[Identification of host plants of the avocado borer, Stenoma catenifer Walsingham (Lepidoptera: Elachistidae) in Rio Grande do Sul]. / Identificação de plantas hospedeiras da broca do abacate, Stenoma catenifer Walsingham (Lepidoptera: Elachistidae) no Rio Grande do Sul.

Fruits of Nectandra megapotamica Mez and Cinnamomum camphora (L.) (Lauraceae) were collected in Rio Grande do Sul, Brazil, in 2004. Species of five families of insects were found inside the fruits: two fly species (Diptera: Drosophilidae: Drosophila spp.), six beetle species, Heilipus sp., Conotrachelus sp. (Curculionidae), Hypothenemus sp. (Scolytidae) and three species of Carpophilus (Nitidulidae), and moths (Lepidoptera: Elachistidae). The moth especimes were identified as Stenoma catenifer Walsingham, the avocado borer. The occurrence of the moth was predominant from early April until middle May. The natural larval infestation level was low. Two new host plant of the pest were identified.

Identificação de plantas hospedeiras da broca do abacate, Stenoma catenifer Walsingham (Lepidoptera: Elachistidae) no Rio Grande do Sul / Identification of host plants of the avocado borer, Stenoma catenifer Walsingham (Lepidoptera: Elachistidae) in Rio Grande do Sul

Frutos de Nectandra megapotamica Mez e de Cinnamomum camphora (L.) (Lauraceae) foram coletados no Rio Grande do Sul, em 2004. Nove espécies pertencentes a cinco famílias de insetos foram coletadas: duas espécies de Drosophila (Diptera: Drosophilidae), seis espécies de Coleoptera: Heilipus sp. e Conotrachelus sp. (Curculionidae), Hypothenemus sp. (Scolytidae) e três espécies de Carpophilus (Nitidulidae), e uma de Lepidoptera (Elachistidae). Os espécimes pertencentes à família Elachistidae foram identificados como Stenoma catenifer Walsingham, a broca do abacate. S. catenifer emergiu do início de abril até meados de maio. A infestação nos frutos foi baixa. Duas novas plantas hospedeiras dessa praga foram identificadas.

Fruits of Nectandra megapotamica Mez and Cinnamomum camphora (L.) (Lauraceae) were collected in Rio Grande do Sul, Brazil, in 2004. Species of five families of insects were found inside the fruits: two fly species (Diptera: Drosophilidae: Drosophila spp.), six beetle species, Heilipus sp., Conotrachelus sp. (Curculionidae), Hypothenemus sp. (Scolytidae) and three species of Carpophilus (Nitidulidae), and moths (Lepidoptera: Elachistidae). The moth especimes were identified as Stenoma catenifer Walsingham, the avocado borer. The occurrence of the moth was predominant from early April until middle May. The natural larval infestation level was low. Two new host plant of the pest were identified.

Nível de infestação de Butiobruchus sp em amêndoas de butiazeiro / Infestation levels of Butiobruchus sp in butia palm nut

As sementes do butiazeiro, Butia capitata (Martius) Beccari, são atacadas por um caruncho, Butiobruchus sp. Menos de 80 por cento das larvas originam adultos. A maioria das larvas destrói apenas uma amêndoa. O bruquídeo não é fator limitante para a sobrevivência desta palmeira.

Nuts of butia palm are attacked by a weevil, Butiobruchus sp. About 80 percent of the larvae gave origin to adults. Most of the larvae damages only one seed. This bruchid is not a limiting factor of the survival of this palm tree.