Instituto de Investigación Y Ingeniería Ambiental (IIIA), CONICET-UNSAM, Universidad Nacional de San Martín, Buenos Aires, Argentina.
Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina.
Neotrop Entomol. 2022 Apr;51(2):221-229. doi: 10.1007/s13744-021-00937-4. Epub 2022 Jan 5.
Many authors report biological differences among insecticide-resistant pest species, mainly associated with parameters of life history, but only a few studies approach differences at the behavioural level. Feeding behaviour in Blattella germanica (L.) is modulated by the detection of chemical volatiles emitted from food sources in order to be located a long-median distance, and also by the physicochemical properties of food. This work aimed to study the differences in the feeding behaviour of a susceptible and a pyrethroid-resistant strain of B. germanica, in the location and exploitation of a food source. Resistant males showed a lower performance in the feeding behaviour compared to susceptible males. Particularly, the time taken to locate the source was significantly higher in the resistant individuals, suggesting a lower capacity in the detection of food odours. In addition, although the Intake rate was negatively related to the stiffness of food for both strains, resistant individuals showed a lower intake rate compared to susceptible ones, when exploiting a food source of the same stiffness. In a control context, the phenotypic characteristics associated to feeding of pyrethroid-resistant individuals could induce a behavioural resistance mechanism caused by a reduction in the amount of toxic gel bait ingested. If that is the case, resistance of this strain would not be associated to physiological changes affecting the toxicity of the active principle of gel baits, but to a lower efficacy of these products against resistant individuals due to less amount of gel consumed, generating control problems of this pest.
许多作者报告了抗杀虫剂害虫物种之间的生物学差异，主要与生活史参数有关，但只有少数研究涉及行为水平的差异。德国小蠊的取食行为受到来自食物源的化学挥发物的探测调节，以便在较长的中值距离内定位，同时也受到食物的物理化学性质的调节。本工作旨在研究敏感和拟除虫菊酯抗性德国小蠊品系在定位和利用食物源方面取食行为的差异。抗性雄性在取食行为方面的表现明显低于敏感雄性。特别是，抗性个体找到食物源的时间明显更长，这表明它们对食物气味的探测能力较低。此外，尽管对于两种品系，摄入率与食物的硬度呈负相关，但在利用相同硬度的食物源时，抗性个体的摄入率明显低于敏感个体。在对照条件下，与拟除虫菊酯抗性个体取食相关的表型特征可能会导致由于摄入的毒胶饵量减少而产生行为抗性机制。如果是这样，那么这种品系的抗性就不会与影响胶饵有效成分毒性的生理变化有关，而是与这些产品对抗性个体的效果降低有关，因为消耗的胶饵量较少，从而产生这种害虫的控制问题。
