuttings. Approximately 18% more time was needed to plant a single planting stock at the low planting density than at the high density. The need to prune roots or enlarge a planting hole occurred more often for rooted cuttings than for seedlings, and 17% more time was needed to plant rooted cuttings of Gream than seedlings.     

Nastojas?ie Moli(Tineidae) ?ast tretja PodsemeistvoTineinae

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野柿Diospyros kaki Thunb.var.sylvestris Makino

柿树科柿树属落叶乔木。枝、嫩枝密被柔毛。叶纸质,卵状椭圆形至倒卵形,长5~18 cm,宽2.8~9 cm,先端渐尖,基部楔形、圆形或微心形;老叶叶背被柔毛或被稀疏短毛;侧脉5~7;叶柄长0.8~2 cm,后变无毛。雌雄异株,但间或雄株中有少数雌花,雌株中有少数雄     

Growth analysis of the competition–density effect in non-self-thinning Populus deltoides and Populus?×?euramericana plantations

The competition–density (C–D) effect for non-self-thinning Populus deltoides and Populus × euramericana plantations from 3 to 9 years was analyzed using the reciprocal equation of the C–D effect. The C–D effect was well described by the reciprocal equation, and with the progress of time the C–D curve, on logarithmic coordinates, of the P. × euramericana plantations shifted upward faster than that of the P. deltoides plantations. With increasing physical time t, the biological time τ, i.e. the integral from zero to t of the coefficient of growth λ(t) in the general logistic curve with respect to t, increased rapidly during early growth stages and the increases in τ gradually became slow during later growth stages. This trend was more evident in the P. deltoides plantations than in the P. × euramericana plantations. The coefficients A and B included in the reciprocal equation were calculated at each growth stage. With increasing τ, the coefficient A, the reciprocal of which means the asymptote of yield (=wρ) at a given growth stage, increased abruptly to a maximum value and then tended to decrease gradually to a constant level. On the other hand, the coefficient B, the reciprocal of which means the asymptote of mean stem volume at a given growth stage, decreased exponentially and tended to be close to zero with increasing τ. The λ(t) decreased with increasing stand age, whereas the final yield Y(t) defined as W(t) ρ, where W(t) is the asymptote of w in the general logistic growth curve, increased gradually with increasing stand age. The differences in coefficients A, B, and λ(t) between the two species were reported.     

DieOxyuroidea der europ?ischen Arthropoden

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白珠树Gaultheria leucocarpa var.cumingiana（Vidal）T.Z.Hsu

白珠树是重要的芳香植物,枝、叶含芳香油0.85%,主要用于高级化妆品,为天然型精细化工原料。由于其开花乳白色,花冠钟形而下垂,果红色且果期较长,因此又是珍贵的园林观赏植物,可用于公园、盆景等艺术。白珠树是杜鹃花科白珠属植物,常绿灌木,高1～1.5 m,全株无毛,枝绿色或带淡红色,左右曲折。叶卵圆形,基部浅心形或宽圆形,边缘具锯齿,先端尾尖。