叶斑病

The inhibiting effect of low molecular weight chitosans with different molecular weights on 13 plant pathogenic bacteria such as Helminthosporium oryzae were studied by detecting the minimum inhibitory concn. and inhibitory circle.

方法］通过测定最小抑制浓度和抑制圈，研究不同分子量的低分子量壳聚糖对稻胡麻叶斑病菌等13个植物原病菌的抑制作用。

Based on using those specific PCR primers, a unique 190 bp hand was obtained by PCR amplification from genomic DNA of Venturia inaequalis of apple and it can be accurately distinguished from patbogens of Alteraria mali, Marssonia mali and Podosphaera leucotricha, the common apple leaf spot diseases.

利用这对引物能从苹果黑星病菌基因组DNA中扩增出一条分子量为190bp的特异性条带，准确地把苹果斑点落叶病、苹果褐斑病和苹果白粉病等常发性苹果叶斑病害区分开。

Pathogenieity and virulence of the isolates were assessed; Soluble mycoprotein and esterase etc isoenzynie patterns of 43 isolates were analyzed; Genetic diversity among 40 isolates of Curvularia lunata was evaluated by random amplified polymorphic DNA fingerprint.

通过对43个新月弯孢分离物的3种同工酶及可溶性蛋白分析和40个分离物的RAPD指纹图谱分析，表明玉米弯孢菌叶斑病病原群体存在遗传多样性。

The results showed that it was a new pathogen, belonging to Septoria sp.

结果表明，八角莲叶斑病为八角莲上一种新病害，其病原菌为壳针孢属（Septoria sp。

Field efficacy trials indicated relativity good control of banana sigatoka leaf spot disease .

田间药效试验结果表明，对香蕉叶斑病有较好的防效。

One of the most important factors responsible for the low yields is the lack of adequate nutrition and fertilization programs. Other factors are nematodes and black sigatoka.

低产重要原因之一是养分不足和缺少施肥计划，其次为线虫和香蕉叶斑病。

In the 1970s a disease named Black Sigatoka was beaten back with enthusiastic applications of pesticide, but more recently a new strain of the original bane of the banana has threatened the plantations.

然而后来它也不得不为自己的生存打一场硬仗了。70年代伊始，杀虫剂的大规模使用击退了黑叶斑病，但很快新的变种病毒成为种植园的心头大患。

In Costa Rica, maximum yield research has demonstrated that yields of 3500 exportable boxes/ha/year are possible using the adequate amount of fertilizers along with adequate crop management practices which include 12 split applications of the recommended rate of fertilizers, nematode and sigatoka control and good drainage.

哥斯达黎加的最大产量研究结果表明，经12次分期充足施用推荐量肥料、防治线虫和叶斑病和良好排水等作物管理措施，产量可达3500出口货箱/公顷/年。

The principal best management practices for Costa Rica are: a well drained soil or a good drainage system in the field (banana yield is hurt with only a few hours of oxygen depletion in the root zone), b adequate control of nematodes, c adequate control of black sigatoka and d a good fertilizer program which includes rates of fertilizer equal or higher than 300-300-600 kg/ha/year of N- P2O5- K2O split in 12 applications during the year.

这些最好的管理措施为： a ）良好排水土壤或田间良好排水系统（根区缺氧几小时就会损害香蕉产量）， b ）有效地防治线虫， c ）有效地防治香蕉叶斑病和 d ）良好的施肥计划，施肥量等于或高于300-300-600公斤 N - P2O5- K2O /公顷/年，一年中分12次施入。

Leaf spot was one of the serious fungal diseases in blackcurrant culture in Heilongjiangprovince. It disserved leaves and formed a lot of light brown spots as soiled on leaves in initialstages, then the spots turned into brown, in the end the spots turned into grey hoar and pycnidiumappeared in the center of the spot, leaves turned yellow and fell off earlier, influenced the outputand quality.

叶斑病是近年黑穗醋栗生产栽培中发生较严重的一种病害，主要侵染植物的叶片，初期在叶片上形成浅褐色水渍状斑点，稍后斑点变褐，后期病斑浅灰色或灰白色，斑点中心形成黑色孢子器，叶片变黄卷曲，提前脱落，从而引起黑穗醋栗产量及果实质量的下降。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失