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Septoria Resistande: it may be a common property of all S. habrochaites lines.
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Most Habrochaites are susceptible to septoria to varying degrees. A few Habrochaites lines are highly resistant. The resistance often seen in rootstocks is from rampant growth together with high alkyl production. It won't hold up under heavy fruit production in a typical edible tomato genetic background. LA2175 has a high degree of genetic resistance that is transferable to domestic tomato. It just takes a lot of generations of growing plants to eliminate most of the genetic drag from Habrochaites.