Effect of Chemical Dazomet on Controlling of Tomato Root-knot Nematodes

Key words: 
• tomato /
• Meloidogyne incognita /
• 98% dazomet MG /
• nematicide

Abstract: Field experiments were conducted to control tomato root-knot nematode（ Meloidogyne incognita） in the field by applying 98% dazomet MG at three rates,300 kg·hm^-2,375 kg·hm^-2 and 450 kg·hm^-2,and the controlling effect was evaluated based on the number of 2ndinstar larvae in the soil and the root knot index.The 2ndinstar larvae number of the tomato root-knot nematodes was reduced by 91.74% and 82.80% in the soil treated with dazomet at 450 kg·hm^-2 at 30 and 60 days,respectively,and by 73.81% in the soil treated with dazomet at 375 kg·hm^-2 after 60 days,which shows that dazomet has better controlling effect and long persistence.At the end of harvesting,the treatments with dazomet at these three rates had a controlling effect of above75%,the highest 86.14%,showing the dazomet has a good control of tomato root knots.The application of dazomet into the soil at the rate of 375—450 kg·hm^-2 is recommended.Dazomet should be applied selectively at a given rate based on the application method and environmental factors in line with the field conditions.