As bunching onion in Colombia is propagated asexually, the material with less days to harvest or which is precocious is preferred over the less precocious one because it allows harvesting several times during a year.
Based on the average yield of 13 t x [ha.sup.-1] calculated for bunching onion in Colombia, these materials are a very promising alternative to the ones currently used.
These values were found to be higher than in previous evaluations carried out in bulb onion by Wall and Corgan  and in bunching onion by Levine et al.
These results are interesting because fresh bunching onion market is very much an uncontrolled supply and demand scenario of an inelastic product; that is, there is always an uncertain price paid to farmers.
The most limiting bunching onion diseases in the Boyaca region are downy mildew (Peronospora destructor) and the root rot (Burkholderia cepacia-Ditylenchus dipsaci complex).
Our experiment proceeded in a wet wire drawing shop or also said in a fine drawing shop and ropery at bunching of SC.
As it can be seen from previous figures the quality and workability of drawn wire at bunching process expressive varied especially at the wires from groups A13 and B 13.
The consequence of dies wear was that the drawn wire had a surface with grooves which caused fractures at the bunching process.
The occurrence of extreme wires was registered at the bunching on double twisted machines in the certain production phase.