Unique black spot resistance gene from 'George Vancouver' is better characterized

Grand Amore comes from a long line that breeds triploids, so it would not be surprising. Downy can be annoying on in every 3rd year or so. In our infamous “Oregon wet springs”. It’s an otherwise very easy keeper as far as HTs go. I don’t feel like it has any special resistances though. It’s basically “strawberry red ,Touch of Class-like, without the powdery” sorta deal.

I tried sourcing Champion Sunblush. First, they sent me Champion Red labeled Champion Sunblush that they swore was Oso Easy Double Red… Now, they cannot legally send Sunblush as its container size is against my state law. I was going to test it out to see if it has Brite Eyes’ special resistances. I will be receiving Peach Lemonade against my will (it came with free shipping IF I ordered it.), but I doubt it carries the same level of health as Brite Eyes, as it seems distantly related. I did get a semi-dwarf out of Cancan, with its unique color, but could not breed out the horrid level of downy from it. It’s also distantly related. I intended to breed double semi-dwarfs out of Brite Eyes, but I’ll be honest. I’m TIRED of shrinking giants down to proper garden size. I really had hoped Sunblush would be an easy one and done pollen parent for those resistance types. The entire bunch are sorely lacking in bloom aesthetics, except for some color shifting. Singles are a real pain to breed out, as are washed out colors. It’s a lot of hurdles for something to be remotely commercial.

Could someone explain in laymans terms what horizontal and vertical resistance means. Sorry amateur here…

In simple terms, horizontal would be like general resistance to something, and vertical would be like specific sub-resistances of a specific disease.

It’s not quite accurate, because there is a ton of nuance/unannounced tangents, but that’s the easy way.

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I’ve had luck with Grande Amore as a seed parent…I do remember the first year I got nothing but as the plants have matured, they are working. Have several crosses but too early to tell how resistant they are.

James, another way to think of it is “horizontal” = broad resistance (i.e. to multiple strains) and vertical is “deep” or strong resistance (but to a limited strain(s)).

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The way I originally read it explained was, horizontal resistance is a combination of multiple genes providing combined resistance. Vertical is one gene replicated which provides good resistance until the fungus over comes it. The horizontal resistance can provide a greater resistance as it requires overcoming more than one gene. Vertical can be strong, as in the case of Baby Love, which appeared to have very high resistance, until it didn’t and began defoliating and collapsing.

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So is vertical still worth it as an aim if it eventually falls down, or is that too basic an idea to think of it that way? Would horizontal resistance prevent vertical resistance eroding over time?

It would seem that horizontal might be the more durable, but likely not as complete, at least until it’s overcome. Combining both would also seem the ideal.