Cucumbers Die once they begin producing
This is my third year gardening in Oregon after moving from Iowa. I gardened there easily for 10 years with great success. My first issue I'd like to address is that my cucumbers seem to grow beautifully until they start producing fruit. I get a few lovely cukes and then I begin seeing yellowing and dying stems and leaves. Everything goes downhill from there! This process is happening again this year! Pests? Soil deficiency? I added my beautiful compost at the beginning of the season and everything else seems healthy except maybe the pumpkin is turning early.
Clackamas County Oregon cucumbers
The weather is the main culprit. They prefer sustained heat and we have not had that to help with pollination and fertilization. If the fruits start to develop and fail it is usually do to poor pollination or pollination without fertilization. Here is some additional information on the subject:https://extension.oregonstate.edu/news/mother-nature-may-need-help-pollinate-squash-cucumbersre
https://hortnews.extension.iastate.edu/2002/4-5-2002/cucumbers.html The weather is also likely contributing to the mildew you are seeing. Some varieties are more susceptible than others but also cool wet weather lends itself to this disease.https://pnwhandbooks.org/plantdisease/host-disease/cucumber-cucumis-sativus-powdery-mildew Thanks, for your question.