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Virginia

Plant 1: https://imgur.com/8Ts7gF7
Plant 2: https://imgur.com/UmSjNoj

What could be causing this?

No pests that I can see and plant is generally healthy although older leaves are yellowing at a fairly quick rate.

These are Atlantic giant seeds. Soil is Miracle Gro in-ground soil amended with leaf compost and worm castings. I keep it on the dry side, watering only once soil becomes dry 1.5-2in down.

Any help would be appreciated! I am a newer grower desperate to save my plants!

7/11/2020 1:07:54 PM

Western PA

I would pull all that mulch away from the stump . Next, i would scrape with a clean knife all the brown rot away, then scrub with a little bleach water. Get a fan on the wounds and run 24/7 until it is totally dry.

The first pic may be that you have squash vine borers in the vine. If it looks like wet saw dust in the wounds , i would say that is your issue.
Have you treated your plant with a systemic insecticide ?
If not you will want to do that.

7/11/2020 1:16:39 PM

Virginia

ZAPPA thank you for your quick reply.

I will definitely make those changes. Do you have a recommendation for a systemic insecticide I can find on amazon?

Much thanks,
Ryan

7/11/2020 1:46:51 PM

Virginia

As ZAPPA suspected, the first plant has squash vine borers.

Video: https://imgur.com/a/oypUctq

I found two larva and pulled them out, soaking the step in 1:10 bleach-water and put a fan on it.

If anyone has advice, I would be very grateful.

7/11/2020 3:28:11 PM

Partlow,Va

Bayer Tree and Shrub has the systemic active ingredient you need and can find it locally. Water it in and it will be taken up by the roots

7/11/2020 3:47:09 PM

Syracuse, NY

Would that be Imidacloprid? If so, be sure to check if that works on SVB (Squash Vine Borers) - it works on Cucumber beetles and a lot of others, but the SVB is a moth larvae rather than a beetle and thus we MAY need a different tool against them - i am not certain, but a little bell just went off - good luck---eg

7/11/2020 7:06:15 PM

Dillonvale, Ohio

Yes, imidacloprid does work on SVB

7/11/2020 10:52:57 PM

Eastern Pennsylvania

Imidacloprid 75 WSB Generic Merit 75 WSB 4 x 1.6 oz bags https://www.amazon.com/dp/B00C4Y2774/ref=cm_sw_r_cp_api_i_.-VcFbNCMHEN9

6.4 oz imidacloprid 75wp for $30. Enough to keep SVB away for years.

7/12/2020 8:22:27 AM

South Dakota

If the rot is moving, a systemic fungicide may be in order. I use Organocide, a phosphite, translocates into the roots and all other plant parts. Murder on Myco, but if you need to save the plant, it is worth it.

7/12/2020 8:46:45 AM