Target spot, or early blight is one of the most common diseases attacking leaves and stems of potatoes and tomato. The disease is caused by the fungus Alternaria solani. On the leaves the disease starts as small circular to oval dark brown to black spots. These spots enlarge, becoming oval to angular, and are normally confined within the main veins of the leaflets. They are up to 6 mm in diameter. Under very favourable conditions individual spots can grow to 10-12 mm. They become leathery looking, and the development of close concentric rings within each spot gives the disease its name, target spot. When the disease is severe, spots can unite and cause an upward rolling of the leaf tips and death of leaves. Spots that develop on stems are more elongated than those on the leaves. Target spot can sometimes infect the tubers. It appears as small dark, slightly sunken, circular to irregular-shaped lesions (10 to 20 mm in diameter), with slightly raised margins. A brownish, corky dry rot up to 6 mm deep develops in the tissue beneath the lesion. Affected tubers are prone to attack from other soil fungi which can cause complete rotting of the tuber.

 

How to control Target Spot

Chloronil Pro

Chloronil Pro - PACKSHOT

720g/L Chlorothalonil Chloronil Pro is a broad spectrum protectant fungicide for the control of a range of diseases in fruit, vegetable,… Read More

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Unizeb 750 DF

UniZeb 750 DF bag

Unizeb is a dry flowable preventative fungicide formulation for the control of certain fungal diseases of fruit, vegetables, ornamentals and turf.… Read More

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Zineb

Zineb fungicde bag

Zineb is a general purpose fungicide for turf, fruit tress, vegetables and ornamentals Economical crop protection from downy mildew, rust, leaf… Read More

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Transact

Transact _20L

Transact is a broad spectrum fungicide containing 500g/L of the active ingredient Iprodione and is an aqueous formulation for control of… Read More

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