Hey, so i have this cucumber plant that was doing fine until a couple of days ago where the leaves started to droop and the bottom ones turned yellow. I thought this may be due to a lack of water as i hadn't watered it for a few days so i gave it a water and in the evening it did perk up a bit, however this morning it was back to droopy and yellow leaves. I thought maybe it as a problem with the put so i moved it out, washed all the soil off to see if there was root rot and there didn't seem to be. I was wondering if theres another problem i might be missing, this is how it looks at the moment.

Any help is appreciated, this is my first year growing so am very new to this

 Baked sea bass with a very few chips peas, pineapple and creme fresh 

Macaroni cheese.  We needed to use up the milk we had (I am lactose intolerant but know how much I can have). 

One thing to remember is that you need to water according to the conditions. So, don't assume you just water every (for example) two days. In very hot weather, the plants will lose more water from their leaves and the compost, and you might need to water once a day or more often.

The aim is to maintain soil / compost that is moist but neither waterlogged nor dried out. It's inconsistent watering levels that will cause problems like those you mention.

Are they in pots or in the ground?

 Deltamethrin is a form of Pyrethrum so should be okay.