Author Archive | Bill Whitson

cvossi2015full

Five Favorites

I breed 16 species seriously, meaning that I am actually able to make progress and either already have or anticipate eventually releasing new varieties. I work with another 21 species either prospectively, meaning that I would like to breed them but haven’t managed to get them to reproduce sexually, or on too small a scale […]

Continue Reading 0
Plant_cell_structure

Potato: A Cytoplasm Primer

If it has been a long time since high school biology and you are rusty on the concept of cytoplasm, you can be forgiven.  It’s not something that most of us think about very often, but it is important to potato breeding, so let’s review. Cytoplasm is everything that is inside a cell but outside […]

Continue Reading 0
potato-berries-on-plant

Potato: What You Should Know About Fruits on Your Potato Plants

In 2017, many areas of the US have experienced unusually wet and cool weather.  As a consequence, a lot of people have reported seeing something unusual: potato berries.  They look like small, usually green tomatoes growing on your potato plants.  These are known variously as seed balls, potato apples, potato tomatoes, or simply as berries, […]

Continue Reading 1
tps-mix-tetraploid

Potato: Color Genetics

For many crops, you don’t have to search very far to find a nice summary chart of the major genes involved in economically important traits.  This kind of information makes breeding decisions a lot easier.  Knowledge of the genetics underlying traits allows the breeder to identify varieties that are homozygous for a particular trait and […]

Continue Reading 0
gccpotato

Potato: A Ploidy Primer

Introduction How Seeds are Formed Domesticated and Wild Potatoes Ploidy Monoploid and Haploid Numbers Haploids Interactions of Ploidy in Crosses Unreduced (2n) Gametes Endosperm Ratio Endosperm Balance Number A Final Note on Probability Determining Ploidy Morphological Evalutation Guard Cell Counts Chromosome Counts This is probably not a finished work yet.  I have been puttering away […]

Continue Reading 1
Made using TurboCollage from www.TurboCollage.com

Ulluco: 2016 Wrap Up

Unveiling new ulluco varieties is starting to become a little routine.  Oh well, there is really no rut that I would rather be stuck in. I reached a peak of 44 ulluco seedlings this year.  25 of them died, were culled due to obvious disease, or failed to set any tubers.  19 survived to the […]

Continue Reading 2

Cultivariable will not open for sales in 2017. We will be back in 2018. For more information, read the notice at the top of our home page. Dismiss