-This study describes the fauna of predator insects, parasitoids and ants associated with aphids on kale (Brassica oleracea L. var. acephala D.C.) in organic system. The aphid was identified as Lipaphis pseudobrassicae Davis, and this is the first record of the species attacking kale in Brazil. Primary parasitism by Diaeretiella sp. and Aphidius sp. and hyperparasitism by Aphydencyrtus sp., Alloxysta sp., Pachyneuron sp. and Syrphophagus sp. were observed. Twenty species of Coccinellidae were collected, and eight of them were observed in adult and larval stages attacking the aphid: Hyperaspis (Hyperaspis) festiva Mulsant, which was the most abundant (72.5% of all predator insects obtained), Cycloneda sanguinea (L.), Eriopis connexa Germar, Coleomegilla maculata DeGeer, Hippodamia convergens Guérin, Heterodiomus sp., Scymnus (Pullus) sp.1 and Scymnus (Pullus) sp.2. Aphidophagous Syrphidae larvae collected on leaves of kale infested by L. pseudobrassicae belong to the species Allograpta exotica (Wiedemann) and Ocyptamus gastrostactus (Wiedemann). Larvae and pupae of Syrphidae were parasitized by Pachyneuron sp., Syrphophagus sp.
Objetivando resistência genética ao ácaro branco (Polyphagotarsonemus latus), foram avaliadas 15 introduções de Capsicum, originárias do Banco de Germoplasma de Hortaliças da UFV, um híbrido e quatro cultivares de pimentão. O estudo foi conduzido em casa de vegetação, sob condições de disseminação natural do ácaro, adotando-se delineamento experimental inteiramente casualizado com seis repetições por genótipo. As avaliações foram procedidas através da contagem do número de ácaros adultos presentes em amostras de folhas e de uma escala de notas referente à severidade dos sintomas. A avaliação por meio de sintomas mostrou-se mais adequada para diferenciar os genótipos em resistentes e suscetíveis. Do material genético avaliado, destacaram-se as introduções BGH/UFV 1774 (C. annuum) e BGH/UFV 5086 (C. frutescens) como resistente e altamente resistente a Polyphagotarsonemus latus, respectivamente.
Organic cultivation of onion cultivars in the conditions of the Lowlands of Rio de Janeiro state, BrazilThe agronomic performance and yield of onion cultivars was evaluated on organic farming conditions in the Lowlands of Rio de Janeiro state, Brazil, also named Baixada Fluminense, from June to October 2010, in the municipality of Seropédica. The statistical design consisted of 10 treatments arranged in a randomized block design with four replications. We evaluated the total yield, the marketable and the unmarketable, as well as the classification of onions. The total yield of bulbs ranged from 14.42 to 24.09 t ha -1 , while marketable yield ranged from 14.28 to 24.09 t ha -1 . The highest yielding cultivars which can be recommended were Alfa Tropical, Alfa São Francisco, Baia Periforme, Madrugada, Primavera, Jubileu, Pêra Norte and Lola; while the lowest yielding cultivars were the Vale Ouro IPA 11 and the Franciscana IPA 10. The production of 'refused' bulbs was very low, and the cultivars Alfa Tropical, Alfa and Lola did not produce this kind of bulbs. The average weight of bulbs ranged from 54.1 to 90.3 g, and the cultivars Franciscana IPA 10 and Vale Ouro IPA 11 were those with the lowest values of 'refused' bulbs. Organic farming of onions in the studied conditions (Baixada Fluminense) is possible and capable of produce yields similar to those obtained in conventional farming.
As cultivares de jiloeiro (Solanum gilo) Tinguá, Comprido Verde Claro e Morro Redondo foram utilizadas em cruzamentos obedecendo a esquema dialélico, com os recíprocos. Os genitores e os respectivos híbridos F1 foram avaliados no campo, por 14 descritores fitotécnicos, dos quais sete foram estatisticamente analisados pelo Modelo de Griffing. Os genótipos demonstraram capacidade geral de combinação para comprimento, diâmetro e peso médio do fruto, número de dias até início da colheita e altura da planta. A capacidade específica de combinação, significativa para todas as características analisadas, indica efeitos de dominância e/ou epistáticos envolvidos no seu controle genético. Os híbridos ´Tinguá´ x ´Comprido Verde Claro´ e ´Comprido Verde Claro´ x ´Morro Redondo´ apresentaram resultados promissores para produção de frutos.
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