1. Small roundish spot are developed on the leaves, especially on the older leaves.
2. The spots enlarge and become roughly circular in shaped.
3. The centre of the spots turns white or pale brown surrounded by a dark black margin resembling the eye of a frog.
4. More than one lesion coalesce together to form a bigger lesions and maximum portion of leaves dry down and finally fallen it.
Symptoms of FrogEye Leaf spot Tobacco
Disease cycle of FrogEye Leaf spot Tobacco
The fungus may over winter in the crop residues, plant debris and on the collateral host. From this source, the air borne conidia because primary infection then favourable condition, it may cause secondary infection.
Favourable condition of FrogEye Leaf spot Tobacco
•High Relative humidity, above 80%.
•Excess use of nitrogenous fertilizer.
•Present of wounds.
Control Measure/Management of FrogEye Leaf spot Tobacco
A. Cultural method
Cultural method is good for minimizing the disease;
vOptimum fertilizer management.
vOptimum irrigation as a when necessary.
vWeeding of collateral host.
vSanitation of the field.
B. Chemical method
vSpraying Bordeaux mixture usually 2 times at 10-12 days interval.
vSpraying of fungicides like Macuprax, Cupravit, Dithane M45 @ 2% solution at2-3 times onset of disease at 20 days interval.
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