叶枯病

The research activities were briefly highlighted as follows: They were yield nurseries, observational nurseries, tolerance/resistance screening nurseries (cold, drought, salt/acid, blast. bacterial leaf blight, rice tungro virus, brown planthopper and white-backed planthopper resistances). These studies with evolving technologies are aimed at improving crop production.

其研究活动着重于以下几方面：产量反应，生长观察，耐性/抗性筛选（抗冻、抗旱、抗盐/酸、抗稻瘟病、白叶枯病、水稻塘古罗病毒、褐稻虱和白背飞虱），其目的就是为了提高产量。

Growing Hevea in the Americas is hard. A disease called leaf blight means the trees have to be spaced widely.

要在美洲种植橡胶树很难，因为有一种叫做&叶枯病&的病害存在，橡胶树的间距必须很大。

Pachira macrocarpa common diseases are the root and leaf rot.

发财树常见的病害有根腐病与叶枯病。

Bacterial needle blight of Chinese Fir was one of the main diseases in Chinese fir forests,which was caused by Pseudomonas syringae pv.

杉木细菌性叶枯病是杉木的主要病害之一，由丁香假单胞杆菌杉木致病变种Pseudomonas syringae pv。

Biological characteristics of the pathogen and the resistance of 13 cultivars of tea plant to tea brown blight were studied by means of natural infection in the field and artificial inoculation in vitro. Resistant cultivars and susceptible cultivars of tea plant were divided. And the resistance mechanism was researched tentatively. The findings are as follows: 1 Some biological characteristics of the pathogenic fungus The experiment result showed: the optimum temperature for the growth of fungus mycelium was from 24 to 27℃, the optimum temperature for sporulation ranged 22 to 30℃. Treated at 54℃ in 10 minutes, the spores didn't germinate. The optimum pH for the growth of the mycelium was 5.1～5.9, the optimum pH for sporulation ranged 5.0～6.0. Light had no much effect on the growth of fungus mycelium, but had much effect on the reproduction of the spore.

首先，研究了茶云纹叶枯病病菌的生物学特性；其次，通过田间抗性调查和室内人工接种鉴定，对 13 个茶树品种进行了抗病性鉴定；第三，在前人研究的基础上，对茶树抗病机理作了更深入的研究，结果发现： 1 病原菌的生物学特性病原菌的分生孢子萌发的最适温度范围为 24～27℃，菌丝生长的最适温度范围为 22～30℃；致死温度为 55℃；菌丝生长的最适 pH 范围为 5.1～5.9，孢子萌发的最适 pH 范围是 5.0～6.0；光照对病菌生长速度及分生孢子萌发影响不大，但对其产孢的影响很大，特别是有光照与无光照处理之间差异显著，光照有利于分生孢子的形成。

In the experiment, the tea plant shoots were cultured in vitro, and inoculated artificially. The result showed the disease condition in vitro was basically consistent with that of the tea plantation in nature. Therefore, we thought this identification method of tea plant resistance to tea brown blight was feasible, especially a large number of cultivars.

本试验采用离体插枝培养法，人为造成伤口、人工接种并保湿对茶树品种进行抗性鉴定，室内人工接种与田间自然发病的情况基本一致，因此，可以认为此方法对茶树品种抗云纹叶枯病鉴定是可行的。

Thus, prevention and cure for rice stripe blight has become an important object in Shanghai farm.

因此，水稻条纹叶枯病的防治以成为上海农场的重要课题。

Rice stripe blight occur only bits and pieces and didnt result in obvious harm from 2001 to 2003, and quantity of Laodelphax striatellus Fallen was very low and only in part place it was more serious.

从2001年至2003年条纹叶枯病一直处在零星发生状态，未构成产量威胁，灰飞虱的发生也一直处在低值状态，仅局部地方发生较重。

The early paddy rice main plant disease for the rice blast, Bai Yehk'u the sickness, grain dry sickness, the paddy rice negative putty insect, the hard beetle, brown flies a louse Tryporyza incertulas and the Chilo suppressalis and so on, in recent years by the paddy rice water trunk insect and paddy rice vertical volume Ye Ch'ung, the lump wild snout moth occurred seriously.

早期水稻主要的病虫害为稻热病、白叶枯病、纹枯病、水稻负泥虫、铁甲虫、褐飞虱三化螟及二化螟等，近年来则以水稻水象鼻虫及水稻纵卷叶虫、瘤野螟发生较为严重。

In the paper the pathogen, symptom and biological characteristics of maize leaf spot were studied.

对玉米交链孢叶枯病的病原、症状、生物学特性等进行了初步研究。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。