The watermelons that I had planted wilted, and some have dried up while developing the fourth leaf. What might be the cause, and which ways can I control the problem?
Certified GKH Gardening Expert
This could have happened because of a watering problem- either the seedlings got too little water, or they were overwatered in poorly drained soil, which can "drown" the roots. Check to make sure your soil is well-drained but does have some water holding capacity.
Or, a fungal disease could be responsible: