Healthy tomato plants have solid green leaves. Plants to develop with tiny leaf spots, brown spots, caused by the fungus Septoria lycopersici. One common tomato disease begins with the infection spotting with pimples as fungal spores in the center of each lesion. The infection eventually leads to premature defoliation or leaf drop.
One of the dangers of leaf spot is the impact of the disease on plants lose leaves. Tomato plants need leaves for numerous functions, including fruit ripening. Leaves shade the fruit and protects them from sunscald. It is possible not all tomatoes are fired, but keep the plant lives, risking serious damage to crops throughout the season.
Keeping tomato plants infected full leaf spot is not recommended. The attempt to save the work means exposing nearby flowers and plants for the disease. Saving future tomato plants in the garden possible, saving the diseased plant is not likely. Dispose of the whole plant and plant parts by plowing under the garden.
When the infection spreads from the fungus to start on the lower leaves, you may still be able to save your tomatoes. Apply fungicide every seven to 10 days or more when the first fruits of the first cluster are visible after the flowers drop. Use the spray in warm, humid weather, such as spore production most active when temperatures range from 60 degrees to 80 degrees with windy, rainy conditions. Chlorothalonil or maneb fungicides are most effective.
From tomato plants on the same garden is not safe unless you completely get rid of the old earth and all infected debris. It is safer to turn tomatoes with corn, maize and pulses. Richard M. Riedel at the Ohio State University Extension recommends a 4-year crop rotation, where leaf spot disease has been severe.