Product name

Metalaxyl

Biochemistry

Inhibits protein synthesis in fungi, by interference with the synthesis of ribosomal RNA.

Mode of action

Systemic fungicide with protective and curative action, taken up by leaves, stems and roots.

Uses

To control diseases caused by air- and soil-borne Peronosporales on a wide range of temperate, subtropical and tropical crops. Foliar sprays with mixtures of metalaxyl and protectant fungicides are recommended to control air-borne diseases caused by Pseudoperonospora humuli on hops, Phytophthora infestans on potatoes and tomatoes, Peronospora tabacina on tobacco, Plasmopara viticola on vines, Bremia lactucae on lettuce, and downy mildews on various vegetables, at 200-300 g/ha. Soil applications of metalaxyl alone are used to control soil-borne pathogens causing root and lower stem rots on avocado and citrus, at 500-1500 g/ha. Seed treatments control systemic Peronosporaceae on maize, peas, sorghum and sunflowers, as well as damping-off (Pythium spp.) of various crops.

Product name

Copper Oxide

Biochemistry

Copper ions are thought to be passively absorbed by fungal and bacterial spores as they grow. Once absorbed, copper is thought to disrupt the enzyme systems of the pathogenic organisms.

Mode of action

Foliar fungicide with contact, preventive action. Deposits must be on the crop before fungal spores begin to germinate.

Uses

Copper is used on numerous crops against fungal and bacterial diseases.

Phytotoxicity

Plum and peach foliage may be injured, especially at low temperatures.

Compatibility

Incompatible with alkali-sensitive pesticides such as organophosphorus compounds and carbamates, and with strongly alkaline pesticides, such as lime sulfur.