TRANSPORT AND KINETICS OF DIFLUBENZURON AND PYRIPROXYFEN IN THE BEET ARMYWORM SPODOPTERA-EXIGUA AND ITS PREDATOR PODISUS-MACULIVENTRIS
TRANSPORT AND KINETICS OF DIFLUBENZURON AND PYRIPROXYFEN IN THE BEET ARMYWORM SPODOPTERA-EXIGUA AND ITS PREDATOR PODISUS-MACULIVENTRIS
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DOI：
10.1007/bf02383217
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发表时间：
1995-08-01
影响因子：
1.9
通讯作者：
DEGHEELE, D
中科院分区：
文献类型：
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作者：
DECLERCQ, P;VINUELA, E;DEGHEELE, D
研究了昆虫生长调节剂氟虫脲和吡虫腈在甜菜夜蛾（Spodoptera exigua, Hubner）幼虫和黄斑足蝽（Podisus maculiventris, Say）若虫体内的转运和滞留。在第一个实验中，研究了口服[C-14]放射性标记同位素的两种化合物在甜菜粘虫五龄幼虫中的保留情况。两种IGRs的排泄率均较高，摄入后约6 h即可排出50%。在第二个实验中，研究了化合物从猎物到捕食者的运输以及它们在捕食者体内的保留。maculventris五龄若虫被允许以喂食了被污染食物的毛虫为食。对于双氟苯脲和吡丙醚，80%以上的放射性标签在被消耗的猎物中被回收。在被捕食的幼虫受到捕食性臭虫攻击时所吐出的液体中也发现了低水平的放射性（约为放射性标签施用量的3%）。在以甜菜粘虫毛虫为食时，maculiventris线虫若虫摄入了相对少量的放射性标签（分别为口服给猎物的氟虫脲和吡丙醚用量的8%和15%）。数据表明，捕食者并不以肠道内容物为食物。在不同化合物之间，黄斑室虫若虫的排泄模式不同。对于氟虫脲，在前6小时内，捕食者体内的放射性急剧下降约40%，然后在72小时内，放射性残留水平稳定在3-4%。对于吡丙醚，观察到体内放射性缓慢下降，72小时时仅检测到施用量的2%。本研究的结果与以往关于这两种IGRs对黄斑孢杆菌毒性的研究结果进行了讨论。
Transport and retention of the insect growth regulators (IGRs) diflubenzuron and pyriproxyfen in larvae of the beet armyworm Spodoptera exigua (Hubner) and in nymphs of the predatory bug Podisus maculiventris (Say) were investigated. In a first experiment, the retention of orally administered [C-14]radiolabeled isotopes of both compounds in fifth-instar larvae of the beet armyworm was studied. Rate of excretion of both IGRs in S. exigua caterpillars was high, with a 50% excretion time of approximately 6 h after intake. In a second experiment, the transport of the compounds from prey to predator and their retention inside the predator were studied. Fifth-instar nymphs of P. maculiventris were allowed to feed on caterpillars that had been given contaminated food. For both diflubenzuron and pyriproxyfen, more than 80% of the amount of radiolabel applied was recovered in consumed prey. Low levels of radioactivity (c. 3% of the applied amount of radiolabel) were also found in the fluid regurgitated by the prey larvae when attacked by the predatory bugs. Relatively small amounts of radiolabel (c. 8 and 15% of the amount orally applied to the prey for diflubenzuron and pyriproxyfen, respectively) were ingested by P. maculiventris nymphs when feeding on beet armyworm caterpillars. The data suggest that the predators did not use gut content as food. The pattern of excretion in nymphs of P. maculiventris ris differed between compounds. For diflubenzuron, there was a drastic decrease of radioactivity inside the predator body of around 40% within the first 6 h and then the level of retained radiolabel remained stable at 3-4% up to 72 h. For pyriproxyfen, a slow decrease of radioactivity inside the body was observed and at 72 h only 2% of the applied quantity was detected. Results of this study are discussed in relation to the findings from previous studies on the toxicity of both IGRs to P. maculiventris.