This is my first time growing vegetable plants and they seem to be stressed. I planted everything on May 19. The corn is yellowing, and small leaves are dying. The tomato plants have limp leaves and there’s some browning. The bean leaves have holes, and the plants look like they’re dying. There’s a white substance the cucumbers. Why is this happening?
Judging by your photos, all of the plants look like they are deficient in one or more nutrients. Have you had a soil test? This is the best way to determine what is in your soil and get advice about which nutrients are needed and importantly, how much. OSU Extension recommends a laboratory test when starting a new garden to set a baseline for amendments and fertilization.
I hesitate to recommend fertilizing without the benefit of a soil test because your soil seems to be seriously deficient in plant nutrients and/or the soil pH may not be appropriate. Undernourished plants are more susceptible to pests and diseases. However, if you choose to forego a soil test, you can use a fertilizer formulated for vegetables, and apply it exactly as directed on the label.
OSU Extension does not offer soil testing services, however, here is some information that may be helpful:
- A Guide to Collecting Soil Samples for Farms and Gardens
- Soil Testing Lab Selection and Recommended Analytical Methods for Oregon
- Get Actionable Results from a Soil, Plant or Environmental Testing Lab
- Soil Test Interpretation Guide
With regards to your cucumbers, cucurbits are very susceptible to powdery mildew. Powdery mildew can generally be avoided by planting resistant varieties, planting in full sun, and ensuring adequate air circulation around and through plants. Sprays are available, but given the stressed condition of your plants, I would suggest avoiding chemicals.
Growing Your Own is a comprehensive guide for home gardeners that would help you.
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