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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Vatiga spp. associadas à mandioca e morfologia e biologia de V. illudens em diferentes genótipos da cultura / Vatiga spp. Associated of the cassava and V. illudens morphology and biology in diferents genotypes of the culture

Wengrat, Ana Paula Gonçalves da Silva 26 August 2016 (has links)
Made available in DSpace on 2017-07-10T17:37:22Z (GMT). No. of bitstreams: 1 Ana_Paula_G_S_Wengrat.pdf: 2096466 bytes, checksum: eab7f1fa4bfc4b23b72f4b2bcd8697d8 (MD5) Previous issue date: 2016-08-26 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Species of Vatiga (Hemiptera: Tingidae) are pests of Cassava, Manihot esculenta Crantz (Euphorbiaceae), an important food source for more than 800 million people. Vatiga infestations in Cassava can cause serious production losses. Although importance economic, there are few research work about morphological description this species, relevant item in pest identification at the beginning of infestation and for use in phylogenetic analysis. Furthermore, not many records occur of Vatiga species and resistant genotypes to prague. That way, has been described and illustred the external morphology all the phases of V. illudens life, evaluated at resistance of five genotypes of cassava at this species and raising the occurence of insects of the genus Vatiga in Cassava comercial crops. About morphology, the eggs´s whitish, oblong-shaped and deposited inside of leaf. Nymphs, the dorsal surface of the head and body side margins have spikes; from the second to fifth instar the cephalic and lateral spikes become more visible, but in least amount that V. manihotae. Genotypic resistance showed that insects supplied Mecu 72 genotype had affected their development, thereby increasing nymphal and eggs-adults period, reducing significantly the fertility. The occurrence of the species recorded four species of Vatiga / As espécies de Vatiga (Hemiptera: Tingidae) são pragas da cultura da mandioca, Manihot esculenta Crantz (Euphorbiaceae), uma importante fonte de alimento para mais de 800 milhões de pessoas. Infestações de Vatiga em mandioca podem causar graves perdas de produtividade. Embora apresente importância econômica, são raros os trabalhos de descrição morfológica desta espécie, ítem relevante na identificação da praga já no inicio das infestações e para utilização em análises filogenéticas. Além disso, são escassos os registros de ocorrência das espécies de Vatiga e de genótipos resistentes à praga. Assim, foi descrita e ilustrada a morfologia externa de todas as fases de vida de V. illudens, avaliada a resistência de cinco genótipos de mandioca a esta espécie e levantada a ocorrência das espécies do gênero Vatiga em cultivos comerciais de mandioca. Acerca da morfologia, os ovos são esbranquiçados, oblongos e depositados no interior do tecido vegetal. Nas ninfas, a superfície dorsal da cabeça e margens laterais do corpo apresentam espinhos; a partir do segundo ao quinto ínstar os espinhos cefálicos e laterais tornam-se mais visíveis porém, em menor quantidade em relação à V. manihotae. Verificou-se que os insetos alimentados com o genótipo Mecu 72 tiveram seu desenvolvimento afetado, aumentando o período ninfal e de ovo-adulto e reduzindo significativamente a fecundidade. A ocorrência das espécies registrou quatro espécies de Vatiga
2

Morfologie křídelní nervatury larválních stádií Palaeodictyoptera ze svrchního karbonu Polska / Palaeodictyoptera: morphology of immature wings from the Upper Carboniferous of Poland

Tippeltová, Zuzana January 2013 (has links)
Insect wings are very specific and unique structures in animal kingdom. Wing morphology is a result of long-standing complicated evolutionary process and until recently the way how the wings have evolved is not completely clarified. The flight ability is one of the most important event in insect history because it allows them to exploit new habitats, escape from predators or find the sexual partner. Here we present the newly discovered material consisting of Palaeodictyoptera immature wings from the Upper Carboniferous (Westphalian A) of Poland. This order became extinct in the end of Permian, however during the Late Paleozoic was remarkably diversified. Until recently, number of adult palaeodictyopterans have been described, however the immature stages are relatively unknown due to lack of suitable fossils. Immature wings present in this thesis have undoubtedly palaeodictyopterous affinities with atribution within superfamilies Breyeroidea and Homoiopteroidea. However, their familial assignment into Breyeriidae (morphotype A) and Homiopteridae (morphotype B) based on fore wing venation characters is not definite because of wing venation limits in early ontogenetic stages. The aim of the present work is a complex description of 14 new palaeodictyopteriids immature wings, and to point out certain important...
3

