Gardening and Horticulture - What caused this black spot on the watermelon
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mobile_man
07-26-08, 10:17 AM
Located in Mobile, Alabama. First time growing watermelons. This black spot appeared on the watermelon. Then it grew. For reference, pocket knife is 3.5 inches. It looks like insects of some kind, but I don't know what. We've sprayed with Bt on the watermelons. What would cause this?
http://www.fireshadow.net/pictures/albums/userpics/normal_DSCF0790.JPG
http://www.fireshadow.net/pictures/albums/userpics/normal_DSCF0790.JPG
Newt
07-27-08, 08:31 PM
Hi Mobile Man,
It looks like blossom end rot. Scroll down here at the bottom of the page. It's under 'Diseases' and then 'Malformations'. There's also a picture.
http://www.uga.edu/vegetable/watermelon.html#diseases
Blossom End Rot occurs more readily in oblong melons. Caused by a deficiency in calcium either in the soil or by a lack of water availability for Ca uptake and movement. Prevent by liming and providing adequate supply of water.
Newt
It looks like blossom end rot. Scroll down here at the bottom of the page. It's under 'Diseases' and then 'Malformations'. There's also a picture.
http://www.uga.edu/vegetable/watermelon.html#diseases
Blossom End Rot occurs more readily in oblong melons. Caused by a deficiency in calcium either in the soil or by a lack of water availability for Ca uptake and movement. Prevent by liming and providing adequate supply of water.
Newt