Infestation

About: Infestation is a research topic. Over the lifetime, 8308 publications have been published within this topic receiving 82305 citations.

Incidence and Effects of Cuterebra in Peromyscus

Abstract: Peromyscus leucopus is the favored host for Cuterebra angustifrons on the AEC Reservation near Oak Ridge, Tennessee. Feromyscus nuttalli is a host of C. angustifrons also, but no other cricetid (5 species, > 4000 captures) was infested. Percentages of infestation in P. leucopus during 1958–1964 ranged from 19 to 33% per year; the overall average per year was 25%. In general, the infestation period in P. leucopus is June–December, the greatest percentages occurring in summer. Infested mice were found in certain nonforested areas, as well as in forested areas. Eighty-one per cent of the mice carried one bot, 16% had two bots and 3% had three bots; 87% of the larvae were located in the inguinal region. There was no difference in percentage of infestation between sexes. Erythrocyte count, hematocrit percentage and hemoglobin concentration were consistently lower in infested mice, and total leucocyte number was greater. The infestation period for P. leucopus in this area is about 3 months longer than in southern Canada and northern U. S. Consequently, hematological effects caused by Cuterebra myiasis are present for a considerably longer time in P. leucopus populations in this area than in the areas farther north.

Life cycle of the pea crab pinnotheres halingi sp. Nov., an obligate symbiont of the sea cucumber holothuria scabra jaeger

Abstract: A new species of pea crab, Pinnotheres halingi sp. nov. (Pinnotheridae), found encysted in the right respiratory tree of the sea cucumber, Holothuria scabra (Holothuridea), from Solomon Islands, is described. The reproduction, infestation and pairing behaviour of the crabs were investigated through field observations and experiments. Infestation frequency in 8 monthly samplings of 25–30 holothurians was 98.6±2.6% in Kogu Halingi bay and 0% in two nearby sites. Of 403 pea crabs, 91.4% were found in pairs of opposite sex, 7.9% were single females and <1% were single males. The embryos developed on the female pleopods over ca. 30 days from fertilisation to the release of first zoeae and subsequently went through five pelagic zoeal stages. Infestation occurred at the megalops stage after about 59 days of development. A single pea crab (male or female) per host was found three months after larval infestation. Young males appeared to be strongly attracted to hosts that sheltered a single female, sugges...

Down-regulating gene expression in insect pests

Abstract: The present invention relates to genetic control of infestation by insect pest species, particularly prevention and/or control of pest infestation of plants, using interfering ribonucleic acid (RNA) molecules. Compositions and combinations containing the interfering RNA molecules of the invention for use in topical applications, for example in the form of insecticides.

Molecular and biochemical markers of some Vicia faba L. genotypes in response to storage insect pests infestation

Abstract: Storage insect pests cause serious losses to all legume crops in both quality and quantity. This study was conducted to study some morphological characters and biochemical components in eight genotypes of faba bean to determine biochemical and molecular markers for resistance and susceptibility to infestation with stored insects. The results showed that chlorophyll content in leaves, phenol, tannin, peroxidase (POD), polyphenol oxidase (PPO), and protein content in leaves and seeds of faba bean plants either significantly or non significantly increased the effect of insect infestation in the resistance genotypes (L.551, L.512, L.153, NA112, and L.1) as compared with the susceptible genotypes (L.16 and T.W). Protein electrophoresis showed a wide variation between genotypes and determined some biochemical markers (sodium dodecyl sulfate poly acrylamide gel electrophoresis, SDS-PAGE). In addition, molecular genetic markers for stored insects' resistance were obtained using inter-simple sequence repeat polyme...