The Pro Farmer

Alternaria leaf spot

Is a fungus attacking many different crops, though the disease is progressing slowly.

In tomatoes It is called early blight.

Concentric spots of alternaria on a tomato leaf

Its symptoms are round concentric leaf spots that grow bigger, and the entire leaf become yellow and die.

Concentric spots of alternaria
Concentric spots of alternaria
Concentric spot of alternaria
Multiple concentric spots of alternaria

These symptoms may also transfer to the stems and to the fruits.

Alternaria on a tomato plant’s stem
Tomato fruit infested with alternaria

It is recommended to use at least 4 kinds of different pesticides,

and alternate between them every 3 days,

in order to overcome pest’s resistance, and completely exterminate them.

For further information about this, read this post , and this post also.

Best pesticides for Altermaria leaf spot / Early blight,

Active Ingredients:

1.Difenoconazole

2.Polyoxin Al

3.Cymoxanil

4.Boscalid

5.Trifloxystrobin

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