The parasitized dbm larvae had prolonged their 4th instar duration obviously , and the later the larva had been parasitized , the longer this extended duration became 小菜蛾幼虫被寄生后，其4龄发育历期较未被寄生的显著长，且寄生时龄期越大4龄历期延长越多。
The daily maximum number of m . avenae preyed theoretically by the first , second and third instar larva of e . balteatus are 5 . 13 , 26 . 00 and 119 . 26 aphids respectively . 2 黑带食蚜蝇1龄、 2龄和3龄幼虫对麦长管蚜的日最大捕食量分别为5 . 13头、 26 . 00头和119 . 26头。
The functional response of the first , second and third instar larvae of e . balteatus preying on macrosiphum avenae ( f . ) show the rolling ii type with better fitting 黑带食蚜蝇各龄幼虫对麦长管蚜macrosiphumavenae ( f . )的捕食功能反应用holling ?型和新holling ?型功能反应模型拟合均较好。
There are mutual interference among the third instar larvae of episyrphus balteatus de geer , and the searching efficiency decreases and the intensity of scrambling competition increases with increase of its density 黑带食蚜蝇3龄幼虫存在着种内干扰，其寻找效应随着自身密度的增加而降低，其分摊竞争强度随着自身密度的增加而增加。
As a consequense of eutrophication , chironomid larvae excessively propagates in water sources , such as reservoir and fresh lake , which induced the 1st instar larvae of chironomid in source water to enter drinking water treatment system 水体富营养化使得摇蚊幼虫在水库、湖泊类水源中大量孳生繁殖,直接导致其可以在给水处理系统中出现。
The best searching densities of the first , second and third instar larva of e . balteatus are 6 . 73 , 10 . 09 and 44 . 03 aphids respectively . 3 . the predation ratio of e . balteatus is the lowest at 14 ? and the predation ratio at 18 c , 22 c , 26 c and 30 c are not different 黑带食蚜蝇1龄、 2龄和3龄幼虫对麦长管蚜的最佳寻找密度分别为6 . 73头、 10 . 09头、 44 . 03头，这对田间利用黑带食蚜蝇幼虫防治麦长管蚜有一定参考价值。
Female lays its eggs hi mid - june and eggs will hatch in 20 days , larvae feeding on aristolochia kaempferi from late june to mid - september ( about 50 - 55 days ) , five instars . from mid - august , larvae become pupae in tree branches or brushes with changeable color based on background 幼虫期从六月下旬到九月中旬，幼虫五龄，历期50 - 55天，取食异叶马兜铃，八月中旬开始老熟幼虫在灌木、树枝上化蛹，蛹的颜色随化蛹时背景颜色变化，九月上旬为化蛹盛期。
On the basis of foreign documents , the dissertation firstly describes the morphology , taxonomy , and biological characters of cochineal insects . then , by using artificial climate cases in the lab , according to orthogonal design , 8 lands of combinations of temperature , humidity and light is set , while the temperature has four levels : 15 , 20 , 25 and 30 , and the relative humidity has two levels : 60 % and 80 % , while the light also has two levels : 980 lux and 60 lux . through observations and analysis of hatching percentage , survival percentage of the first instar and during from the second instar to the adult , the population tendency index , generation life cycle , size and eggs of female adult , the development of the cochineal under different conditions is studied 在收集、整理国外对胭脂虫的研究资料基础上，首先从胭脂虫的形态学、分类学、生物学特性入手，进而在实验室内利用人工气候箱，应用正交设计方法，设计了4种温度、 2种湿度、 2种光照梯度的不同组合，通过测定胭脂虫的孵化率、 1龄若虫的存活率、 2龄若虫至成虫期存活率、种群趋势指数、世代历期、雌成虫的大小、怀卵量等生物学指标，深入研究胭脂虫在这些组合下的生长发育状况，应用数理统计方法，分析出温度、湿度和光照对各项生物学指标的影响，找出胭脂虫适宜的室内培育条件，并为野外胭脂虫的培育提供一定的理论依据。
In the laboratory when the first - instar larvae , third - instar larvae , and fifth - instar larvae of cotton bollworm fet with all kinds of tissues of transgenic bt cotton , the result showed that transgenic bt cotton can easily cause death to low - instar larvae and this effect deteriorates on high - instar larvae 转bt基因棉对棉铃虫幼虫的行为活动有较大的影响，表现为取食时间明显减少，静息、吐丝下垂和爬行时间明显延长。棉铃虫幼虫取食转bt基因棉后，发育速度的减慢导致其生育期的延长。
In the experiment , the first instar housefly larvae " metallothionein mrna expressing reach maximur . after induced by cd ( 2mm ) for 48 hours , then total rna was extracted with guanidinium isothiocyanate , and mrna was isolated by the polyattract mrna isolation systems surplied by promega company 试验中采用2mmcd ~ 2对家蝇初孵幼虫诱导48小时，使其体内金属硫蛋白mrna表达达到高峰，在液氮中将其研磨成粉末后采用异硫氰酸胍法提取总rna ，再用promega公司提供的小量分离mrna试剂盒纯化mrna 。
