Experiment in the Bactericide Effect with Low Poison and Low Residue on the Control of Tomato Disease

To screen the bactericides with low poison,low residue and high efficiency to replace the low-effective bactericides or to use in alternation with the long used bactericides.Mancozeb M-45,iprodione and mancozeb were used to conduct the experiment of bactericide effect on tomato diseases in plastic shed.The effects of controlling tomato late blight and leaf mold by 3 kinds of bactericides were mancozeb M-45 iprodione mancozeb and the effects of controlling tomato grey mould and early blight were iprodione mancozeb M-45 mancozeb.Mancozeb had lower effects of controlling on tomato grey mould and late blight,being only about 22.1% and 51.8% resp ectively.and higher effects of controlling on tomato leaf mold and early blight,being 81.5% and 75.8%,resp ectively.Mancozeb M-45 and iprodione could be used to replace mancozeb in controlling tomato grey mould and late blight.The controlling effects of mancozeb on tomato leaf mold and early blight was lower than that of mancozeb M-45 and iprodione,but mancozeb was cheap in price and had higher controlling effect,so mancozeb M-45 or iprodione could be chosen to use in alternation with mancozeb in controlling on tomato leaf mold and early blight.