Ask a Question forum: Immature Watermelon Rot - Black Spots

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Nov 29, 2016 4:30 AM CST

I'm relatively new to vegetable gardening, this being only my second season with various veg.

This is my second season in a row where all my watermelons rot off before developing more than 1.5 inches. I've searched everywhere on the net but can't find symptoms that match what I have been experiencing. I'm growing my watermelons on trellis and thus they don't touch the soil. I started spraying pesticides and fungicides last week (2 months after planting). Last year (I didn't spray anything) my cucumbers and zucchini also showed similar signs which left me with no crop of either. I live in a dry and hot summer climate and water daily via a drip irrigation system feeding the plants with organic liquid fertilizer (seagull guano).

I've attached pictures of the fruit and the leaves.

Please help!!
Thumb of 2016-11-29/FigoFeliciano/922fbd
Thumb of 2016-11-29/FigoFeliciano/71cb55
Thumb of 2016-11-29/FigoFeliciano/3b3425
Thumb of 2016-11-29/FigoFeliciano/2c8002

Name: Philip Becker
Fresno California (Zone 8a)
Nov 29, 2016 12:04 PM CST
Looks like some kind of borer.
Spray with some neem oil. Its safe .
Its systemic. So takes a little time to work. Its suppose to be good for a month i believe.
😎😎😎 Welcome! I tip my hat to you.
Anything i say, could be misrepresented, or wrong.

Nov 30, 2016 12:22 AM CST
Hi Philip thank you for your reply!

I had a look at my watermelons yesterday afternoon and found this little bugger laying eggs in the fruit.
Thumb of 2016-11-30/FigoFeliciano/60e5d4

I have neem oil, will start spraying today!

Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
Region: Canadian Keeps Horses Dog Lover Plant Identifier Garden Sages
Nov 30, 2016 5:04 AM CST
Welcome! @FigoFeliciano - what country do you live in? Your picture resembles the melon fruit fly, Bactrocera cucurbitae, which is not supposed to occur in the USA except for Hawaii and appears to be a pest of concern if it shows up. Here's an article about it:

Having said that, I don't see a black mark at the bottom of the wing where the pictures of it show there should be one, so it could be a different related fly.

[Last edited by sooby - Nov 30, 2016 5:24 AM (+)]
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Name: Philip Becker
Fresno California (Zone 8a)
Nov 30, 2016 11:40 AM CST
Good investigation Figo !
You even caught a picture of the little devil 👿 !!!
Anything i say, could be misrepresented, or wrong.

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