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A small concentration of copper ions may be taken up by plants as essential nutrients. Copper foliar sprays are also applied to correct plant copper deficiency. [8] Excess absorbed copper ions can kill sensitive cells in copper sensitive plants. The leaves of stone fruit trees are more sensitive to copper phytotoxicity than apple leaves
Bordeaux mixture (also called Bordo Mix) is a mixture of copper(II) sulphate (CuSO 4) and quicklime (Ca O) used as a fungicide. It is used in vineyards, fruit-farms, vegetable-farms and gardens to prevent infestations of downy mildew , powdery mildew and other fungi.
These predictions are based mainly on mean daily temperature and rainfall, and have been used to create a simple program that indicates when spraying is necessary. The most commonly used means of control of Oidium mangiferae is the use of sulfur and copper fungicides, particularly copper sulfate and elemental sulfur. [12]
Downy mildew is primarily controlled through the use of several fungicides applied during midseason. The fungicides used include azoxystrobin, copper, chlorothalonil, mancozeb, and maneb. Farmers in Florida who regularly use fungicides have been shown to reduce yield losses due to downy mildew to as low as 2%. [67]
Translaminar fungicides redistribute the fungicide from the upper, sprayed leaf surface to the lower, unsprayed surface. Systemic fungicides are taken up and redistributed through the xylem vessels. Few fungicides move to all parts of a plant. Some are locally systemic, and some move upward. [3] [4]
This will help reduce the rate at which pathogens may develop resistance to Benomyl products. Prior to shuck split, the recommended fungicide for cherry leaf spot is chlorothalonil (Bravo and generics). [3] This fungicide is a multi-site protectant and is excellent for leaf spot control and is not at risk for fungicide resistance development.
Keep the plant or crop in a sunny, aerated, well-drained area. Selecting for a tolerant variety of plant, and if needed, intercropping, can reduce the rate of infection. If needed copper fungicides may assist but would need to be applied every two weeks if the environment remains wet. [6]
Paclobutrazol (PBZ) is the ISO common name for an organic compound that is used as a plant growth retardant and triazole fungicide. [2] [3] It is a known antagonist of the plant hormone gibberellin, acting by inhibiting gibberellin biosynthesis, reducing internodal growth to give stouter stems, increasing root growth, causing early fruitset and increasing seedset in plants such as tomato and ...
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