When I lived in Phoenix area it was rare to see bugs, not many bugs in the desert. Certain time of the year invisible bugs would eat certain garden plants. Plants were fine at sun down but next morning at sun rise something ate some of the plant leaves middle of the night. It has to be a bug that only comes out after dark.
Only bugs I ever saw was stink bugs on squash and millions of micro small bugs gray on the Brussels sprouts. I tried a flashlight after dark, also tried a black light after dark never saw any bugs after. There are Bats & scorpions after dark but I don't think they eat plants.
My best Arizona garden was planted in November no freezing weather until 2 weeks in February. Broccoli, swiss chard, napa cabbage big as water melons, they all grew very well with 10 minutes of irrigation at 9pm every night = 1 pint of water per plant, all winter. Tomatoes barely have time to make fruit i kept the plants covered when it frosted if there was no freeze tomatoes survived until June. Best crop of melons i ever grew was in AZ planted in March. Onions and garlic did excellent growing all winter Oct to May. Bell peppers, beans, squash, all do good planted Nov 1st. Herbs were so easy to grow there was nothing to do except eat them.
There is a good farm supply store on 202 at Glendale exit that sells garden plants at a reasonable price, also do it yourself pet shots $7 better than $50 at Petsmart. Lowe's & Home depot want $5 per plant that is crazy over priced. Ace hardware sells pet shots too.
AZ soil & water are both 8 ph. AZ soil needs Lime I had a problem with BER in tomatoes, melons, peppers, squash, wood ash & cement was the only lime I could find in AZ.