Abstract
Lasioderma serricorne, also known as cigarette beetle, can exploit a wide variety of stored materials as foods, but it is particularly common on tobacco and herbs. This beetle is a dominant pest species of stored Chinese medicinal materials (CMMs) causing high economic damages, making effective control strategies urgently needed. Behavioural manipulation is an important component of Integrated Pest Management. To the best of our knowledge, plant-borne volatile organic compounds (VOCs) have never been explored to develop lures for managing L. serricorne. In this study, the behavioural responses of L. serricorne to VOCs from four selected CMMs (Euphorbia kansui, Aconitum carmichaelii, Eucommia ulmoides and Pinellia ternata) were studied and their components analysed. Then, the olfactory responses of L. serricorne to the most abundant VOC identified in the preferred CMM, i.e., paeonal, was tested. L. serricorne showed significant differences in its preferences for the VOCs from the four CMMs, i.e, E. kansui > A. carmichaelii > E. ulmoides > P. ternata. From the VOCs of E. kansui, A. carmichaelii, E. ulmoides, and P. ternata, 77, 74, 56, and 81 molecules, were identified, respectively. Paeonal (23.5%), junipene (17.2%), hexanal (17.1%), and benzeneacetonitrile (14.0%) were the most abundant, respectively. Since paeonal dominated the VOC spectrum of the most preferred CMM, this compound was selected for further studies. L. serricorne showed significant positive responses to paeonal tested at various doses, with the most attractive ones being 100 μg and 500 μg. Our findings shed light on the olfactory cues routing the food searching behaviour in the cigarette beetle, providing important information on how L. serricorne targets particular CMMs. The high attractiveness of paeonal at low doses tested here may be exploited further to develop novel monitoring and control tools (e.g., lure-and-kill strategies) against this important stored product pest.
Highlights
The cigarette beetle, Lasioderma serricorne Fabricius (Coleoptera: Anobiidae), was first reported on tobacco in France in 18481
When L. serricorne were tested for their relative preferences between the two arms of the Y-tube olfactometer linked to chambers with clean air (CA), there was no bias in a series of 24 experiments; 12 beetles chose each arm
In Y-tube olfactometer bioassays, L. serricorne adults were strongly attracted by volatile organic compounds (VOCs) emitted by all Chinese medicinal materials (CMMs) tested in this study, suggesting a strong plasticity of the insect olfactory system in locating suitable food sources
Summary
The cigarette beetle, Lasioderma serricorne Fabricius (Coleoptera: Anobiidae), was first reported on tobacco in France in 18481. It is especially injurious to stored tobacco[7] Pesticides, such as phosphine, have been widely used against insects on stored products for more than 100 years, but some serious negative issues, including insecticide resistance and lethal effects on non-target organisms, www.nature.com/scientificreports/. Various repellents and attractants, which have functional components derived from specific plants, have been applied to manipulate insect behaviour, effectively protecting stored products from pest infestation[14,21,22]. It is reasonable to attempt developing effective attractants or repellents based on the components of mixtures of volatile organic compounds (VOCs) from specific stored products, which could be used for the management or behavioural manipulation of stored-product pests
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