Effect of Aqueous Extract of Different Vegetal Species in Management of Meloidogyne incognita in Tomato in Protected Environment

The annual losses in vegetables caused by nematodes are estimated at around 10- 12%. The aim of this study was to evaluate the effect of different aqueous extracts in the management of Meloidogyne incognita on tomato cultivated in protected environment. We used the following treatments: control (treated with distilled water), aqueous extract of mulberry (Morus nigra) to 20%, aqueous extract of herb Santa Maria (Chenopodium ambrosioides) to 20%, aqueous extract of lemon grass (Cymbopogon citratus) to 20%, aqueous extract of eucalyptus (Corymbia citriodora) to 20%. Seedlings of tomato " Santa Clara" cultivar were transplanted into five liters plastic pots. Shortly afterwards, the soil was infested with a suspension containing 5,000 eggs of M. incognita. On the day of infestation of the soil, 25 mL of the extracts were applied separately to each vessel to the soil with a pipette. For the control, were applied 25 mL of distilled water was applied. There were four applications every 15 days. At 60 days after inoculation, we assessed the number of eggs and galls per root system, the fresh weight of root and shoot and plant height. The statistical design was completely randomized with five treatments and seven replicates. It can be concluded that the aqueous extract of Morus nigra, Chenopodium ambrosioides, Cymbopogon citratus and Corymbia citriodora were effective in controlling M. incognita in tomato by reducing the number of formed galls and egg.