Metalaxyl penetrates fungal cells and selectively interferes with DNA synthesis, inhibiting the growth of the mycelium and the formation of spores and haustoria.
It can be used on its own or in a mixture with fungicides with different modes of action. This extends its application and use in numerous crops and broadens its spectrum of action. Three types of action are defined depending on the time of application:
Preventive action: preventing fungi from penetrating plant tissue before infection (the spores do not germinate).
Curative action: interacting with the fungus present inside the plant for up to six days after the onset of infection.
Eradicant action: inhibiting the growth of the fungus and causing its death after symptoms become visible.
The fungicidal activity of dithiocarbamates and bisdithiocarbamates (organic fungicides) was discovered in 1934, when cupric salt-based fungicides were already in use. Non-systemic contact fungicides were subsequently developed and a new stage in the chemical control of blight began in 1976 with the launch of cymoxanil, a systemic fungicide that penetrates plant tissues locally, protecting them from the inside.
The next breakthrough came in 1979, the year metalaxyl was first registered in the United States. It is a systemic, acropetal fungicide distributed by the sap in plant tissues.
In all its formulations and mixtures, Metaplays is currently used on more than 100 crops such as potatoes, vines, citrus, onions, cucurbits, brassicas, tomato, tobacco, turf grass and soya bean seeds.
In 2010, IQV obtained the inclusion of metalaxyl in Annex I to European Union Directive 91/414 for a period of ten years. The company is currently working to make it the first fungicide in the phenylamide family to be accepted worldwide.
Caring for Crops
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