EVALUATION OF SOME FUNGICIDES FOR THE CONTROL OF EARLY BLIGHT DISEASE (ALTERNARIA SOLANI) OF TOMATO (original) (raw)

Five fungicides including Score, Cabritop, Carbofuran, Carbendazim and Aliette were evaluated for their efficiency against Alternaria solani under laboratory, greenhouse and field conditions. The fungicides Score, Cabritop, Carbendazim and Aliette decreased the growth of A. solani at the concentration of 0.5, 1, 3, 5 and 7μg. mL-1. The fungicides Score and Aliette reduced the spore germination of A. solani at the concentrations of 0.5, 1 and 3 μgml-1. Effect of Cabritop was not significant at low concentration (0.5μg.mL-1) but it had significant effect at higher concentrations compared to positive controls. The fungicides Score, Cabritop, Aliette and Carbofuran at the concentration of 3μg.mL-1 , significantly reduced disease severity by 50, 50, 40 and 60% (as per scale), respectively compared to the +ve controls. The fungicides Score and Aliette were further checked in greenhouse and field experiments and found adequately effective against A. solani. Both the fungicides Aliette and Score significantly increased the number of leaves, stem and root length, stem fresh weight and root fresh weights, stem dry weights and root dry weights over positive controls, while growth of negative control (water control) was, in general, substantially higher compared to fungicide treatments. Whereas, pigment contents (Chlorophyll a, b and carotene) were high in the order:-ve control > Score > Aliette while, pigment levels were substantially lower in +ve control.