Open AccessCONTROL OF Lasiodiplodia theobromae, THE CAUSAL AGENT OF DIEBACK OF SAPOTE MAMEY [Pouteria sapota (Jacq.) H. E. Moore and Stearn] GRAFTS IN MÉXICO
Author(s) -
Juan Manuel TovarPedraza,
J.A. Aguilera,
Cristian Nava Díaz,
Daniel Ortiz,
Ángel Villegas Monter,
Santos Gerardo Leyva Mir
Publication year - 2013
Publication title -
revista fitotecnia mexicana
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.238
H-Index - 16
ISSN - 0187-7380
DOI - 10.35196/rfm.2013.3.233
Subject(s) - lasiodiplodia theobromae , fungicide , horticulture , mycelium , tebuconazole , biology , botryosphaeria , ec50 , iprodione , botany , in vitro , biochemistry
Dieback of sapote mamey [Pouteria sapota (Jacq.) H. E. Moore and Stearn] grafts caused by Lasiodiplodia theobromae significantly reduces the success of grafting in Mexican nurseries. Semi-commercial tests were conducted in a sapote mamey nursery during two grafting seasons to evaluate the effectiveness of a physical treatment (washing) and three chemical treatments (fungicide dip) on scions. Washing reduced disease incidence up to 31 %, whereas chemical treatment reduced it up to 62 %. The combination of washing and thiabendazole dip resulted in an incidence decrease of 81 %. Twelve other fungicides were screened in vitro to evaluate mycelial growth inhibition of L. theobromae. The pre-formulated mix of cyprodinil + fludioxinil was the most effective fungicide with EC50 value of 0.0043 μg mL-1, followed by pyraclostrobin + boscalid, prochloraz and tebuconazole with EC50 values < 0.1 μg mL-1, and iprodione and thiabendazole with EC50 values < 1.0 μg mL-1. This study provides novel information about strategies for controlling L. theobromae infection during the grafting process of sapote mamey and it also showed the effectiveness of several fungicides under in vitro conditions for controlling this plant pathogenic fungus.