Method for preventing and treating tobacco root knot nematode disease by crop rotation planting of tillered onion and tobacco

The invention belongs to the technical field of plant protection, and particularly relates to a method for preventing and treating tobacco root knot nematode disease by crop rotation planting of tillered onion and flue-cured tobacco, which comprises the following steps: planting and managing according to a tillered onion planting technology in a planting field from late September to middle October in the first year; after tillering onions are harvested in early and middle April, soil is deeply ploughed in time, impurities of the soil are removed, the obtained soil is aired, and then cultivation and management are conducted on the treated soil according to a planting field flue-cured tobacco cultivation technology. When the tillered onion and the flue-cured tobacco are subjected to crop rotation planting in specific time, the insect killing rate of tobacco root-knot nematode larvae is 63% or above, and the tobacco root-knot nematode prevention and control efficiency is 73% or above. Green prevention and contro