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Crop Protection Database – Technical information, conditions of use, application methods, resistance management and modes of action.

#F004#

Fungicida

BENALAXYL

Fungicide

GROUP

FRAC 4

GROUP NAME

Acylalanines

MoA (Mode of Action)

Inhibition of RNA and nucleic acid synthesis

RESISTANCE LEVEL

High

CLASSIFICATION

Systémique

TYPE

Specific site

ACTIVITY

Preventive and initial curative

Description

A systemic fungicide belonging to the acylalanine group, primarily used to control oomycetes such as downy mildew, Phytophthora, and Pythium. It acts by inhibiting ribosomal RNA synthesis through interference with the pathogen's nucleic acid synthesis, blocking mycelial growth, development, and sporulation. It exhibits systemic absorption and upward movement within the plant, providing preventative protection and some curative activity in the early stages of infection. Its high specificity against oomycetes ensures high efficacy, but also a high risk of resistance development when used repeatedly without appropriate rotation strategies.

Application Conditions

It should preferably be applied preventively or at the beginning of an infection, ensuring uniform coverage and respecting the authorized doses. It is recommended to alternate its use with fungicides from different FRAC groups and to combine it with multi-site fungicides to reduce the selection pressure for resistance. Repeated use within the same growing season significantly increases the risk of loss of efficacy.

Compatibility in Treatment Programs

Compatible with multi-site fungicides and resistance control programs

Cross-Resistance

There is strong cross-resistance within FRAC 4 between benalaxyl, metalaxyl, mefenoxam, furalaxyl, and other acylalanines

Maximum Number of Applications

Generally a maximum of 1 consecutive application or according to label and FRAC strategy

Recommendations for Use

Alternate and mix with multi-site fungicides or different FRAC groups

Compatibility with Beneficial Organisms

Generally yes, as it is a fungicide specifically for oomycetes

Technical Notes

Resistance to acylalanines is one of the best-known cases in modern plant pathology. Resistant oomycete populations can exhibit significant loss of sensitivity to several FRAC 4 compounds due to cross-resistance. FRAC recommends limiting consecutive applications and using anti-resistance mixtures with multi-site fungicides.

Products Based on:

BENALAXYL

Related Treatments

Plantynia mobile app for plant care and the diagnosis of pests and diseases.
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