I have a garden patch of squash and cucumbers and Ive noticed on a few plants, not all that they have a couple of yellow brown leaves. They are all on a 1 gallon drip and on a timer. They come on at 6am for 75 minutes and then I go out in the afternoon about 3 and if it's a warm day I may turn them on for another 30 minutes. We just had a very hot period here of about 7 days that were around 89 to 95 degrees but now it has backed off. Today I was pulling out weeds and I noticed that most of the plant bowls seem very moist. I have some pictures:

[IMG]http://i1204.photobucket.com/albums/bb405/Cobalt1254/Mobile%20Uploads/2016-06/IMG_20160615_094437_zpsqa4jezc6.jpg[/IMG]

[IMG]http://i1204.photobucket.com/albums/bb405/Cobalt1254/Mobile%20Uploads/2016-06/IMG_20160615_094430_zpsnoygr0hu.jpg[/IMG]

[IMG]http://i1204.photobucket.com/albums/bb405/Cobalt1254/Mobile%20Uploads/2016-06/IMG_20160615_094445_zpswekfyzbi.jpg[/IMG]

Any help would be appreciated.