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The aim of this study was to obtain knowledge on arbuscular mycorrhizal (AM) associations in papaya (Caricapapaya, L.) in field soils and nursery conditions. Sixty seven soil and root samples were taken in February and May of 1996, from 47 commercial plantations in the North of Espirito Santo State and the West and South of Bahia State, in Brazil. Samples were used for direct spore counts, root colonization assessment and for trap culture with Sorghumbicolor (L.) Moench and Crotalariajuncea L. Additional sampling was done in commercial nurseries to evaluate mycorrhizal colonization. Although papaya cropping systems are usually under high input of fertilizers and pesticides, papaya roots showed considerable arbuscular mycorrhizal (AM) colonization, ranging from 6% to 83%. Colonization rates were most influenced by available soil P, correlated positively with percentage of sand and soil pH, but correlated negatively with soil clay content. AM colonization of nursery seedlings was very low in most samples. Field spore numbers varied from 34 to 444/30g of soil. All Glomerales families were represented and 24 fungal species identified. Glomusetunicatum, Paraglomusoccultum, Acaulosporascrobiculata and Gigaspora sp. were the most common species. O trabalho objetivou a obtenção de conhecimento sobre a associação micorrízica arbuscular (MA) em mamoeiro (Carica papaya, L.) em condições de pomar e viveiro. Sessenta e sete amostras de solo e raízes foram coletadas em quarenta e sete pomares comerciais nos meses de fevereiro e maio de 1996, abrangendo o Norte do Espírito Santo e o Oeste e Sul da Bahia. Amostras foram usadas para contagem direta de esporos, avaliação da colonização radicular e para cultivo armadilha com Sorghum bicolor (L.) Moench e Crotalariajuncea (L.). Amostragens adicionais foram feitas em viveiros comerciais, para avaliar a colonização micorrízica. Embora os sistemas de cultivo do mamoeiro recebam grande quantidade de insumos na forma de fertilizantes e pesticidas, as raízes apresentaram percentagem de colonização radicular variando de 6% a 83%. As taxas de colonização mostraram-se relacionadas com o P disponível do solo, correlacionando-se positivamente com areia e pH do solo, mas negativamente com os teores de argila. Em viveiros, a percentagem de colonização nas plântulas foi baixa na maioria das amostras. Em campo o número de esporos variou de 34 a 444/30g de solo. Todas as famílias do filo Glomeromycota estiveram representadas e 24 espécies fúngicas foram identificadas. Glomusetunicatum, Paraglomusoccultum, Acaulosporascrobiculata e Gigaspora sp. foram as espécies de maior ocorrência

Arbuscular mycorrhizal fungi in papaya plantations of Espírito Santo and Bahia, Brazil