CannaTech
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This is not a new thing imo. To think it just popped up is not the case, it seems growers have been dealing with it for some time just not always described as such or called duds.
@Spider- As stated earlier in the posts- it doesn't spread. Ive had perfectly healthy plants dud a few branches in flower from what I believe to be stress. Like i already said as well- no mites, no issues, etc. Doesn't spread from a dud veg plant to any others either. The veg duds i talked about spotting were a total of 2 plants and 1 I received already looking dud. In flower the plants I describe dud'ing have been a total of 5-6... over how many years?
The reality is growers have been dealing with it for some time, what most growers do is just throw that plant away or write it off- oh well. Prior to the topic coming up i would say fuck it, genetic drift etc because there is "0" consistency, it never spread, and rarely ever repeated itself. Now that its a topic of concern more people are talking about it and realizing certain genetics etc are more prone to do it. Definitely will be helpful to figure out the cause.
Last dud branch i found in flower was on a perfectly healthy wifi27, the branch simply was hidden under the canopy and received little to no light until i spotted it late in flower- just one branch that obviously was stressed and in evidently dud prone genetic. So that plants was 100% healthy going in and coming out- even threw down some of best bud that round. Just random mystery dud action.
In the world of genetics plants and animals alike can have late coming gene expression. in other words, it is possible for this plant to start expressing specific genetic mutations in later parts of its life. If this is happening to a high % of the clones from your mother I would suggest flowering out the mom and being done with the strain. If your mom does it, there is your issue.
Its not uncommon to get mutations that occur in this manor. The reason why it is so rampant is due to so many people back crossing with the same genetics. It is more than likely a recessive trait it had received (by any number of its parents) that gets triggered by an environmental factor.
If you like your strain and do not want to give it up, try crossing it with some better genetics and breed the recessive trait out. Although it could be a dominant trait within this genotype and there for it will take quite a bit of crossing to get rid of it. So, you will want to cross it with a plant that had good genetics atleast 3 generations to make sure that the gene expression is gone.(3 times will not remove it, it will only make it even more recessive. It takes a LOT of crossing to get it out of the gene pool)
My suggestion would be talk to other farmers and get a genetics list going of dudded plants and find the culprit strain that muddied down your genetics. in Wifi I would assume it came from The White's side of the family. Aka Triangle Kush,
Hope that helps.