仙人掌胭脂虫生物学特性的研究及室内毒力测定
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摘要
1.形态特征观察
     对胭脂虫的形态特征进行观察,结果显示:胭脂虫在生长发育过程中主要经过以下几个虫态,其中雌虫经过:卵、一龄若虫、二龄若虫及雌成虫4个虫态;雄虫经过:卵、一龄幼虫、二龄幼虫、前蛹、蛹及雄成虫6个虫态。雌成虫体卵形,体长2.3—3.5mm,触角7节,体密被白色棉状蜡丝,多个虫的蜡丝常融合在一起,形成棉球状,去蜡后虫体成紫红色。雄成虫体细长,比雌成虫小,约0.6—3.0mm,触角发育良好,念珠状,暗红色,有少许白色蜡粉。复眼红色,无口器,具一对前翅,后翅退化为平衡棒。腹部有两条白色的尾丝,约与身体等长。
     2.种类鉴定的研究
     通过对胭脂虫雌成虫虫体蜡腺的扫描电镜研究,结果表明:胭脂虫雌成虫蜡腺孔单个或成群,头部约25—30群,每群具有4—6孔,胸部约120—125群,每群约4—6孔,腹部约200群,每群多达30孔。腹部刚毛多且大,头部短而少,最后腹节刚毛短,圆柱状。胭脂虫雄虫触角的扫描电镜结果表明:雄虫触角上生有4种感器,即毛形感器、钟形感器、锥形感器及腔锥形感器。本试验鉴定该试验种为Dactylopiusconfusus(Cockerell)。
     3.自然生长环境下胭脂虫的生物学特性的观察
     自然环境条件下,胭脂虫一生需经过产卵、孵化、扩散、固定、泌蜡及发育六个生长阶段。刚孵化的若虫,具有群集习性,多数若虫常聚集在一起,爬到寄主仙人掌的顶端,寻找新的茎片,以汲取新的营养。该虫具有负趋光性,且通常会选择固定在寄主仙人掌茎的背阴面的刺基部或凹陷的地方,固定后便不再移动。
     4.胭脂虫在仙人掌植株上的分布及对仙人掌茎片的选择性研究
     通过在温室中随机选取寄生有胭脂虫的仙人掌植株上的胭脂虫调查,结果表明:胭脂虫最喜欢寄生在二级茎片上,其次是一级茎片,三级茎片上寄生的胭脂虫数量最少。胭脂虫主要寄生在仙人掌茎片的中部和基部。胭脂虫在向东的仙人掌茎片上寄生数量较多,占总寄生数量的72.6%,西部的仙人掌茎片上胭脂虫寄生数量较少,仅占寄生总数的27.4%。
     5.温度对胭脂虫生长发育的影响
     在21℃—33℃五个温度条件下饲养胭脂虫,研究温度对胭脂虫各龄期的存活率,胭脂虫成虫虫体大小、虫重和怀卵量及各虫态的发育历期的影响。结果显示:27℃胭脂虫各龄期的存活率最高,虫体长度、宽度、虫重最大,怀卵量最多,最适合胭脂虫存活。胭脂虫各虫态的发育历期随温度的上升发育历期缩短。从整个世代来看,胭脂虫的发育速率为33℃>30℃>27℃>24℃>21℃。在33℃条件下胭脂虫虽生长较快,但其成虫的大小、体重均较小,怀卵量也随之降低,因此胭脂虫适宜的温度范围可确定为24℃—30℃。
     6.胭脂虫生殖特性及越冬研究
     室内饲养条件下,通过对胭脂虫繁殖量的调查,结果表明:胭脂虫的繁殖量大,平均每头胭脂虫的繁殖量都在350头以上,最高达421头。温度是影响繁殖量的主要因素,湿度与繁殖量之间差异不显著。而通过对罩有网纱进行单雌饲养和不罩网纱雌雄自然种群混合饲养的两种处理的胭脂虫的怀卵量的解剖结果分析可知,胭脂虫的生殖方式是两性生殖,并且是通过产卵繁殖的,而不是卵胎生。
     在胭脂虫的越冬期间,对胭脂虫各虫态的数量调查,结果表明:在整个越冬期间均存在雌成虫和蛹态,但未发现雄成虫,且雌成虫和蛹的数量变化不太明显,确定胭脂虫的越冬虫态:雌成虫、卵和蛹。
     7.药剂对胭脂虫毒力测定
     五种药剂对胭脂虫一龄若虫、二龄若虫、雌成虫的毒力测定结果表明:这五种药剂对各虫态的毒力大小顺序一致。其中10%吡虫啉(大功臣)对胭脂虫各虫态的毒力最高,其它依次为36%马拉硫磷(全击)、48%毒死蜱(新一佳)、4.5%高效氯氰菊酯、1.8%阿维菌素的毒力最低。由五种药剂对胭脂虫一龄若虫和成虫的毒力比较结果显示,五种药剂对一龄若虫的毒力均明显高于二龄若虫和成虫,说明胭脂虫随着龄期的增大,其耐药程度也逐步提高,因此,应尽早防治。防治的最佳时期一般在若虫期,胭脂虫的若虫期在2月底3月初,在此时期防治效果较好,同时要注意各种药剂的合理轮用及混用,以延缓其抗药性的产生。
1.Shape characteristic observation
     Carries on the observation to Dactylopius Coccus Costa's shape characteristic,The results showed that:There were several instars among the growth of Dactylopius Coccus Costa,in which female process:Egg,the first instars,the second instars,and adult female; The male insect include:Egg,the first larva,the second larva,pre-pupa,pupa and adult male.The female prosopon body oval,body long 2.3-3.5mm,antenna 7,the body by the white cotton and kapok shape wax silk,many insect's wax silk often is fused densely in together,forms the cotton and kapok to be spherical,after the dewaxing the insect body becomes the purple red.The male prosopon body is tall and slender,is smaller than the female prosopon,0.6-3.0mm,the antenna growth is approximately good,reads beaded,the garnet,has the little white wax powder.The compound eyes are red,has no mouthparts, has a pair of anterior wing,the latter wing degeneration is a halter.The abdomen has two white tail silk,and so on is approximately long with the body.
