Abstract

HERNANDEZ, M.A et al. EVALUATION OF TWO VARIETIES OF LETTUCE (Lactuca sativa L.) TO BE USED AS TRAP OF CROP OF Meloidogyne incognita Kofoid AND white (Chitwood). Rev. Protección Veg. [online]. 2008, vol.23, n.2, pp. 99-103. ISSN 2224-4697.

Two varieties of lettuce ("Chile 1185-3" and "Black Seeded Simpson") were evaluated as trap crops for M. incognita in semi-controlled conditions. Evaluations were carried out at 25 and 30 days after the inoculation of three nematode levels (0.5 J_2. g^-1 soil, 1.5 J_2. g^-1 soil and 2.5 J₂. g^-1 soil). High susceptibility to M. incognita was shown by the two varieties of lettuce evaluated. Root symptoms and damages, as well as the production of egg masses and eggs were increased as long as the infestation levels of nematodes were higher. A slight increasing of nematode eggs and egg mass productions was observed on lettuce var. "Chile1185-3". It was demonstrated that the nematode infesting lettuce roots when used as a trap crop have to be removed from the soil between 25 and 30 days. Otherwise, the main goal of this cultural practice could be failed.

Keywords : Meloidogyne incognita; nematode management; trap crop; lettuce; Lactuca sativa.

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