5 documents found, page 1 of 1
Aggressiveness and host specificity of Brazilian isolates of Phytophthora infes...
Suassuna, N. D.; Maffia, L. A.; Mizubuti, E. S. G.The population of Phytophthora infestans in Brazil consists of two clonal lineages, US-1 associated with tomatoes and BR-1 associated with potatoes. To assess whether host specificity in these lineages resulted from differences in aggres- siveness to potato and tomato, six aggressiveness-related epidemiological components – infection frequency (IF), incu- bation period (IP), latent period (LP), lesion area (LA)...
Factors influencing infection of eucalypts by Cylindrocladium pteridis
Graça, R. N.; Alfenas, A. C.; Maffia, L. A.; Titon, M.; Alfenas, R. F.; Lau, D.; Rocabado, J. M. A.The pattern of Cylindrocladium pteridis adhesion, germination and penetration in eucalypt leaves was assessed using scanning electron microscopy. The effects of inoculum concentration, leaf wetness period, plant age and branch position of cylindrocladium leaf blight and defoliation severity were assessed in greenhouse studies using two Eucalyptus grandis E. urophylla hybrid clones. Penetration occurred through ...
Biological control by Clonostachys rosea as a key component in the integrated m...
Cota, L. V.; Maffia, L. A.; Mizubuti, E. S. G.; Macedo, P. E. F.Gray mold, caused by Botrytis cinerea, is an important strawberry disease. As gray mold control is difficult, there is a need to evaluate integrated methods to successfully manage the disease. The efficiency of integrating Clonostachys rosea sprays, fungicide sprays, and crop debris removal to manage gray mold was evaluated in field experiments conducted in 2006 and 2007. Leaf colonization by C. rosea (LAC), av...
Effectiveness of systemic fungicides in the control of Quambalaria eucalypti an...
Ferreira, E. M.; Alfenas, A. C.; Maffia, L. A.; Mafia, R. G.; Mounteer, A. H.Eucalypt leaf spot caused by Quambalaria eucalypti is currently one of the main diseases occurring in mini-clonal hedges cultivated in sand beds with drip fert-irrigation or hydroponic tanks. Given the lack of studies on the effectiveness of fungicides for control of this pathogen, the protective, curative and antisporulating effects of systemic fungicides and their influence on production and rooting of eucaly...
Brazilian isolates of Clonostachys rosea: colonization under different temperat...
Cota, L. V.; Maffia, L. A.; Mizubuti, E. S.In a research programme for managing diseases caused by Botryis cinerea, four isolates of the antagonistic fungus Clonostachys rosea (Cr) were obtained from different ecosystems in Brazil. We studied ecological requirements for the colonization of strawberry leaves by these isolates. Temperature effects on both mycelial growth in vitro and leaf colonization by Cr were studied. At 10°C, growth on potato dextrose...