Behaviour of some Tomatoes (Lycopersicon esculentum Mill.) and Cucumber (Cucumis sativus L.) Landraces to some Phytophagous Parasites

Aurel Maxim, Mignon Șandor, Veronica Bolboacă, Antonia Odagiu, Lucia Mihalescu, Ioan Ovidiu Maxim

Abstract


The failure of industrialized agriculture, on the one hand, and the advantages of the landraces of cultivated plants on the other one, determined the European and global bodies to enact some measures concerning the conservation of green plants genetic resources. 28 tomato landraces and 12 cucumber landraces from seven counties of Transylvania were collected and identified in 2009. The behaviour of these landraces, cultivated both in plastic tunnel and filed, to the attack of diseases and pests was studied. In case of tomatoes, the level of attack of greenhouse white fly and black fungus was studied. Concerning the cucumber, the resistance to common mite and aphids was assessed. For comparison, five approved cucumber cultivars and four of tomatoes were cultivated. Regarding the tomatoes, the landraces: BN-360, CJ-357, CV-346, SJ-385 and SM-339 registered the lowest attack of greenhouse white fly (T. vaporariorum Westwood). The same landraces registered also the lowest attack of black fungus (Capnodium sp.), this being a direct interrelation. Instead, in case of the four approved cultivars, the resistance to the greenhouse white fly was rated as low. Concerning the cucumbers the level of common mite (T. urticae Koch.) attack was: low in case of nine landraces (75%) and medium in case of three landraces (25%). Eleven landraces proved a high resistance to aphids (C. gossypii). Our research on the behaviour of tomatoes  and cucumbers (12) landraces to pests brought into notice four tomatoes landraces with high resistance to greenhouse white fly  and implicit to black fungus. As concerns the cucumbers, eight landraces have had high resistance to common mite and aphids.


Keywords


landraces, tomatoes, cucumber, resistance, mites, aphids, greenhouse white fly, black fungus.

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