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In some large acreage crops, fungicides are applied by air. The process is expensive and fungicide application is best reserved for seasons when foliar diseases are severe. Research indicates, the higher the foliar disease severity, the greater the return from the use of fungicides. [25] Southern corn rust disease, can be confused with common rust.
Fungicide sprays applied in a timely manner are highly effective against the rust diseases during the apple cycle. [12] Most protective fungicide sprays are applied four times at 7- to 10-day intervals, starting with pink bud on crabapples. These applications are to protect the apples from spores being released from the cedar host in mid-spring.
Fungicide application during fall, in the month of September, is the most beneficial for the health of the plant. There may be development of fungal resistance if there is overuse of any single product. The fungicides are primarily protectants therefore, cannot eradicate the disease after it becomes established. [1]
In terms of disease, rust is a fungus that can sometimes affect plumeria in humid conditions. It appears as small orange spots on the leaves. Clark recommends using a fungicide spray or neem oil ...
Growers are advised to treat for white rot once the sugar content of the fruit reaches approximately 10%. USDA estimates that 20% of apple orchards in eastern states are infected with the fungus and that without fungicide use yield losses would be 65%. [15]
However, in practice there are different fungicides that are recommended for use in different countries, depending on the Allium crop. For example, in Ethiopia, the fungicides mancozeb, propiconazole, tebuconazole or azoxystrobin are approved for use to control the fungus. They will control the rust if sprayed on the plant at 10-day intervals. [5]
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