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Saturday, July 15, 2023 Matt D. Connecticut

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Leaf Margin Burn Issue: Tissue Tests in and Summary of Observations

Leaves near the pumpkin started to show some yellowing of the margins. This looked like a classic potassium deficiency so some sulfate of potassium (0-0-50) was added via drip tapes (~400ppm or 0.6 EC) however conditions seem to still progress.

The original thought was the pumpkin was taking in the potassium resulting in a deficiency however, looking at the tissue test result there are no major deficiencies present for any nutrient. In addition, the tissue test results showed excessive potassium and nitrogen.

The images show mainly the leaves near the pumpkin with two secondaries past the pumpkin (at the moment) showing the most yellowing progression. The secondary showing the most yellowing is a weak one that is below the main canopy and is shaded.

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