Early Blight of Tomato

Disease

Early Blight of Tomato

Alternaria solani

fungi

In a Nutshell

    Dark spots with white halos on the leavesDark, concentric circles on the stems and on the fruitsTomatoes start to rot

Hosts: %1$s

· Tomato

Symptoms

Symptoms of early blight occur on older foliage, stem, and fruits. On the leaves, gray to brown spots appear that gradually grow in a concentric manner around a clear center - the characteristic “bullseye” formation. These lesions are surrounded by a bright yellow halo. As the disease progresses, entire leaves may turn chlorotic and shed, leading to significant defoliation. The same pattern of dark concentric lesions with a clear center appears on stems and fruits. Rotting of tissues follows.

Trigger

Alternaria solani overwinters primarily on infected crop debris in soil or on alternative hosts. Lower, older leaves might catch the infection when in contact with contaminated soil. Warm temperatures (24-29°C) and high humidity (90%) favor development of the fungus. It penetrates the leaf epidermis directly or enters through leaf pores. A long wet period (or alternating wet/dry weather) enhances the growth of spore cushions on the leaf spots and the release of spores. The spores are spread via wind, splashing rain or overhead irrigation.

Biological Control

You can spray algal limestone or rock flour on infected plants.

Chemical Control

Rotate different chemical compounds to avoid resistance development. Apply treatments in a timely manner, taking into account weather conditions. Fungicides containing Copper, mancozeb, chlorothalonil, azoxystrobin, pyraclostrobin, trifloxystrobin, fenamidone and famoxidone have been successfully used to control Early Blight in tomato.

Preventive Measures

    Use certified pathogen-free seedUse resistant tomato varietiesAllow for good drainage and airflow and avoid overhead irrigationUse stakes to keep the plants upright or remove the lower leaves (to a height of 40 cm)Use organic or plastic mulchRotate with non-host plantsControl susceptible weeds in and around fieldsUse plant fortifierDo not over-fertilize with potassium and maintain adequate levels of both nitrogen and phosphorusRemove all plant debris after harvest




Features

Regional Weather

Get detailed forecast and actual weather data.

Plantix offers detailed weather information on the following issues:

Precipitation

Humidity

Air Pressure

Temperature

Wind speed

Plantix Community

Get in touch with experts around the world.

Post your questions

You can post your questions and pictures and get feedback from other farmers or gardeners. Plantix' experts will answer your questions related to plant diseases and pests.

MyCommunity

Exchange with Plantix users around you, in your language and related to the crops you grow.

Global Community

Connect to farmers, gardeners, experts and interested people around the world that discuss plant diseases, remedies and best practice for sustainable farming.

AI-Driven Disease Detection

Instant diagnostics and solutions based on your picture

Image Recognition

Plantix analyzes your picture within a few seconds and gives you instant feedback on your plant problem.

Customized Management Options

On top of the detection result, Plantix offers you a detailed description of possible solutions - both biological and conventional.

Preventive measures

Plantix offers information on preventive measures to protect your crop from the next attack.