Abstract

SALGADO-GARCIGLIA, Rafael; MOLINA-TORRES, Jorge; LOPEZ-MEZA, Joel E.  and  LOEZA-LARA, Pedro D.. Effect of crude extract and bioactive compounds of Heliopsis longipes on anthracnose incidence, mycrrhization, and nodulation of bean. Agrociencia [online]. 2008, vol.42, n.6, pp.679-688. ISSN 2521-9766.

For bean (Phaseolus vulgaris L.) anthracnose control under greenhouse and field conditions, the effect of crude extract and the mixture of bioactive afinina (A) compounds and bornyl decatrién (DB) obtained from Heliopsis longipes 'A. Gray' Blake root was assessed. Besides, the effect on bean root colonization by shrub vesicle mycorrhizal fungi (HMVA) and nodulation of nitrogen-fixing bacteria was evaluated. Two of the EC concentrations (700/70 and 70/7_/µg mL^-1) and A/DB (700/70 and 70/7 µg mL^-1), under greenhouse conditions, reduced anthracnose incidence by 90%, without significant reduction (p > 0.05) of dry weight of the treated plants. Under field conditions, the evaluated EC concentrations (70/7 µg mL^-1) and A/DB (70/7 µg mL^-1) reduced anthracnose incidence reduction by 88%, without significant effect on dry weight of the treated plants (p>0.05), which confirmed the capacity of these compounds to reduce the disease. Application of EC and A/DB mixture under field conditions did not affect establishment of HMVA and nitrogen-fixing bacteria in bean roots.

Keywords : Colletotrichum lindemuthianum; integrated pest and disease management; secondary metabolites; new fungicides.

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