A. A. Müller

Seleção genética em progênies híbridas de coqueiro

O presente trabalho objetivou realizar a selecao genetica de individuos hibridos superiores de coqueiro a partir da avaliacao de 1.080 plantas para producao de frutos e de albumen fresco, visando a ao fornecimento de sementes e/ou clones melhorados para plantio no Para. Empregaram-se o delineamento experimental de blocos ao acaso e os metodos Blupis e Blupis-Biefeitos, visando identificar em quais parcelas estao os melhores individuos e quantos individuos devem ser selecionados de cada parcela. Foram avaliados os caracteres numero de frutos (NF), peso de albumen fresco por fruto (PAFF) e peso de albumen fresco por planta (PAFP), em nove safras anuais. As estimativas dos coeficientes de determinacao genetica entre medias de progenies variaram de 81,12% a 97,38%, propiciando acuracias seletivas de 90,07% a 98,68% para a selecao entre familias hibridas. A interacao familias x safras foi de grande magnitude para os caracteres NF e PAFP, conforme revelado pelas baixas (40,77% a 63,36%) correlacoes genotipicas atraves das safras. O procedimento Blupis - Biefeitos indicou a selecao de 66 plantas, sendo 48 da familia PB113 e 18 da familia PB111, propiciando intensidade de selecao de 6,1% e ganho genetico de 9,95%.

First occurrence of Alcaeorrhynchus grandis (Dallas) (Hemiptera: Pentatomidae) preying on defoliating caterpillars of oil palm in the state of Pará, Brazil.

The oil palm Elaeis guineensis is usually attacked by pests, particularly, defoliating caterpillars. Between 2004 and 2006 a stinkbug predator (Asopinae) was registered preying on caterpillars of Brassolis sophorae L., Opsiphanes invirae Hübner (Lepidoptera: Nymphalidae) and Sibine spp. (Lepidoptera: Limacodidae), reducing their populations in commercial oil palm plantations in the State of Pará, Brazil. Specimens of the natural enemy were collected, mounted, and identified as Alcaeorrhynchus grandis (Dallas) (Hemiptera: Pentatomidae), corresponding to the first report of the occurrence of this stinkbug attacking defoliating caterpillars of oil palm in Brazil.

Avaliaçao de híbridos de coqueiro (Cocos nucifera L.) para produção de frutos e de albúmen sólido fresco

The performance of six hybrids of coconut palm were evaluated for fruit and solid fresh albumen production in Moju, State of Para. The evaluated hybrids were: PB 121 (Dwarf Yellow of Malaysia x West African Giant); PB 111 (Dwarf Red of Cameron x West Afican Giant); PB 141 (Dwarf Green of Brazil x West Aficam Giant); PB 123 (Dwarf Yellow of Malaysia x Renels Giant); PB 132 (Red Dwarf of Malaysia x (Giant from Polynesia); PB 113 (Dwarf Red of Cameron x Renels Giant) in hazard blocks and six repetitions. It was verified through variance analysis, significancy difference between treatments, as result of the heterogeneity of the studied genetic material. The sources of variation year and the interaction years x treatments showed also highly significant, evidencing that the behavior of the hybrids was induced for those sources of variation. Considering the performance of the hybrids in the period of nine years of evaluation for fruit and fresh solid albumen production, the hybrids PB 111, PB 113 and PB 141 may be recommended for planting in Para State.

Estimativa dos coeficientes de repetibilidade para produção de fruto e albúmen sólido em coqueiro híbrido

The objective of this work was to estimate the coefficient of repeatability for production of fruits and solid albumen in coconut palm (cocos nucifera) using statistical methods of the variance analysis (ANOVA), main components (covariance and correlation) and structural analysis (covariance). Significant variability was detected between hybrids for fruits and solid albumen productions. Repeatability coeficients obtained by the variance analysis and structural analysis (correlation) showed the smallest values. If the level of 90% is considered sufficient to select hybrids with relative superiority for fruit and solid albumen productions based on the estimation of repeatability by the main components method (covariance), then it would be recommended to perform five and three evaluations for fruit and solid albumen productions, respectively.