小菜蛾

The root of Leptopus Chinensis Pojark, belonging to Euphorbiaceae, was extracted with petroleum ether, chloroform and methyl alcohol by different methods. Insecticidal activitives of crude extracts and fractions against Plutella xylostella were tested, and its effects on activities of several enzymes from the pest were evaluated.

本研究以大戟科植物雀儿舌头为实验材料，用多种有机溶剂和不同提取方法对雀儿舌头的根进行抽提，用抽提物及其萃取物分别对危害蔬菜的重要害虫--小菜蛾进行了生物活性测定及几种酶活性的影响，实验结果如下： 1。

Bioassay showed that the product of the cloned gene was strongly toxic to Heliothis armigera and Plutella xylostera larvae.

生物学实验表明，此表达产物对棉铃虫和小菜蛾幼虫具有强毒杀活性。

In the insecticidal test, compounds 2-29 exhibited the most potent effect against Plutella xylostella and a moderate effect against Heliothis virescens.

在农业常见害虫的杀虫活性测试中，化合物2-29几乎完全抑制小菜蛾的生长，对 Heliothis virescens也有中等强度的抑制效果。

Bioassay showed that the LC50 of cry1Ab22 against Plutella xylostella larve with a spread method was 225.1 μg/mL.

SDS-PAGE电泳结果表明，cry1Ab22基因表达了170 ku左右的融合蛋白。cry1Ab22蛋白对小菜蛾的LC50为225.1μg/mL。

The benzene fraction of the liquid-liquid partitioning was found to be the most active against the larvae of Plutella xylostella and Pieris rapae, with the rate of antifeeding, at ×50 dilution, of 97.7%and 97.3%, respectively, after 12 h exposure.

液—液分配法中，苯提取物的拒食活性最高，在50倍稀释浓度下，小菜蛾Plutella xylostella和菜粉蝶Pieris rapae幼虫对其拒食率分别为97.7%和97.3%。

New research on the virus enhance the Bt pesticide formulations to improve efficiency than Bt 15 to 20 percent, faster effect for 12 hours, killing spectrum from DBM, such as Pieris rapae mainly extended to rice stem borers, Spodoptera litura, beet armyworm, etc. Important pests, and declared a national invention patents.

研究的新型生物农药病毒增强Bt较Bt制剂增效15~20%，作用速度加快了12小时，杀虫谱由小菜蛾、菜青虫等为主扩展到水稻螟虫、斜纹夜蛾、甜菜夜蛾等重要害虫，并申报了国家发明专利。

Based on a systematic field investigation and laboratory experiments, the structures of arthropod communities and the evalution of dominant predatory enemies in cabbage fields of different seasons were studied. The main results were as follows:1 The structures and their dynamics of arthropod communities in cabbage fields1.1 Species composition and population dynamics of each species of the arthropodcommunities in the cabbage fieldsThe research results showed that the occurrence of Pieris rapae in spring cabbage fields was relatively grave.

本文在田间系统调查和室内试验的基础上，对不同季节甘蓝田节肢动物群落结构及捕食性天敌优势种的评价进行了研究，主要结果如下：1甘蓝田节肢动物群落结构及其动态1.1节肢动物群落物种构成和各种群数量动态研究结果表明，春甘蓝田菜青虫的发生比较严重，菜青虫在调查期间种群数量呈上升趋势，5月初高峰期平均每株甘蓝接近20头；菜蚜与小菜蛾的发生相对较轻，菜蚜在5月中旬有个明显高峰。

The correlation coefficient was 0.784 during liquid culture and extremly markedly correlation was identified during Plutella xylostella powder liquid culture but no correlation was found during Pieris rapae powder liquid cultu

在萨氏培养液中，两者相关系数为0.784；在小菜蛾虫尸粉培养液中，两者极显著正相关r一0.9763，F=61 。1 786，p

Screening Room is a strain, the effect of Health measurement room, processing room, and other forms of scientific research facilities, a strain breeding, toxicity screening, new product development, production process technology updates, transformation and application of international standardization, such as the ability to detect, keeping perennial DBM, Pieris rapae, Spodoptera litura, Culex, mosquitoes and other insects and training of a variety of microorganisms.

现具备菌株筛选室、药效生测室、剂型加工室等科研设施，具有菌种选育、毒力筛选、新品开发、生产工艺流程技术更新、改造和应用国际标准化技术检测等能力，常年饲养小菜蛾、菜青虫、斜纹夜蛾、库蚊、伊蚊等多种实验昆虫和培养多种微生物。

Construction and Analysis of the Susceptible Population Life Table of Plutella xylostella L.

小菜蛾敏感种群生命表的组建与分析。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。