Respiratory failures in adult colorado potato beetles evoked by neem preparation
2001
Kuusik, A. | Hiiesaar, K. | Metspalu, L. | Hermann, P. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Plant Protection)
The influence of neem preparation (NeemAzal TS) on the brething mode in the adults of Colorado potato beetle, Leptinotarsa decemlineata (Say), was studied by means of a respirometer-actograph and an infra-red gas analyzer. Both respirometry were combined with an infra-red optical system allowing to record external gas exchange cycles, standard metabolic rate (SMR), and respiratory movements simultaneously. The beetles treated with nonlethal doses of neem lost their ordinary and regular discontinuous gas exchange cycles (DGCs) - the release of carbon dioxide by discrete bursts and abrupt air intakes into tracheae. The DGCs in treated beetles did not restore after the recovering of the beetles from the mild poisoning. Nevertheless, at low temperatures between 5 and 8 deg C the treated beetles displayed the typical irregular microcycles of gas exchange. Authors suggest that the respiratory failures were not due to the paralyzing of the spiracles by neem, but affected were rather the neuromuscular, humoral and neuro-hormonal centers involved in the regulation of the external cyclic gas exchange
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