EL-SHEHABY, A., RADWAN, I., HUSSIEN, F., KORAYEM, S., TADROUS, M., AZAB, M. (1995). EVALUATION OF FUNGICIDES FOR CONTROLLING DOWNY MILDEW AND PURPLE BLOTCH DISEASES OF ONION. Egyptian Journal of Agricultural Research, 73(4), 913-924. doi: 10.21608/ejar.1995.442865
ABDAL-LAA I. EL-SHEHABY; IBRAHIM A. RADWAN; FATHY N. HUSSIEN; SALAH KORAYEM; MICHAL F. TADROUS; MOHAMED W. AZAB. "EVALUATION OF FUNGICIDES FOR CONTROLLING DOWNY MILDEW AND PURPLE BLOTCH DISEASES OF ONION". Egyptian Journal of Agricultural Research, 73, 4, 1995, 913-924. doi: 10.21608/ejar.1995.442865
EL-SHEHABY, A., RADWAN, I., HUSSIEN, F., KORAYEM, S., TADROUS, M., AZAB, M. (1995). 'EVALUATION OF FUNGICIDES FOR CONTROLLING DOWNY MILDEW AND PURPLE BLOTCH DISEASES OF ONION', Egyptian Journal of Agricultural Research, 73(4), pp. 913-924. doi: 10.21608/ejar.1995.442865
EL-SHEHABY, A., RADWAN, I., HUSSIEN, F., KORAYEM, S., TADROUS, M., AZAB, M. EVALUATION OF FUNGICIDES FOR CONTROLLING DOWNY MILDEW AND PURPLE BLOTCH DISEASES OF ONION. Egyptian Journal of Agricultural Research, 1995; 73(4): 913-924. doi: 10.21608/ejar.1995.442865
EVALUATION OF FUNGICIDES FOR CONTROLLING DOWNY MILDEW AND PURPLE BLOTCH DISEASES OF ONION
1Plant Pathology Research institute, Agricultural Research Centre, Giza, Egypt
2Mallacy Agricultural Research, Agricultural Research Centre, Mallaoy, Minea, Egypt
Abstract
Efficacy of 10 fungicides was tested for controlling downy mildew caused by Peronospora destructor (Berk.) and purple blotch caused by Alternaria porn (Ellis) on onion. Seed onion trials were carried out at Kaha, Sids and Mallawy Experiment Stations from 1987 through 1989. Trials of bulb onion were done at Sakha and Mallawy Exp. Sta. from 1988 through 1990. Reduction in disease incidence and increase in seed and bulb yield over non-treated control were used to determine the efficacy of fungicides tested. All fungicides were foliar sprayed at the rate of 250 g / 100 L except Sandofan M8 (200 g/100 L) and Galben Mancozeb and Galben Copper (1 50 g/100 L). Fungicide sprays were started 45 days after planting and repeated every 15 days till harvesting. Ridomil Mz 72% (metalaxyl 8% + mancozeb 64%) and Ridomil Mz 58 (metalaxyl 10% + mancozeb 48%) were the most effective fungicides reducing disease on seed and bulb onions by 86%, and increasing seed and bulb yield over control by 194% and 199%, respectively. Sandofan M8 (oxadixyl 8% + mancozeb 56%) was also effective against these pathogens giving 76% and 79% reduction in disease severity on seed and bulb onions, respectively, and 137% increase in seed and bulb yields over control. Ripost M 67.2% (Oxadixyl 8% + mancozeb 56% + cymoxanil 3.2%). Galben Mancozeb 58% (benalaxyl 10% + mancozeb 48%) and Sandocur C (oxadixyl 6.9% + mancozeb 48% + cymoxanil 14.2%) exhibited 64-73% reduction in disease incidence and resulted in 82-111% increase in seed and bulb yield, except Ripest M 67.2% with seed onion which increased seed yield by 139% over non-treated control. Comaprop 50% (zineb 10 % + propineb 10% + copper oxychloride 30%), Comazin 50% (zineb 10 % + maneb 10% + copper oxychloride 30%), Galben Copper 46% (benalaxyl 11% + copper oxychloride 35%) and Mika! M 70% (Phosetyl - Al 44% + mancozeb 26%) were less effective and reduced disease by 47-58% on seed and bulb onions with up to 81% increase in yield over control.
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