Aspectos bioecológicos e potencial de parasitismo de Encarsia formosa (Gahan) (Hymenoptera: Aphelinidae) sobre Bemisia tabaci biótipo B(Gennadius) (Hemiptera: Aleyrodidae) em couve tomate e soja. / Biological aspects and parasitism potencial of Encarsia formosa (Gahan) (Hymenoptera: Aphelinidae) under Bemisia tabaci BIOTYPE B (Gennadius) (Hemiptera: Aleyrodidae).

Takahashi, Karina Manami 29 April 2005 (has links)
O presente trabalho teve por objetivo avaliar o potencial de parasitismo e eficiência de E. formosa sobre B. tabaci biótipo B em couve, tomate e soja. O tempo de desenvolvimento de ovo a adulto e o número de ninfas de B. tabaci biótipo B foram avaliados em soja, tomate e couve. O número de ninfas parasitadas diariamente e o número total de ninfas parasitadas por fêmeas de E. formosa até sua morte foram avaliados para determinar a capacidade de parasitismo do parasitóide. Foram realizadas liberações de números variáveis de E. formosa para um número fixo de ninfas de B. tabaci biótipo B para avaliar o número ideal de parasitóides por planta. Através dos resultados obtidos, observou-se que a duração de ovo a adulto de B. tabaci biótipo B em tomate (22,03 dias) foi estatisticamente superior a de soja (21,17 dias) e esta última significativamente superior que em couve (19,8 dias) sob as mesmas condições ambientais. O parasitóide E. formosa apresentou preferência por ovipositar no terceiro e quarto ínstares de seus hospedeiros. Comparando-se as três culturas avaliadas verifica-se que a couve apresentou número médio total de ninfas parasitadas superior aos valores obtidos para soja e tomate, que por sua vez não apresentaram diferença entre si. O parasitóide não apresentou diferença em relação à longevidade quando foram oferecidas ninfas de terceiro ou quarto ínstares nas culturas estudadas. Entretanto, verificou-se que para os dois estádios ninfais houve diferença significativa entre as culturas avaliadas. Na couve, a densidade de oito parasitóides por planta resultou em bom controle da praga. / The potencial of parasitism and the efficiency of Encarsia formosa on Bemisia tabaci were evaluated on collard green, tomato and soybean plants. The period of developmentof B. tabaci biotype B from egg to adult and the number of nymphs were evaluated on those plants. The ability of parasitism was evaluated by the number of daily parasitized nymphs and the total number of parasitized nymphs per female of E. formosa. The ideal number of parasitoids per plant was evaluated by releasing variable numbers of E. formosa on a fixed number of B. tabaci biotype B nymphs. The results were as follows: the duration of the egg to adult period of B. tabaci biotype B on tomato (22,03 days) was statistically superior to that on soybean (21,17 days), while this last one was significantly superior to that on collard green (19,8 days), under the same environmental conditions; the parasitoid showed preference to oviposit on the third and fourth instars of B. tabaci biotype B nymphs; the number of parasitized nymphs on collard green was higher than those observed on soybean and tomato, whereas the numbers on these last one did not differ; no difference was observed as to the parasitoid longevity when third and fourth instar nymphs were offered on the tested plants; however one observe a significant difference in the mean number of parasitized nymphs; on collard green plants eight parasitoids per plant resulted in a good control of this insect pest.
4

Vliv potravy na úspěšnost vývoje vybraných druhů švábů. / Effect of food on the success of development of selected species of cockroaches.

