Collecting seed from a TMV infected plant:
The research that I have read on the subject concludes that TMV is not transmitted by clean tobacco seed. It can, however, be transmitted by debris (chaff) from the seed pod. So, the seed must be carefully cleaned of chaff, before storing it. It should look like pure, finely ground coffee, with no bits of lighter-colored material.
TMV remains active in the soil, once it's there. Crop rotation with a non-solanaceous species (tobacco, tomato, pepper, eggplant, potato) helps. Ideally, a rest period of 3 years before replanting with one of these susceptible species will significantly reduce the virus in the soil.
If you harvest the leaf, it will remain infective, even after curing. But growers of any susceptible plants should always assume that smoking tobacco, even commercial smoking tobacco, contains TMV. Since most gardeners as well as tobacco growers usually ignore this warning, the transmission rate from finished tobacco must be relatively low.
Bob
The research that I have read on the subject concludes that TMV is not transmitted by clean tobacco seed. It can, however, be transmitted by debris (chaff) from the seed pod. So, the seed must be carefully cleaned of chaff, before storing it. It should look like pure, finely ground coffee, with no bits of lighter-colored material.
TMV remains active in the soil, once it's there. Crop rotation with a non-solanaceous species (tobacco, tomato, pepper, eggplant, potato) helps. Ideally, a rest period of 3 years before replanting with one of these susceptible species will significantly reduce the virus in the soil.
If you harvest the leaf, it will remain infective, even after curing. But growers of any susceptible plants should always assume that smoking tobacco, even commercial smoking tobacco, contains TMV. Since most gardeners as well as tobacco growers usually ignore this warning, the transmission rate from finished tobacco must be relatively low.
Bob