Phenology and abundance of bean leaf beetles, Cerotoma trifurcata (Förster), were examined throughout two eastern South Dakota growing seasons in relation to grain yields in chisel- and ridge-tilled soybeans [Glycine max (L.) Merrill] grown in 2-yr rotation with corn (Zea mays L.) with and without added nitrogen (N). Populations were also sampled early and late season in alfalfa (Medicago sativ...

Tree-killing bark beetles are major disturbance agents affecting coniferous forest ecosystems. The role of environmental conditions on driving beetle outbreaks is becoming increasingly important as global climatic change alters environmental factors, such as drought stress, that, in turn, govern tree resistance. Furthermore, dynamics between beetles and trees are highly nonlinear, due to comple...

Purpose: To investigate the chemical composition and toxicity of the essential oil of Glycosmis parviflora (Sims) Little aerial parts against root-knot nematode and two grain storage insects (maize weevil and red flour beetle). Methods: Steam distillation of G. parviflora was carried out using Clavenger apparatus in order to extract its volatile oil. Gas chromatography/mass spectrometric (GC/MS...

This research tested the suppressive ability of Beauveria bassiana (Balsamo) Vuillemin alone and in combination with diatomaceous earth against the red flour beetle, Tribolium castaneum (Herbst). Adults did not show a dose response to B. bassiana, and the addition of diatomaceous earth (DE) did not result in a significant increase in mortality. Against larvae, however, DE at 190 mg/kg grain enh...

The accuracy of near-infrared spectroscopy (NIRS) for predicting the chronological age of adults of the rice weevil, Sitophilus oryzae (L.); the lesser grain borer, Rhyzopertha dominica (F.); and the red flour beetle, Tribolium castaneum (Herbst), three pests of stored grain, was examined. NIRS-predicted age correlated well with actual age of these three species. Age predictions in S. oryzae by...

Abstract Khapra beetle, Trogoderma granarium Everts, 1898 (Coleoptera: Dermestidae) is one of the most notorious pests stored grains. This study was aimed to evaluate efficacy ozone against 2nd and 5th instars adults T. in wheat kernels under laboratory conditions. Four concentrations 300, 600, 900, 1200 parts per million by volume (ppmv) were used. The results revealed that LC 50 values 249.76...

field collection in nahavand county (hamedan province, iran) revealed 9 blister beetle (col: meloidae) species from three different tribes of subfamily meloinae. in tribe mylabrini, mylabris impressa chevrolat 1837, mylabris schreibersi reiche 1865, mylabris variabilis (pallas, 1781), mylabris guerini chevrolat 1837, lydoceras bilineatus thomas 1897 and croscherichia spp. pardo alcaide identifi...

Population studies of grass grub and black beetle have revealed simple patterns of population determination. Populations fluctuate in response to variations in soil moisture and temperature. The upper limit to population growth is set by density dependent factors (larval mortality of grass grub and variation in natality of black beetle). Parasites and predators appear to be generally unimportan...

In the present work, we examined the insecticidal effect of spinosad, against adults of the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae), the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae), the confused flour beetle, Tribolium confusum Jacquelin du Val (Coleoptera: Tenebrionidae) on wheat and the larger grain borer, Prostephanus truncatus (Horn) (Col...