Question
my pepper plants have holes in them, and my radishes have just came up and something ate them,but did not touch the lettuce.what could that be? what should i use to keep them healthy.    thank you

Answer
From the description you gave, it could be almost anything.  But if I were to venture a guess based on the time of year, it would be slugs.

I, too, have had many heartaches over the damage slugs have done to my plants over the years.  I have tried everything including beer traps, diatomaceous earth, homemade traps, and copper.  I must admit that I've had moderate success with the beer, but it would evaporate each day and got expensive to maintain.

I am happy to say that I've finally discovered an effective deterrent.  It is an iron phosphate product sold by a company named Gardens Alive, and is called Escar-Go.  Although it is a pesticide, it is organic, and is therefore non-toxic to humans and pets.  It also stays active and solid even after a heavy rain.  Just sprinkle small amounts around each plant, and reapply every 10 days.  In case you're interested, click on the attached website and search for Escar-Go.

http://www.gardens-alive.com

If the area is large, making this product impractical, try spraying the soil with an ammonia solution.  Mix one tbs. lemon ammonia and one tbs. of non-concentrated dishwashing liquid per gallon of water. You'll need to apply this solution twice per week, and preferably in the early morning
hours when slugs are most active.

I hope this helps.  Good luck, and have a great weekend.

Regards,

Mike