A STUDY ON XINGKAI LAKE PINE GALL RUST

The xingkai Lake pine(Pinus lakahasii Nakai) gall rust caused by Cronartiumquereuum(Berk.)Miyabe:Shirai is a serious stem rust in the northeast region of China.The alternatehost is oak (Quercus mongolica Fisch).Germination of both acciospores and urediospores wasoptimal at 12℃ and occurred over a range of temperatures,from 4℃ to 32℃.Teliosperes germinatedoptimally at 16--18℃ and over a range of 8--28℃.All spores germinated best under natural light anddark conditions.Direct light inhibited germination eren when followed by darkness.The incubauonperiods of urediospores and teliospores in inoculation experiments were 6--16 days and 3--33daysrespectively. Anatomical studies of Cribartium quercuum galls showed that rust hyphae freely ramify throughthe intereellular spaces within parenchymatous lissues of the cortex,phloem,cambium,and xylemHyphac are perennial;largc haustoria are cylindrical with rounded or blunt ends. Among the 12 fungieides tested for control the rust,pine-tar,pine-tar;diesel oil(1:1。

重大园林植物病害及其研究进展

系统地介绍了国内外重大的园林植物病害:松材线虫病、榆树荷兰病、五针松疱锈病、观赏植物冠瘿病、香石竹尖镰孢枯萎病和菊花叶枯线虫病,综述了这些病害的国内外研究进展。

黄山松栎锈病防治技术研究

为筛选防治黄山松栎锈病的有效药剂,采用孢子萌发的方法测定了8种药剂对黄山松栎锈病锈孢子的室内毒力,并对初筛的3种药效较好的药剂进行田间药效试验。结果表明,丙环唑、退菌特、甲基托布津在室内试验的3个浓度下对松栎锈病菌锈孢子的抑制效果最好。野外防治试验表明对黄山栎和茅栗均有较好防治效果是丙环唑,其次是甲基托布津,退菌特的防效稍差。

松树常见病害的发生与防治

本文对松烂皮病和松瘤锈病的病原、侵染循环、流行规律、危害症状进行介绍,并总结了相应综合防治措施。