Temporal development of powdery mildew (Oidium mangiferae Berthet) epiphytotics in mango (Mangifera indica L.) orchards in Michoacan, Mexico.
Guillén-Sánchez D., Téliz-Ortíz D., Mora-Aguilera G., Mora-Aguilera A., Sánchez-García P., González-Hernández V.
Author Affiliation: Colegio de Postgraduados (C.P.), Instituto de Fitosanidad, km 36.5 Carr. México-Texcoco Montecillo, Edo. de México 56230, Mexico.
Revista Mexicana de Fitopatología 21 : 181-188
Abstract : Powdery mildew severity was evaluated in 5 mango orchards in Gabriel Zamora Michoacan, Mexico, during 1998-99, in relation to flowering phenology, conidial dynamics and temperature. The area under the disease progress curve with integrated management treatments in Cajones (MIM-Cajones) and Huaco (MIM-Huaco) localities showed the highest severity rating, while the traditional technology in Cajones (TT-Cajones) recorded the lowest. The apparent infection rate in TT-Cajones was highest, while the orchard with 45 days preflowering hydric stress (AH-45) rated the lowest. Final severity in the orchard with 30 days preflowering hydric stress (AH-30) was statistically similar (p=0.05) to MIM-Cajones, TT-Cajones, MIM-Huaco and AH-45. The highest disease severity coincided with the increment in conidia density (r2=0.97). Phenological stages of bud swollen to bud-break and protected were tolerant of powdery mildew; elongation was slightly susceptible; early and full bloom were moderately susceptible, and fruit-set and pea-size fruit stages were the most susceptible. There were no significant differences in fruit setting among treatments.