RESUMEN
Abstract A new species of Diolcogaster (Hymenoptera: Braconidae) is described and illustrated. Additionally, its position within the recently published key to New World species of the xanthaspis species-group (to which the described Diolcogaster belongs) is provided. The gregarious larval parasitoid Diolcogaster choi sp. nov. was collected in Maringá, Paraná State, Brazil. This natural enemy was recovered from a caterpillar of Hypercompe cunigunda (Stoll, 1781) (Lepidoptera: Erebidae) that was feeding on plant of passionflower, Passiflora edulis Sims (Passifloraceae). The fauna of the xanthaspis group in the New World now includes five species, including the new species from Brazil described in this paper. Diolcogaster choi sp. nov. differs anatomically, and is morphologically diagnosed, from all other known member of the xanthaspis group of the genus Diolcogaster, to which it belongs. The species also differs in recorded host, and its DNA barcode appears to be distinctive among described Diolcogaster.
RESUMEN
O maracujazeiro é atacado por diversos patógenos, entre eles o fungo Septoria passiflorae, causador da septoriose. Objetivando-se analisar a reação de genótipos de maracujá azedo a septoriose, foi conduzido um experimento com mudas, em casa de vegetação, na Estação Biológica da Universidade de Brasília, em blocos casualizados com quatro repetições e 6 plantas por parcela, testando-se 48 genótipos. A inoculação do patógeno foi feita por aspersão na planta com, suspensão contendo concentração de 5,0 x 106 esporos/ml, produzidos em meio de cultura. Foram feitas duas avaliações, com intervalos de 25 dias. As plantas foram avaliadas de acordo com a escala de notas de 1 a 4, sendo 1 para Plantas sem sintomas; 2 ? Lesões esparsas nas folhas; 3 ? Lesões coalescendo tomando mais de 25 % do limbo foliar; 4 ? Planta com desfolha. Houve diferenças significativas entre os genótipos para todos os parâmetros avaliados. Destacaramse os genótipos MAR 20-09, MAR 20-53 e MAR 20-60, como mais resistentes a septoriose em condições de cultivo protegido, enquanto os genótipos MAR 20-43, MAR 20-39 e MAR 20-01 foram os mais suscetíveis. (AU)
Passionfruit is affected by many diseases caused by pathogenic fungi. One of them is Septoria passiflorae, causing septoriosis. In order to evaluate the reaction of Passionfruit genotypes to septoriosis, an essay was carried out in greenhouse conditions in the experimental station of Universidade de Brasília. It was designed by randomized blocks with four replications and six plants per plot. A number of 48 genotypes were tested. The inoculation was done by spraying a suspension of conidia at 5,0 x106 spores/ml. Six evaluations were done, at 7 days intervals. The scores were done using a lesion scale graded from 1 to 4, 1- no visual disease, 2-spread lesions on the leaves, 3- coalescent lesions with more than 25% of leaf surface, 4-falling leaves. The plants had small significant differences between the averages of grades, so there was little reduction of grades from first to second evaluation time (50 days), probably by theincrease of leaf area. The genotypes MAR 20-09, MAR 20-53 and MAR 20-60, were considered resistant to septoriosis at greenhouse conditions, and the MAR 20-43, MAR 20-39 e MAR 20-01 were more susceptible. (AU)
