应用白杨透翅蛾性诱剂诱杀白杨透翅蛾成虫的实验

通过几种试验比较,找出诱杀白杨透翅蛾成虫更为合理的方法,并加以分析。     

黑绒金龟成虫期监测与防治

黑绒金龟Serica orientalis Motschulsky分布在内蒙古、辽宁、吉林、黑龙江、河北、山西、陕西、甘肃、河南、江苏、浙江、江西等地，以东北、华北地区危害严重。最喜食杨、柳、榆、果树等，主要以越冬成虫咬食幼树叶、花、芽，给以杨树截干苗造林为主的我国北方地区的新植林造成严重灾害，使刚发芽的幼苗死亡或严重影响幼树的生长，致使林木不能速生。     

舞毒蛾生活史及成虫发生动态监测

<正>舞毒蛾是世界性的大食叶害虫,分布广、寄主植物多,对多种针叶、阔叶树和果树都有危害。在西北地区,主要分布于新疆。在巩留县阿尕尔森乡2011年虫害发生面积为7.3千米2,其中舞毒蛾发生面积4千米2左右,集中发生在5~6月。通过对舞毒蛾年生活史和舞毒蛾成虫发生动态监测,为舞毒蛾在阿尕尔森乡发生情况和潜在发生区的预测以及综合防控提供依据。一、材料与方法     

浅谈打孔注高渗吡虫啉液防治梣天牛技术

<正>梣天牛又名十六星直脊天牛、脊天牛、木岑直脊天牛,属鞘翅目天牛科。是一种以椴树为主要为害对象的蛀干害虫。寄主植物有椴属、木岑属和柳属,在我省分布量较大,危害程度很高。一、梣天牛的生长特性梣天牛幼虫危害椴树主干,成虫危害椴树叶柄,以老龄幼虫在被害树木质部越冬.翌年3月下旬开始化蛹,5月上旬始见成虫,5月中旬为成虫羽化高峰期,5月下旬为产卵盛期,6月上旬为幼虫孵化盛期,幼虫孵化后即危害椴树活     

迟眼蕈蚊蛹和成虫的雌雄鉴别

提出了1种依据外观形态特征,迅速准确鉴别迟眼蕈蚊Bradysia sp.蛹和成虫雌雄性别的方法。雌蛹的第8腹节末端中央有2个大小相同并列排布的圆形突起;雄蛹第8腹节末端有呈三角形排布的3个圆形突起,其中中间的圆形突起较两边的圆形突起略小,区分较为明显。成虫雌性体积明显比雄性大,雄虫腹部末端宽大,有2个呈对称排布的抱握足,向内弯曲;雌虫腹部中部粗大,向端部渐细而尖,腹端具一阴道叉。准确区分雌雄性别对于了解迟眼蕈蚊田间性比,研究其生物学特性、种群动态及开展预测预报等具有重要应用价值。     

大豆食心虫发生规律与防治技术

<正>大豆食心虫,又名大豆蛀荚蛾、豆荚虫等,属鳞翅目小卷蛾科。它食性单一,寄生植物种类较少,主要为害大豆,是黄淮夏大豆产区的主要害虫。它以幼虫蛀食大豆粒,造成出口破瓣,降低大豆产量和品质。近年来,随着大豆种植面积的不断扩大,其为害有逐年加重的趋势。据调查,大豆虫食率一般年份为15%~20%,严重年份达35%~40%。一、发生规律大豆食心虫1年发生1代,以老熟幼虫在豆田、晒场及附近土内做茧越冬,次年7月下旬越冬幼虫开始化蛹,成虫     

某型自行火炮发动机冷却液消耗量过大故障原因分析及处理

正当某型自行火炮发动机冷却液消耗量过大(大于1 L/h)时,随着冷却液量的减少,水温表感受器会逐渐露出水面,这时水温表指示逐渐降低,而油温表温度会随发动机温度的升高而升高。此时发生水温降低、油温升高的异常现象。发动机发动前若冷却液量不足或冷却液漏完启动发动机时也会出现这种现象。当某型自行火炮出现此故障现象时必须停车检查排除故障。     

应重视果园长绵粉蚧的发生与防治

正长绵粉蚧属同翅目粉蚧科,又名柿绵粉蚧、柿粉蚧、柿长绵蚧,俗称柿蚤子。寄主有柿、苹果、梨、李、无花果、桑、玉兰、法国冬青等果树和园林植物。近年来,随着种植业结构调整,该虫寄主环境发生变化,在危害柿子的同时,危害苹果、梨、李等经济作物。在关中西部果区发生比较普遍,呈现逐年偏重发生趋势,已成为苹果园和柿园的重要害虫,望引起技术人员和果农的高度重视。1发生特点1.1危害症状     

动物的寿命

一些单细胞原生动物,他们的寿命只有7～8个小时。龟算得上是名副其实的老寿星。无论淡水龟还是海龟,寿命都长的惊人,迄今人类已发现的寿命最长的巨龟已活800年以上,至今生命力依然十分旺盛。昆虫的寿命。昆虫的寿命一般都很短,如蜻蜓的寿命为1～2个月,苍蝇的寿命只有15～25天。被形容为朝生暮死的蜉蝣,他的成虫寿命只有一天。鱼的寿命。鱼的寿命长短不一,鲫鱼10年,鲤鱼25年,金鱼30年,鳗鱼50年。海中的一些大型鱼类一般寿命都很长,比如鲨鱼具有一生不得病,受了伤也不感染的奇特功能,他的寿命就非常长。     

Effects of Various Degrees of Antennal Ablation on Mating and Oviposition Preferences of the Diamondback Moth,Plutella xylostella L.

Using scanning electron microscopy, we investigated the distribution of the trichoid, basiconic, and coeloconic sensilla on the antennae of the diamondback moth （DBM;Plutella xylostella）. The trichoid sensilla were the most abundant sensory organ, and the male moth antennae host signiifcantly more trichoid sensilla than female moth antennae. Conversely, basiconic and coeloconic sensilla were found more frequently on female than on male antennae. We performed experiments with various degrees of antennal ablation and demonstrated that DBM antennae played a key role in the control of mating and oviposition. We found that neither oviposition preference nor mating behaviors changed signiifcantly when less than 1/4 of both antennae were removed. However, there was a signiifcant behavioral change when the antennae were ablated by more than half. As the length of the antenna was shortened, the successful mating rate decreased and mating peak was delayed. An otherwise consistent host preference for oviposition was eliminated when both antennae were completely removed. Furthermore, we found that the number of trichoid sensilla was positively correlated with mating rate and oviposition preference. However, the numbers of basiconic and coeloconic sensilla were not correlated with mating rate and mating peak, but highly correlated with oviposition preference. Taken together, our results indicate that antennal sensory information plays a critical role in the mating and oviposition behaviors of this economically important pest.