This is the first study on the distribution and occurrence of Helicosporidium sp. in the populations of the great spruce bark beetle Dendroctonus micans (Coleoptera: Curculionidae, Scolytinae) from different localities. Two hundred and eight of 2300 examined beetles were infected by Helicosporidium sp. In total infection rate was 9.04%. The infection reached 71.7%. The prevalence of Helicospori...

Regurgitant from leaf-feeding beetles (Cerotoma trifurcata, Epilachna varivestis and Diabrotica undecimpunctata) contains RNase activity equivalent to 0.1 to 1 mg/ml pancreatic RNase. When mixtures of pancreatic RNase at 0-1 to 1-0 mg/ml and viruses that are or are not transmissible by beetles, were inoculated to plants using the gross wounding technique, those containing viruses not transmissi...

Cochabambia Marcuzzi (1985) (Coleoptera: Tenebrionidae) is a junior homonym of Cochabambia Pirán, 1959 (Hemiptera: Heteroptera: Acanthosomatidae). Allotriocochabambia is proposed as a new name for the tenebrionid genus, and as result Allotriocochabambia kulzeri (1985) is proposed as new combination. The placement of Cochabambia Pirán within the Acanthosomatidae is discussed. 

The tribe Eschatoporini Blaisdell, 1906 is reinstated, based on molecular and morphological data, and the spelling corrected as Eschatoporiini. The tribe currently includes only the cave-dwelling genus Eschatoporis Blaisdell, 1906 from California, which is associated with underground aquifers. A second species of Eschatoporis is described from a cave in Napa County, California. The phylogenetic...

The area of wooded pasture in Europe has decreased drastically over the last centuries due to abandoned management. Herrevadskloster is a newly formed nature reserve in northern Scania with an unusually long continuity of being an open, grazed woodland containing large old trees. In this study, the reserve was studied to evaluate its potential to further the conservation of the redlisted saprox...

We combined two protein-marking enzyme-linked immunosorbent assays (ELISA) with a predator gut content ELISA to monitor the movement and feeding activity of commercially-purchased Hippodamia convergens Guèrin-Mèneville (Coleoptera: Coccinellidae) under realistic field conditions during two field seasons in central Arizona. The proteinmarking ELISAs were used to differentiate released H. converg...

The aim of the research was to determine the occurrence of insect’s pathogens and nematodes in Orthotomicus laricis (F.), Orthotomicus erosus (Wollaston), and Orthotomicus nobilis (Wollaston) in central-south Europe. We found three insect’s pathogens Chytridiopsis sp., Gregarina sp., Mattesia sp. and nonspecific gut nematodes and nematodes in the haemolymph, where adult nematodes were identifie...

A suite of commercially available volatile compounds was tested in an olfactometer bioassay for responses by the crucifer flea beetle (Phyllotreta cruciferae). Flea beetles were inhibited by exposure to hexane, pentane, and ethanol. Allyl-isothiocyanate, a crucifer-specific volatile, was moderately attractive to spring and early fall flea beetles, but inhibitory to late fall flea beetles. Sprin...

Biogenic amines perform many kinds of important physiological functions in the central nervous system (CNS) of insects, acting as neuromodulators, neurotransmitters, and neurohormones. The five most abundant types of biogenic amines in invertebrates are dopamine, histamine, serotonin, tyramine, and octopamine (OA). However, in beetles, an important group of model and pest insects, the role of t...

These experiments determined the magnitude of loads that rhinoceros beetles (Scarabaeidae) can carry and also the metabolic energy required for carrying loads. I hypothesized that, like many other animals, these beetles would have metabolic rates in direct proportion to the total load (body mass plus added mass). Eight beetles (Xylorctes thestalus) walked at 1 cm s-1 on a motorized treadmill en...