Early blight caused by Altermariasolani (Ellis) is an economically important fungal disease of tomato (Lycopersiconesculentus Mill) with yield loss ranes 5-78% in unsprayed plots. A field experiment was carried out National Horticultural Research Institute (NIHORT), Ibadan, in 2012 to evaluate 5 synthetic fungicides (Marcozeb 75 a.i. Carbendazim 80 a.i. Chlorothaloni) 90 a.i. Carbondazim 500 a.i. Chlorothalonil 90 a.i.) for the management of tomato blight in order to determine the effective dosages of those fungicides against Early blight under field conditions. The experiment was arranged in a Randomized Complete Block Design with three replications at 1L, 2L and 3L/ha. Application of treatment was done at weekly intervals, plants with no application of fungicide was used as the control while those with FunguForce® (Muncozob 63% Carbendazin 12.3WP), served as standard check. Early blight infection were prevalent in the experimental year and up to 98 and 80% disease incidence and severity was recorded at (P<0.05). Although there were significant differences in the yields obtained, the highest of 0.87kg/ha was recorded on plants treated with 2L/ha Chlorothalonil 90 and 0.07kg/ha observed on plants that received 3L/ha Carbendazim 80 as the lowest. At six weeks after transplanting, all the tested fungicides gave comparable reduction in disease incidence at 2L/ha with the standard check at the recommended rate. Although, the yield obtained was low due to high severity of the disease, the tested fungicides showed great potential in the management of early blight of tomato on the field.
Tomato late blight, fungicides, effective dosage, yield potential