This time of year, I get many kind of complaints of pumpkin plants with yellow leaves. Tright here deserve to be many type of factors why pumpkin plants have actually yellow leaves. The the majority of widespread reason for yellow pumpkin leaves doesn’t have anypoint to carry out through an illness that deserve to spreview from plant to plant. Generally, the factor for the yellow pumpkin leaves hregarding carry out through lack of water, weather that has been also hot, nutrient deficiency or other stresses. The photos and conversation listed below will, I hope, illustrate my allude.

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Let’s say you have actually a pumpkin field wright here you have pumpkin leaves that are yellow and also you are wondering about the reason. You may want to ask yourself, which leaves are yellow and also where are they yellow.

In Figure 1, yellow pumpkin leaves might be oboffered. When one looks a little closer to discover out wright here the yellow leaves are, one can see that the yellowing runs down the row. In fact, it is the older leaves that are yellow (Amongst plant biologists, we choose the term chlorosis to yellow. But I will certainly continue to usage the word yellow right here.) When older leaves are yellow and also the younger leaves show up green and also healthy and balanced, the factor for the yellowing is commonly stress-associated, as shown over. I am not also worried around this type of yellowed pumpkin leaves.

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Figure 1. The yellowing of these pumpkin leaves appears to run dvery own the row.

Look again at figure 1 to attempt out which part of the leaves are yellow. For the a lot of component, the percentage of the leaves that are yellow are the edges (or margins) of the leaves (Figure 2). One doesn’t see entire leaves that are yellow. The yellowing doesn’t appear in the interior of the leaves. Yellowing on the exterior of the leaf normally means that the factor is tension connected as debated over.

Older leaves tend to come to be yellow through time bereason nutrients choose nitrogen are mobile in the plant and will move to the younger leaves wright here they are essential. In enhancement, the edges of leaves might end up being yellow because the edges of leaves have actually pores wright here sap (known as the water of guttation by botanists) is secreted at night. This sap may have a mildly toxic effect on the leaves over time—this is the factor that the edge of older leaves may end up being yellow.

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Figure 2. The edges of this pumpkin leaf are yellow, the majority of likely as a result of eco-friendly stress and anxiety.

In figure 3, the yellowing of the pumpkin leaves is more generally over a larger location in contrast to figure 1 wright here the yellowing might be watched to run down a row. Most of the yellowing shows up in the foreground of the photo in number 3. If one looks down the hill, the leaves show up green and healthy and balanced. Now, let’s look at the soil beside the symptomatic pumpkin leaves. The soil appears sandy.

Next, we will certainly walk down the hill wbelow the pumpkin leaves are green and look earlier up towards the yellowed pumpkin leaves (Figure 4).

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Figure 3. This watch is from the optimal of the hill looking down. The pumpkin plants in the foreground of this photos have actually yellow leaves. The soil is sandy at the peak of the hill.

Aacquire, we notification that the location on top of the hill is in a basic area—they don’t seem to run down a row. That is, it isn’t simply the older leaves that are yellow. Now, take a look at the soil alongside the green pumpkin leaves at the bottom of the hill. The soil is much heavier with more of a clay content than the soil at the height of the hill.

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Figure 4. This see is from the bottom of the hill looking up. The pumpkin leaves at the bottom of the hill are primarily green and also healthy and balanced. The soil at the bottom of the hill is reasonably heavy.

The leschild below is that the pumpkins at the top of the hill had actually much less accessibility to water than the bottom of the hill. This is true both because hills tend to be much better drained and also because sandier soils hold less water. The grower had drip irrigation in location, yet was not able to pump a lot water due to lack of water in a surconfront pond. Therefore, the yellowing leaves at the height of the hill are because of drought stress.

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Both of the areas of pumpkins pictured here produced excellent crops. The yellow on the pumpkin leaves does not necessarily indicate a disaster or a condition is in the future.

I hope the photos and also conversation presented below will certainly aid one to number out what is wrong in one’s pumpkin patch. However before, if one still has questions about symptoms, it is best to send off a sample to a diagnostic laboratory. Purdue University’s Plant and also Pest Diagnostic Laboratory is a terrific resource


 — Purdue University Clinical Engagement Associate Professor Dan Egel

This column was initially published in the August edition of Purdue Unversity’s Vegetable Crops Hotline newsletter.