Higher density trays tend to be more durable and have a longer useful life than low density trays, but they also tend to be more expensive. Most trays used in tobacco float systems are made of polystyrene and manufacturers control the density of the tray by the amount of material injected into the mold. Some growers may utilize more than one system for example seeding in a heated greenhouse and moving plants to an unheated bed after germination. Table 1 shows a relative comparison of these three systems. Each of these systems has its advantages and disadvantages, but all can be used to produce quality transplants. If you choose to purchase transplants consider working with a local producer to minimize the risk of introducing disease and to help stimulate the local farm economy, or buy plants produced in areas north of Kentucky (where blue mold is unlikely to be present).įor growers who choose to produce their own transplants there are three general systems to consider: 1) Plug and transfer in unheated outdoor float beds, 2) Direct seeding in unheated outdoor float beds, and 3) Direct seeding in heated greenhouses. When infected transplants are brought in, blue mold “hot spots†can develop rapidly and greatly accelerate the problem, costing growers money in lost production and increased control measures. Blue mold does not overwinter in Kentucky, and is typically spread into our area on wind currents from southwestern source areas. One example of this principle is with the potential for blue mold on transplants grown in the Deep South. Transplants may be infected with a disease even though they appear healthy at the time of delivery. There are risks associated with transporting transplants over long distances. Transplant buyers should consider carefully the reputation of the transplant producer, ask questions about their management practices, and carefully inspect transplants upon delivery. This does not mean that purchased plants are always better quality than you can grow yourself. Growers who derive a significant portion of their farm income from transplant sales tend to spend more time managing their float facilities than growers who grow transplants only for their own use. For some the best decision may be to purchase transplants and allow someone else to absorb the risks of transplant production. Most tobacco growers have the knowledge and skills neces sary to grow good quality transplants, but many do not have the time to do the job right.
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