[学术文献] A Nucleopolyhedrovirus from the Mediterranean flour moth, Ephestia kuehniella (Lepidoptera: Pyralidae) 进入全文
Applied Entomology and Zoology 期刊
In the present study, a Nucleopolyhedrovirus (NPV) was isolated from laboratory-reared larva of the Mediterranean flour moth, Ephestia kuehniella Zeller (Lepidoptera: Pyralidae). Under the light microscope, high numbers of polyhedral inclusion bodies (PIBs) formed by the virus were found in hemolymph, tracheae, and the midgut. The PIBs measured 1.97 ± 0.46 (1–3.04) µm (n = 50). In cross-sections of PIBs, the virions contain a high number of nucleocapsids (1–28), and the viral particles were 190–270 × 30–40 nm. Some diamond-shaped inclusion bodies, like spindles, which did not include virions, were also observed. This virus was isolated and characterized for the first time from E. kuehniella.
Annals of the Entomological Society of America 年鉴
Oviposition behavior of seven Dalbulus species was studied in the laboratory on six-leaf stage maize, Zea mays L. The location of each egg was recorded for leaf or sheath, basal or apical half of each leaf, upper (adaxia) or lower (abaxial) leaf surface, and on or off midrib. Also determined was whether eggs were clustered or not. The leafhoppers were separated into three distinct groups: 1) D. elimatus (Ball), D. guevarai DeLong, and D. longulus, DeLong; 2) D. quinquenotatus DeLong & Nault and D. madis (DeLong & Wolcott); 3) D. tripsacoides DeLong & Nault and D.gelbus DeLong. Egg placement by Dalbulus leafhoppers is discussed in terms of their geographical distribution, habitat preference, and interspecific competition. Oviposition behavior closely agrees with a phylogeny of the genus based on morphology.
[学术文献] Ovipositional and feeding preference of leafhoppers [Empoasca fabae] (Homoptera: Cicadellidae) on Clark soybeans in relation to plant pubescence 进入全文
Journal of the Kansas Entomological Society 期刊
Ovipositional preference of the potato leafhopper, Empoasca fabae (Harris), was determined on eight isolines (pubescent types) of Clark soybeans. In field tests, counts of all leafhoppers on the isolines were used as an index of feeding preference; the glabrous and curled deciduous lines had the highest number of leafhoppers and the dense type the fewest number of leafhoppers. In greenhouse tests, the glabrous line received a significantly greater number of eggs than the other lines, but the curled deciduous line was also highly preferred for oviposition. The dense pubescent soybean line received the least number of eggs.
World Tea News 网站
Tealet is a Las Vegas-based tea wholesaler and tearoom that prioritizes transparency in its tea sourcing. Founder Elyse Petersen, who has a background as a food scientist and worked in the food industry doing product development, quality control, and FDA compliance, formed Tealet to connect tea farmers with tea businesses and makes transparency central to her business model. In 2012, she founded Tealet to import teas into the American market. Her goal is to find the biggest wholesale market for tea farmers, distributors and teahouse owners who want to buy fully transparent direct trade tea. “It’s a new concept of collaborative consumption,” said Petersen, who has met all of the farmers whose tea she imports. She feels the demand for transparency is what has bolstered her business’s success. Tealet has sold more than 800 teas, many of which are seasonal.
[科技报告] NTP TECHNICAL REPORT ON THE TOXICOLOGY STUDIES OF GREEN TEA EXTRACT IN F344/NTac RATS AND B6C3F1/N MICE AND TOXICOLOGY AND CARCINOGENESIS STUDIES OF GREEN TEA EXTRACT IN WISTAR HAN[Crl:WI(Han)] RATS AND B6C3F1/N MICE (GAVAGE STUDIES) 进入全文
[学术文献] Effects of habitat type and spatial scale on density dependent parasitism in Anagrus parasitoids of leafhopper eggs 进入全文
Biological Control 期刊
The ability of parasitoids to maintain a high rate of parasitism under varying conditions is considered crucial to their ability to control the populations of their hosts. Here, I tested parasitism rate by Anagrus parasitoids and its dependency on the density of Erythroneura leafhopper eggs at two spatial scales (leaf and field) and two habitat types (natural vs. agricultural). The rate of parasitism differed among field sites, increased across the season, and was similar in natural and agricultural sites. At the leaf scale, the rate of parasitism was density-independent or inversely density-dependent, consistent with a weak aggregation of parasitoids on leaves with high host densities and with limited oviposition-rate or egg supply. At the field scale, in contrast, parasitism rate was positively dependent on host density, which may be explained by demographic processes, such as higher recruitment and higher fecundities of females in host-rich field sites. Overall, the results demonstrate that parasitism patterns are highly dynamic in time and space and depend on the scale of observation.