AVALIAÇÃO DE PLANTAS COM ATIVIDADE DETERRENTE ALIMENTAR EM Spodoptera frugiperda (J.E.SMITH) E Anticarsia gemmatalis HUBNER

Abstract

Avaliou-se a atividade inibidora de alimentação de plantas nativas do Mato Grosso do Sul, utilizando lagartas dos insetos-pragas Spodoptera frugiperda e Anticarsia gemmatalis como organismos testes. Para os bioensaios foram preparados extratos alcoólicos pelo método da percolação, que após diluição foram aplicados em discos de folhas de milho ou de soja. Com os resultados das áreas consumidas foram calculados os índices de inibição alimentar. As espécies de plantas que apresentaram alguma atividade foram Agonandra brasiliensis, Ocotea suaveolens, Annona dióica e Machaerium hirtum (a mais ativa). Análises de grupos químicos presentes nas espécies mais ativas apontam a presença de saponinas, alcalóides, cumarinas ou flavonóides. EVALUATION OF PLANTS WITH ANTIFEEDANT ACTIVITY IN Spodoptera frugiperda (J.E. SMITH) AND Anticarsia gemmatalis HUBNER Abstract The antifeedant activity of native plants from Mato Grosso do Sul against caterpillars and phytophagous insects Spodoptera frugiperda and Anticarsia gemmatalis with test organisms was evaluated. For the bioassays alcoholic extracts were prepared by the percolation method which after dilution where applied on discs of corn and soya leaves. With the results of consumed areas the antifeeding index were calculated. The plant species that presented some activity were Agonandra brasiliensis, Ocotea suaveolens, Annona dioica and Machaerium hirtum (the most active). Chemical group analysis presented in the most active species revealed the presence of saponins, alkaloids, cumarins or flavonoids.

Evaluation of the antifungal activity by plant extracts against Colletotrichum gloeosporioides Penz

“…Regarding O. manjorona, the difference between values shown in Table 1 and Table 2 was much smaller, but for Citrus sp. the percentage of germinated spores was about four times less in the former Table. Probably, it ocurred due to differences in the plant collecting period, which can influence metabolite production (SAITO et al, 2004).…”

POTENCIAL FUNGICIDA DO EXTRATO ETANÓLICO OBTIDO DAS SEMENTES DE <i>Pachira aquatica</i> AUBL. SOBRE <i>Fusarium sp</i>

“…Isto revela que vegetais do mesmo gênero tendem a possuir compostos semelhantes, apesar de possuírem intensidades diferentes, o que pode ser atribuído as diferenças estruturais e/ou concentrações das substâncias nos tecidos, porém com perspectivas de apresentarem atividades biológicas semelhantes (Saito et al, 2004 …”

Biological potential and microencapsulation of Cinnamomum cassia essential oil as an alternative for pest control in stored maize

“…Among the functions of these compounds used to control pest insects, the insecticide, a sterilizing action, or that only drive insects away from plants, such as repellents and food inhibitors, stand out (Saito et al, 2004). The repellent activity is the most common of EOs and its major components, whose action occurs through interaction with the insect's integument through contact, causing even asphyxia, also can to acting on digestive and neurological enzymes.…”