Search results for "Entomology"
showing 10 items of 351 documents
Microbial symbionts of parasitoids
2020
Parasitoids depend on other insects for the development of their offspring. Their eggs are laid in or on a host insect that is consumed during juvenile development. Parasitoids harbor a diversity of microbial symbionts including viruses, bacteria, and fungi. In contrast to symbionts of herbivorous and hematophagous insects, parasitoid symbionts do not provide nutrients. Instead, they are involved in parasitoid reproduction, suppression of host immune responses, and manipulation of the behavior of herbivorous hosts. Moreover, recent research has shown that parasitoid symbionts such as polydnaviruses may also influence plant-mediated interactions among members of plant-associated communities…
Grouping facilitates avoidance of parasites by fish
2013
Background. Parasite distribution is often highly heterogeneous, and intensity of infection depends, among other things, on how well hosts can avoid areas with a high concentration of parasites. We studied the role of fish behaviour in avoiding microhabitats with a high infection risk using Oncorhynchus mykiss and cercariae of Diplostomum pseudospathaceum as a model. Spatial distribution of parasites in experimental tanks was highly heterogeneous. We hypothesized that fish in groups are better at recognizing a parasitized area and avoiding it than solitary fish. Methods. Number of fish, either solitary or in groups of 5, was recorded in different compartments of a shuttle tank where fish co…
Synergism and Antagonism between Bacillus thuringiensis Vip3A and Cry1 Proteins in Heliothis virescens, Diatraea saccharalis and Spodoptera frugiperda
2014
Made available in DSpace on 2015-03-18T15:56:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-10-02Bitstream added on 2015-03-18T16:28:28Z : No. of bitstreams: 1 WOS000342591500006.pdf: 270331 bytes, checksum: c280e3f5bc5e3bb0b92bf74d046135f0 (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Spanish Ministry of Economy and Competivity FEDER Second generation Bt crops (insect resistant crops carrying Bacillus thuringiensis genes) combine more than one gene that codes for insecticidal proteins in the same plant to provide better control of agricultural pests. Some of the new combinations involve co-expression of cry and vip genes. Because Cry and Vip proteins …
Neonicotinoids from coated seeds toxic for honeydew-feeding biological control agents
2021
Seed coating (‘seed treatment’) is the leading delivery method of neonicotinoid insecticides in major crops such as soybean, wheat, cotton and maize. However, this prophylactic use of neonicotinoids is widely discussed from the standpoint of environmental costs. Growing soybean plants from neonicotinoid-coated seeds in field, we demonstrate that soybean aphids (Aphis glycines) survived the treatment, and excreted honeydew containing neonicotinoids. Biochemical analyses demonstrated that honeydew excreted by the soybean aphid contained substantial concentrations of neonicotinoids even one month after sowing of the crop. Consuming this honeydew reduced the longevity of two biological control …
Pētījumu reģistrācijas žurnāls: 1869, 1870, 1871
1871
Entomologa F. Sinteņa pašrocīgi veiktie pieraksti insektu kolekcijas veidošanas un pētījumu reģistrācijas žurnālā laikposmam no 1869. gada 3. augusta līdz 1871. gada 27. novembrim, Tērbatā.
Ein Beitrag zur Kenntnis der Aphidenfauna Lettlands
1928
Izvilkums no: Latvijas Universitātes raksti = Acta Universitatis Latviensis XVIII, 1928.
Festschrift zum 60. Geburtstage von Professor Dr. Embrik Strand [Festschrift zum sechzigsten Geburtstage von Professor Dr. Embrik Strand], Vol.5
1939
Jubilāram veltīti ārvalstu zoologu un paleontologu raksti.
Festschrift zum 60. Geburtstage von Professor Dr. Embrik Strand [Festschrift zum sechzigsten Geburtstage von Professor Dr. Embrik Strand], Vol.4
1938
Jubilāram veltīti ārvalstu zoologu un paleontologu raksti.
Festschrift zum 60. Geburtstage von Professor Dr. Embrik Strand [Festschrift zum sechzigsten Geburtstage von Professor Dr. Embrik Strand], Vol.1
1936
Jubilāram veltīti ārvalstu zoologu un paleontologu raksti vācu, franču, angļu, itāliešu u.c. valodās.
Festschrift zum 60. Geburtstage von Professor Dr. Embrik Strand [Festschrift zum sechzigsten Geburtstage von Professor Dr. Embrik Strand], Vol.3
1937
Jubilāram veltīti ārvalstu zoologu un paleontologu raksti vācu, franču, angļu, itāliešu u.c. valodās.