Effect Of Different Concentrations Of Aqueous Garlic Extract On Meloidogye Spp. Population, Root Galling And Fruit Yield Of Tomato (Solanum Lycopersicum L.)
The cost of tomato production has increased due to the high cost of effective nematicides. Chemical nematicides are not readily available and most are not effective. There is also health and environmental hazards associated with their use hence the need to study alternative chemicals which are environmentally friendly, easily available and cheaper A pot experiment was conducted between September and December, 2010 at the Plant house of the Faculty of Agriculture, University for Development Studies, Nyankpala, Tamale to investigate the effect of aqueous garlic extract on root knot nematode of tomato. There were four treatments: 10 g/50 ml aqueous garlic extract, 20 g/50 ml aqueous garlic extract, 30 g/50 ml aqueous garlic extract and control replicated four times in a completely randomised design. The soils were inoculated with 2000 eggs of Meloidogyne species a week before the application of the treatment. Data were collected on each tomato plant pot. Parameters measured were plant height, stem girth, number of leaves, number of fruits per plant, fruit weight, root galling, egg mass index and root knot nematode population in the soil. There were significant differences among the treatment means for root galling, nematode population and egg mass index. Garlic extract significantly reduced (p=0.05) nematode population compared to the control. However, 30 g/50 ml of the aqueous garlic extract recorded a significantly higher (p=0.05) reduction in nematode population than the other treatments. Application of aqueous garlic extract at the rate of 10 g/50m1 recorded the highest reduction in root galling and egg mass index. Application of 30 g/50m1 aqueous garlic extract resulted in a significantly higher (p=0.05) fruit weight, as well as number of fruit per plant. However, there was no significant difference observed in the growth parameters between the treated plants. It is therefore recommended that 30g/50m1 of aqueous garlic extract should be evaluated in the field to optimize the production of tomato.