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Tomato

Lycopersicon esculentum Mill.

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Symptoms induced in controlled conditions (fumigation with ozone)

Symptoms induced in controlled conditions in tomato cultivars were results from European Project Tomstress.

cv. Nikita

Ozone exposure on plants of tomato cv. Nikita produces interveinal chlorosis on the apical leaflets mainly (A). Plant of tomato with large areas of affected leaves by ozone exposure (B). Leaflets highly affected by ozone symptoms, the main veins remains green and healthy (C).

cv. UC 82 L

Affected leaf of tomato cv UC 82 L by ozone exposure, interveinal chlorosis more evident in the margin of the leaflets, also epinasty can be observed when ozone exposure persists (A).

cv. Piedmont

Chronic exposure to ozone of tomato plants, from cv. Piedmont, induce a severe discolouration of the leaves although main veins are green and unaffected (A). epinasty can be observed in the leaf and leaflet also (A).

cv. Moneymaker

Three stages of ozone symptoms on tomato leaves of cv, Moneymaker. Slight lesions induced by ozone exposure (A), interveinal chlorosis and slight stippling (B), severe interveinal, chlorosis on leaf from young plants of tomato (C).

cv. Ailsa Craig

Two different kinds of ozone symptoms on leaves of tomato cv. Ailsa Craig. Chronic ozone exposure induces interveinal chlorosis on the old leaf of the plants (A). Acute ozone exposure can produces small necrotic areas in the interveinal sections of the leaves (B).

cv. Claudia

Ozone exposure in leaves of tomato cv Claudia are similar to the other tomato cultivars. Photos A and B show slight, initial interveinal chlorosis induced by ozone.

cv. Valenciano

Interveinal chlorosis observed in the old leaves from young plants of tomato cv. Valenciano exposed to ozone in greenhouse.

cv. Merlin

Initial ozone symptoms on the apex of apical leaflet of tomato cv. Merlin exposed to ozone during 7 days (A). When ozone exposure persist whole surface of leaf lamina was affected by tanned lesions (B and C).

Symptoms observed that can be mistaken for those induced by ozone

Different pest and diseases can affect tomato leaves producing quite similar ozone-like symptoms. Spider mites can produce similar lesions to ozone (A). Other examples of virus diseases can be observed in images B, C and D. Fungal diseases produces typical necrotic spots with yellow area surrounding it (E)

© 2009 Fundación CEAM © 2009 Copyright of the photos: their authors