ŠIŠKOVÁ, Žaneta January 2012 (has links)
The aim of this thesis was to find out whether selected types of food substrates affect the adult´s productivity, the weight of newborn nymphs and laid oothecas and whether changes in adult´s productivity and the weight of nymphs occur due to one source of food during the experiment. In this experiment, the Blaptica dubia, Nauphoeta cinerea and Schelfordella tartara species were used. The reason for selection of those species was their high rate of reproduction, undemanding breeding and a short period of growth. The experiment was conducted in six types of feed substrates. The cockroaches were kept at a room temperature. The scales accurate to 0,2 g were used for the determination of the weight (AVINET). The Blaptica dubia species proved the dependence of its adults´ productivity and nymphs´ weight on the month of observation and the dependence of nymphs´ growth on a feed. The Nauphoeta cinerea species proved the dependence of nymphs´ growth on a feed. The Schelfordella tartara species proved the dependence of its adults´ productivity and oothecas´ weight on a feed and on the month of observation. The results of this thesis could emphasize the importance of the influence of a feed on the life of cockroaches breeded in captivity and help breeders to their better results with regard to the selection of a suitable food.
5

Aspectos bioecológicos e potencial de parasitismo de Encarsia formosa (Gahan) (Hymenoptera: Aphelinidae) sobre Bemisia tabaci biótipo B(Gennadius) (Hemiptera: Aleyrodidae) em couve tomate e soja. / Biological aspects and parasitism potencial of Encarsia formosa (Gahan) (Hymenoptera: Aphelinidae) under Bemisia tabaci BIOTYPE B (Gennadius) (Hemiptera: Aleyrodidae).

Karina Manami Takahashi 29 April 2005 (has links)
O presente trabalho teve por objetivo avaliar o potencial de parasitismo e eficiência de E. formosa sobre B. tabaci biótipo B em couve, tomate e soja. O tempo de desenvolvimento de ovo a adulto e o número de ninfas de B. tabaci biótipo B foram avaliados em soja, tomate e couve. O número de ninfas parasitadas diariamente e o número total de ninfas parasitadas por fêmeas de E. formosa até sua morte foram avaliados para determinar a capacidade de parasitismo do parasitóide. Foram realizadas liberações de números variáveis de E. formosa para um número fixo de ninfas de B. tabaci biótipo B para avaliar o número ideal de parasitóides por planta. Através dos resultados obtidos, observou-se que a duração de ovo a adulto de B. tabaci biótipo B em tomate (22,03 dias) foi estatisticamente superior a de soja (21,17 dias) e esta última significativamente superior que em couve (19,8 dias) sob as mesmas condições ambientais. O parasitóide E. formosa apresentou preferência por ovipositar no terceiro e quarto ínstares de seus hospedeiros. Comparando-se as três culturas avaliadas verifica-se que a couve apresentou número médio total de ninfas parasitadas superior aos valores obtidos para soja e tomate, que por sua vez não apresentaram diferença entre si. O parasitóide não apresentou diferença em relação à longevidade quando foram oferecidas ninfas de terceiro ou quarto ínstares nas culturas estudadas. Entretanto, verificou-se que para os dois estádios ninfais houve diferença significativa entre as culturas avaliadas. Na couve, a densidade de oito parasitóides por planta resultou em bom controle da praga. / The potencial of parasitism and the efficiency of Encarsia formosa on Bemisia tabaci were evaluated on collard green, tomato and soybean plants. The period of developmentof B. tabaci biotype B from egg to adult and the number of nymphs were evaluated on those plants. The ability of parasitism was evaluated by the number of daily parasitized nymphs and the total number of parasitized nymphs per female of E. formosa. The ideal number of parasitoids per plant was evaluated by releasing variable numbers of E. formosa on a fixed number of B. tabaci biotype B nymphs. The results were as follows: the duration of the egg to adult period of B. tabaci biotype B on tomato (22,03 days) was statistically superior to that on soybean (21,17 days), while this last one was significantly superior to that on collard green (19,8 days), under the same environmental conditions; the parasitoid showed preference to oviposit on the third and fourth instars of B. tabaci biotype B nymphs; the number of parasitized nymphs on collard green was higher than those observed on soybean and tomato, whereas the numbers on these last one did not differ; no difference was observed as to the parasitoid longevity when third and fourth instar nymphs were offered on the tested plants; however one observe a significant difference in the mean number of parasitized nymphs; on collard green plants eight parasitoids per plant resulted in a good control of this insect pest.

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