     2.Species identification research
     Through female's body wax glands of the Dactylopius confusus(Cockerell)the scanning electron microscope research,the results showed that:Dactylopius confusus (Cockerell)female prosopon wax gland hole single or in groups,the forehead 25-30 crowd, each group has 4-6 approximately,the chest approximately 120-125 crowd,each crowd of 4-6,the abdomen approximately 200 crowds,each crowd reaches 30 approximately.The abdomen bristle are many and are big,the forehead is short and are few,the final abdominal segment bristle is short,circle columnar.The Dactylopius confusus(Cockerell) king antennas scanning electron microscope result indicated that:Four types of sensilla on the antenna of Dactylopius confusus(Cockerell),namely Trichoid sensilla,campaniform sensilla basiconic sensilla,styloconic sensilla.This experiment initially species identification is Dactylopius confusus(Cockerell).
     3.Under nature habitat Dactylopius confusus(Cockerell)'s biological characteristic observation
     Under the natural environment condition,Dactylopius confusus(Cockerell)life must pass through oviposit,incubate,the proliferation,fixed,secretes the wax and grows six growth stages.Just hatched nymphae's,had the aggregated habit,the most nymphaes often gathered in together,crawled to the host cactus's peak,sought the new stem piece, derived the new nutrition.This insect has hastens touches the habit and the negative ray, usually can choose fixes in the host cactus stem back shady-side thorn base or the concave place,after fixed then no longer moves.
     4.Distributed of Dactylopius eonfusus(Coekerell)quantity on different spot of cactus and to cactus stem piece selective research
     Through the stochastic selection parasitism has on Dactylopius confusus(Cockerell)'s cactus adult plant investigation in the greenhouse,finally indicated:The grain most likes parasiting on two level of stem pieces,next is the level stem piece,on three level of stem pieces parasites quantity are least.Dactylopius confusus(Cockerell)main parasitism in cactus stem piece under spot.The Dactylopius confusus(Cockerell)in parasites quantity to on the east cactus stem piece to be many,occupies always parasites quantity 72.6%,on the western cactus stem piece grain parasitism quantity are few,only accounts for the parasitic total 27.4%.
     5.The growth influence of the Dactylopius confusus(Cockerell) under temperature processing
     Raises the Dactylopius confusus(Cockerell)under 21℃-33℃five temperature conditions,the research temperature to the grain various stadiums survival percentage,it's body size,the insect heavy and the bosom egg quantity and various insects' condition growth experience time influence.Result demonstration:27℃the insects' various stadiums survival percentage is highest,insect body length and breadth,insect heavy biggest,cherishes the egg quantity to be most,most suits the grain survival.Various insects' condition growth experience time along with temperature rise growth experience time reduction.Looked from the entire generation,grain's growth speed for 33℃>30℃>27℃>24℃>21℃.The grain grows quickly although under 33℃the condition,but its prosopon's size,the body weight are small,cherish the egg quantity also to reduce along with it.
     6.Studies on the Dactylopius confusus(Cockerell)reproduction characteristic and survives in the winter
     In the room raises under the condition,through to the Dactylopius confusus (Cockerell)reproduction quantity investigation,finally indicated:Dactylopius confusus(Cockerell)'s quantity is big,the average each insect's reproduction quantity all above 350,high reaches 421 heads.The temperature is affects the reproduction quantity the primary factor,between the humidity and the reproduction quantity the difference is not remarkable.But through has the actor's wig to the cover and does not cover two kind of processing Dactylopius confusus(Cockerell)'s bosom egg quantity dissection result analysis which the actor's wig grows naturally to be possible to know,grain's reproduction way is the sexual reproduction,and is through spawns the hatching,but is not the viviparity.
     Survives the winter the period in the Dactylopius confusus(Cockerell),to the various insects' condition quantity investigation,finally indicated that,In entire survives the winter the period has the female prosopon and the cocoon condition also quantity change not too obvious,is surviving the winter the period had not discovered the male prosopon,the definite Dactylopius confusus(Cockerell)survives the winter the instar:The female is the female prosopon and the egg,the king is a cocoon.
     7.Medicament to Dactylopius confusus(Cockerell)toxicity mensuration
     Five medicament to Dactylopius confusus(Cockerell)1~(st)age nymphae,2_(nd)age nymphaes,the female prosopon's toxicity mensuration,the result indicated that,These five medicament are consistent to various insects' condition toxicity size order.10% Imidacloprid has the highest toxicity tovarious insects' instar,other are in turn 36% Cypemethrin,48%Chlopyrifos,4.5%Beta-cypermethrin,1.8%Avermectin toxicity is lowest.Demonstrated by five medicament to 1st age nymphae and prosopon's toxicity comparison result that,five medicament obviously are higher than 2~(nd)age nymphaes and the prosopon to 1~(st)age nymphae's toxicity,explained the Dactylopius confusus(Cockerell) along with stadium enlargement,it bears the medicine degree also gradually to enhance, therefore,should prevent and control as soon as possible.The preventing and controlling best time in the nymphae time,Dactylopius confusus(Cockerell)'s nymphae time in the end of February and at the beginning of March,is generally good in this time preventing and controlling effect,simultaneously must pay attention to each medicament to gather the theory with and mixes uses,delays its antibiotic production.
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