Artigo Acesso aberto Revisado por pares

Temporal analysis and fungicide management strategies to control mango anthracnose epidemics in Guerrero, Mexico

2012; Springer Science+Business Media; Volume: 37; Issue: 6 Linguagem: Inglês

10.1590/s1982-56762012000600001

ISSN

1983-2052

Autores

Abraham Monteón-Ojeda, J.A. Aguilera, Ángel Villegas-Monter, Cristian Nava Díaz, Elías Hernández Castro, Gabriel Otero-Colina, Javier Hernández Morales,

Tópico(s)

Plant Physiology and Cultivation Studies

Resumo

The temporal progress of anthracnose (Colletotrichum gloeosporioides) epidemics was studied in mango (Mangifera indica) orchards treated with fungicides from different chemical groups, mode of action, and application sequences in two regions of contrasting climates (sub-humid and dry tropics) in Guerrero, Mexico. Full flowering, initial setting, and 8-15mm Ø fruits were identified as critical stages for infection. Epidemics started 20-26 days after swollen buds, and maximum severity was attained at 40-42 days after the first symptoms were detected. The Weibull model described (r²>0.89) anthracnose epidemics in both floral and vegetative flushes. Active ingredients of different fungicide groups, mode of action, and residuality such as myclobutanil, azoxystrobin, cyprodinil+fludioxonil, quinoxyfen, and chlorotalonil + sulfur led to significantly low values (LSD 30ºC (rFl=0.79-0.86; rVeg=0.80-0.95) and relative humidity > 90% (rFl=0.66-0.86; rVeg=0.67-0.94). In both regions, conidial sporulation was related to temperature >30ºC (r=0.72-0.74), relative humidity <60% (r=0.66), severity (rFl=0.62-0.98; rVeg=0.75-0.97) and dew point <25ºC (r=0.68-0.69).

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