Prevalência da infecção por lentivírus de pequenos ruminantes em caprinos em Teresina, Piauí

The prevalence of anti-lentiviruses antibodies of small ruminants was investigated in goat herds in the city of Teresina, PI, Brazil. A seroepidemiological survey was conducted involving 480 animals, apparently healthy, belonging to six rural properties. The diagnostic test was the agar gel immunodiffusion (AGID), using antigens produced from cellular cultures infected with caprine arthritis encephalitis virus (CAEV Cork). Prevalences by gender and age were estimated considering sampling fractions for each farm. A general prevalence of 4.2%, was observerved, being 4.2% for females and 3.6% for males. Prevalences were higher among older goats. Regarding the breed standard, 23.5% were of the Anglo Nubian, 5.9% of the Boer, 35.3% Anglo Nubian x Boer crossbred, and 35.3% of undefined breed. It is concluded that small ruminant lentiviruses are endemic among goat herds of Teresina

Susceptibilidade de larvas de Cerotoma arcuata Olivier (Coleoptera: Chrysomelidae) a Beauveria bassiana (Bals.) Vuillemin, Metarhizium anisopliae (Metsch.) Sorokin e Bacillus thuringiensis Berliner Susceptibility of Cerotoma arcuata Olivier (Coleoptera: Chrysomelidae) larvae to Beauveria bassiana (Bals.) Vuillemin, Metarhizium anisopliae (Metsch.) Sorokin and Bacillus thuringiensis Berliner

Larvas de 2&deg; instar de Cerotoma arcuata foram avaliadas em relação à susceptibilidade aos fungos entomopatogênicos Beauveria bassiana, Metarhizium anisopliae e a bactéria Bacillus thuringiensis com as toxinas Cry3. Os insetos adultos foram mantidos em gaiolas e alimentados com plântulas de feijão (Phaseolus vulgaris L.) e as larvas em "gerbox" com cotilédones de plântulas de feijão recém-germinadas. Das oito estirpes de B. bassiana avaliadas, CG 156 e CG 213 causaram 100% de mortalidade das larvas, as duas estirpes de M. anisopliae CG 210 e CG 321 foram patogênicas, eliminando 80 e 100% das larvas de C. arcuata, e, das cinco estirpes de B. thuringiensis testadas, o isolado CG 940 causou 70% de mortalidade das larvas.<br>Second instar larvae of Cerotoma arcuata were evaluated concerning the susceptibility to fungi Beauveria bassiana and Metarhizium anisopliae and Bacillus thuringiensis strains containing Cry3 toxin. Adults of C. arcuata were kept in large cages and fed on bean seedlings and the larvae were reared in ‘gearbox’ feeding on germinated Phaseolus bean cotyledons. Strains CG 156 and CG 213 of B. bassiana killed 100% of the insect larvae and strains CG 210 and CG 321 of M. anisopliae killed 80 and 100% of the insect larvae. Strain CG 940 of B. thuringiensis killed 70% of the insect larvae

Produção de serrapilheira no Cerrado e Floresta de Transição Amazônia-Cerrado do Centro-Oeste Brasileiro Litterfall production in the Brazilian mid-western Amazonia-Cerrado transition forest

O presente trabalho teve como objetivo verificar a variação da produção de serrapilheira de diferentes biomas: Cerrado (com as fitofisionomias Cerrado sensu stricto e Cerradão) e Floresta de Transição Amazônia-Cerrado, em clima tropical. Para a determinação da produção de serrapilheira foram utilizados coletores de tela em náilon. Dados micrometereológicos foram coletados nas áreas de estudo. A produção de serrapilheira nos dois biomas mostrou acentuada sazonalidade, com as maiores produções ocorrendo durante a estação seca e menor durante a estação chuvosa. A maior produção de serrapilheira ocorreu na Floresta de Transição, seguida do bioma Cerrado. A fração de folhas foi mais representativa do que as frações de galhos, flores, frutos em ambas as áreas estudadas.<br>The objective of the present work was to verify the variation of litterfall production of different biomass: a cerrado ("savanna") with vegetation types Cerrado sensu stricto ("orchard-like vegetation") and Cerradão ("woodland-like vegetation") and Amazonia-Cerrado transition forest in a tropical climate. To determine the litterfall production, we used nylon screen traps. Micrometereologic data was collected in both areas of study. The litterfall in two biomass revealed themselves as seasonal, with the highest productions occurring during the dry season and the lowest during the wet. The biggest litterfall occurred in the Transition Forest, followed by the Cerrado biome. Leaf fraction was more representative than twigs, flowers, fruits in both areas studied