Tobacco plants are damaged severely when infested with Meloidegyne incognitia

a. Tobacco plants are damaged severely when infested with Meloidegyne incognitia. Name and explain the strategy that is adopted to stop this infestation.
b. Name the vector used for introducing the nematode specific gene in tobacco plant.

a. Nematode specific gene introduced into host plant produced dsRNA, RNAi initiated, specific mRNA of the nematode silenced and parasite dies.
b. Agrobacterium tumefaciens